Jobs

About Tie

Tie is building the next generation of identity resolution and marketing intelligence. Our platform connects hundreds of millions of consumers across devices, browsers, and channels—without relying on cookies—to power higher deliverability, smarter targeting, and measurable revenue lift for modern marketing teams.

At Tie, AI is not a feature—it is a core execution advantage. We operate large-scale identity graphs, real-time scoring systems, and production ML pipelines that directly impact revenue, deliverability, and customer growth.

The Role

We are looking for detailed-oriented  AQA Engineer. This person is responsible for validating the quality of our software through thorough exploratory, functional, and regression testing. This person is analytical, proactive, and passionate about delivering high-quality user experiences.

Technical Responsibilities

• Review requirements, user stories, and design documents to create detailed and comprehensive test cases and checklists
• Perform functional, integration, UI/UX, and regression testing across web, data, 3d party apps and/or API layers.
• Test on multiple browsers, devices, and screen resolutions to ensure cross-platform consistency
• Execute manual test cases and report issues with clear reproduction steps and severity levels
• Verify fixes and perform retesting and smoke testing
• Maintain test case repositories (e.g., TestRail, Zephyr, Xray, etc.)
• Perform basic API testing using tools like Postman
• Use developer tools (e.g., Chrome DevTools, browser console) to investigate issues
• Track and manage bugs using tools like Jira
• Support release validation in redesign, staging and production environments or any other required.
• Collaborate with developers and product managers to ensure test coverage and align QA efforts with release goals
• Collaborate with business, customer success to ensure the test coverage and align QA efforts with business goals.

Automation & AQA Responsibilities

• Develop and maintain automated test suites for UI and API layers using frameworks like Playwright, Cypress, or Selenium
• Integrate test automation into the CI/CD pipeline to enable fast and reliable deployments
• Prioritize what to automate based on risk, stability, and ROI, complementing manual testing
• Validate data flows and transformation logic in data-driven applications by writing automated assertions against APIs and backend responses
• Build reusable utilities and selectors to support robust and maintainable test scripts
• Work closely with developers to ensure testability and coverage of edge cases
• Use version control (e.g., Git) and test reporting tools (e.g., Allure, TestNG reports) to ensure traceability
• Support debugging and root cause analysis by capturing logs, screenshots, and network traces during test execution
• Maintain a hybrid approach, knowing when to use exploratory/manual testing alongside automation to uncover UI/UX or logic-related issues

Data-Driven Application Testing

• Validate the accuracy, completeness, and integrity of data throughout the user journey
• Perform data validation across frontend, backend, and database layers, including comparing displayed data with source systems or API responses
• Ensure business rules and data logic are correctly applied (e.g., filters, transformations, aggregations)
• Test the impact of edge cases and malformed data inputs on application behavior
• Perform SQL-based verification (or through data exports) to confirm data correctness, where applicable
• Validate data syncing between systems, especially in applications that consume or expose third-party data via APIs
• Monitor how updates to records, entries, or data states reflect across the application (e.g., state transitions, user-based data visibility)

Non-Technical Responsibilities

• Participate in daily stand-ups, sprint planning, and retrospectives to represent QA priorities
• Communicate bugs and quality concerns clearly to cross-functional teams
• Proactively raise red flags if requirements are unclear, incomplete, or inconsistent
• Help define and improve QA processes, checklists, and acceptance criteria
• Collaborate with product and design teams to ensure test scenarios reflect user expectations
• Own the quality mindset for the features being delivered
• Provide feedback on usability and suggest improvements from a user perspective
• Maintain a clear audit trail of testing progress and coverage
• Be a champion for documentation, keeping test plans and QA procedures up to date
• Collaborate with QA Team Lead in providing feedbacks and reviews of QA strategies, processes, practices.

Working in Ambiguous and Fast-Paced Environments

• Confidently test features with minimal or evolving specifications, using exploratory testing and product intuition to uncover edge cases
• Collaborate closely with developers, product managers, and other stakeholders to clarify intent and co-create acceptance criteria when missing
• Document findings, gaps, and assumptions clearly to reduce miscommunication and improve team alignment
• Adapt quickly to frequent changes in priorities or scope, while ensuring quality is not compromised
• Use structured approaches to test loosely defined features, such as session-based test charters or heuristic checklists

• Maintain composure and clear prioritization even during high-pressure releases, rollbacks, or urgent hotfixes

   

Requirements

Technical

• 5+ years of manual testing experience for web applications
• 2+ years of automation testing experience(Playwright or Cypress must have(JS/TS))
• Strong understanding of Agile methodologies, specifically Scrum and Kanban
• Familiarity with bug tracking and test case management tools(QASE, Testomat, TestRail, etc.)
• Experience testing REST APIs (even at a basic level)
• Experience with Data verifications

• Ability to test across various browsers and responsive breakpoints

  As a plus:

• Experience with AI in both automated tests and day2day work will be a plus(Claude.ai)

Non-Technical

• Detail-oriented mindset and strong analytical thinking
• Clear and concise communicator in both written and verbal form, English.
• Proactive communication cros-team
• Comfortable working in fast-paced, changing environments
• Ability to manage time and tasks independently

• Proactive attitude and a sense of ownership for quality

   

What We Offer

• Competitive compensation, including salary, equity, and performance incentives
• Opportunity to work on core AI systems that directly impact revenue and product differentiation
• High ownership and autonomy in a senior, hands-on role
• Remote-first culture with a strong engineering and data focus
• Exposure to cutting-edge problems in identity resolution, graph ML, and real-time AI systems

• Clear growth path toward Staff / Principal IC roles

  What else:

• 4 weeks of paid vacation per year (flexible scheduling)
• Unlimited sick leave — we trust your judgment and care about your health
• US Bank Holidays off (American calendar)
• Remote-first culture and flexible working hours
• Flat structure, no micromanagement, and full ownership

• Opportunity to make a real impact during a critical growth phase

   

  Interview Process

• Recruitment Screening Call
• Test task in HackerRank for 1h
• Technical deep dive Interview (1,5h)

• Final interview with CTO in English

   

  Why Join Us?

• High-impact delivery leadership role during a critical period
• Real ownership and autonomy
• Opportunity to shape delivery across the entire engineering organization
• Exposure to SaaS, data, integrations, automation, and platform work
• Collaboration with global teams and vendors

• A strong product with real scale and momentum

   

Why This Role Matters

At Tie, your work will not live in notebooks or experiments—it will power production systems used by real customers at scale. You will help define how AI is embedded into the company’s core platform and play a key role in making machine learning a durable competitive advantage.

We're hiring a Senior Software Engineer to join us for a long-term engagement with a fast-growing UK travel tech client. The role focuses on owning and evolving their production document AI pipeline (OCR plus ML inference on passport and ID documents, CPU only deployment, no GPU).

This is hands-on production engineering, not research. You'll be improving OCR accuracy, optimizing CPU inference (INT8 quantization, ONNX Runtime, batching), refactoring pipeline complexity, and improving observability of a system serving enterprise clients at scale.

What you'll do:

• Take ownership of the existing OCR and document understanding pipeline in Python
• Optimize ML inference for CPU production (ONNX Runtime, quantization, batching, kernel tuning)
• Improve OCR accuracy, latency, throughput, and memory efficiency
• Refactor architectural complexity and reduce technical debt
• Work across ML systems, backend services, APIs, and data pipelines
• Help shape architectural decisions as the platform scales

Required:

• 5 plus years of professional Python software engineering
• Strong experience with OCR and document processing pipelines
• Familiarity with LayoutLMv3, Doctr, PaddleOCR, EasyOCR, Donut, or DocFormer
• Production ML systems experience (not just notebook experimentation)
• ONNX Runtime, quantization, TorchScript, or related CPU inference optimization
• Strong understanding of PDFs, image preprocessing, bounding boxes, and page segmentation
• Experience with systems serving external customers at scale

Nice to have:

• HuggingFace Transformers production experience
• Enterprise SaaS or aviation/travel tech background
• MLflow, Vertex AI, or similar ML operations tooling
• Distributed systems and backend API design experience

Engagement:

• Fully remote
• Long-term (6 plus months) with potential to expand engineering ownership over time
• Part-time (25-30 hrs/week) or full-time (35-40 hrs/week), depending on candidate availability
• Flexible timezone (engagement requires some overlap with UK working hours)

How to apply:
Send a short note covering relevant OCR / document AI work, production ML systems you've shipped, CPU inference optimization experience, GitHub or LinkedIn, current availability, and timezone.

Infozahyst is a Ukrainian scientific and production center that has been developing software and hardware solutions for Ukraine’s security and defense forces for over 20 years.
We are engineers, analysts, and researchers united by a common goal: to create technologies that ensure Ukraine’s security.

Requirements: 

• 8+ years of professional C# / .NET, 4+ years in a Senior, Tech Lead or Architect role with cross-team
scope.
• Deep knowledge of the CLR (memory model, GC, JIT, allocation patterns, finalization) and core C#
(generics, LINQ, expression trees, async/await internals, synchronization contexts, etc).
• Working knowledge of modern C# (8+): pattern matching, nullable reference types, records,
switch expressions, etc.
• Practical experience with .NET Framework → modern .NET migrations.
• Strong expertise in WPF (MVVM) and data-intensive desktop applications: virtualization, binding
cost, Freezable, Dispatcher patterns, custom controls and ControlTemplate, high-DPI and screen
scaling, UI Automation.
• Solid experience with multithreading: TPL, TPL Dataflow, synchronization primitives, lock-free
patterns, ThreadPool tuning.
• Experience building applications that process real-time streaming data from devices, sensors, or
network endpoints.
• Solid understanding of network programming: TCP/UDP, binary protocols, framing, backpressure,
reconnect logic.
• Hands-on experience with low-allocation patterns and SIMD in .NET: Span<T>, Memory<T>,
ArrayPool<T>, System.Numerics.Vector<T>, hardware intrinsics.
• Strong database skills: MS SQL Server, T-SQL, execution-plan analysis, EF Core, Dapper.
• Strong grasp of software design and architectural review: SOLID, GRASP, DDD, separation of
concerns, clean architecture, design patterns, focus on maintainability, testability, performance.
• Solid foundation in algorithms and data structures: big-O notation, collections trade-offs, graph
and dynamic-programming techniques where applicable to signal-processing tasks.
• Experience with profiling and diagnostics: dotTrace, dotMemory, Visual Studio Profiler, ETW /
PerfView, BenchmarkDotNet.
• Hands-on experience with unit / integration testing (including TestContainers), CI/CD pipelines,
quality gates.
• Proficient with Git and modern branching / code-review practices.
• Track record of horizontal expert work: setting standards, cross-team reviews, mentorship,
ownership of domain artifacts (competency matrix, tech radar, coding standards, lessons learned,
etc).
• Experience as an independent technical evaluator in hiring and Performance Review.
• Excellent communication and mentoring, able to defend technical positions in writing and in
discussion.
• English: B2 or higher.

Preferred Skills:

• DSP fundamentals: FFT, windowing, FIR / IIR filtering, spectral analysis, I/Q data.
• Radio engineering and SDR: modulation types, channel and noise models, baseband vs passband,
link-budget analysis, SDR architecture and sample-streaming interfaces.
• GPGPU (CUDA, OpenCL, ILGPU) for signal-processing workloads.
• Native interop in .NET: P/Invoke and C++/CLI for performance-critical code and hardware
integration.
• Public technical activity: articles, conference talks, open-source contributions, etc.
• Agile (Scrum / Kanban) with release-based planning.

Key Responsibilities:

• Co-own the .NET competency matrix and domain tech radar with the Head of Engineering
Excellence Center.
• Author coding standards, review templates, checklists and reference solutions contributing deep
cross-domain expertise.
• Build and run internal enablement: lectures, workshops, mentorship.
• Provide expert consultation and architectural review across projects.
• Drive root-cause analysis of complex defects across .NET projects.
• Define release-readiness criteria within the domain.
• Design and run technical interviews, calibrate ratings across interviewers.
• Act as independent technical evaluator in Performance Review, support IDP design.
• Support pre-sale (assumptions, risks, recommendations), contribute to Project Brief and Project
Cost without owning delivery.
• Surface project problems suitable for a research track and hand them to the Head of Research
Programs.
• Represent the domain externally (articles, talks, meetups, recruiting brand, etc).

Benefits:

• Employment in a stable and reliable company;
• Working remotely, but available to visit office in Kyiv once a month;
• Competitive salary;
• A 5-day work week with an 8-hour workday within the 9:00–20:00 time window;
• Support for personal and professional growth, including opportunities for training and reimbursement of its cost;
• Care for employee health through medical insurance, 18 working days of paid vacation, and sick leave coverage;
• Openness to new ideas and approaches, with healthy communication within the team;
• Unique and exciting projects;
• Involvement in a mission that brings us closer to victory!

Dear candidates, we will review your resume within 10 business days, and if the decision is positive, we will definitely contact you. If you do not receive feedback from us, it means that we are not ready to offer you this position at the moment.

We’re looking for a Senior Engineer who thrives on unfamiliar problems — someone who can land in a customer’s environment, reverse-engineer poorly-documented vendor APIs, and ship a working integration end-to-end, solo.

What makes you a great fit:

• 5+ years of professional software development experience, including 3+ years of hands-on experience in Python.
• Proven track record in designing and building integrations against third-party REST APIs.
• Comfortable working in unfamiliar codebases and picking up new stacks as engagements demand.
• Upper-intermediate written and spoken English.
• Self-managed in an async remote setting — strong ownership, communication, and time management.
• Curiosity and dive-deep mentality — comfortable when documentation is incomplete or absent.

• AI-as-tool fluency — productive use of Claude code, Copilot, Cursor, or similar for research and implementation.

   

Will be a plus:

• Prior customer-facing engineering experience (joining technical calls, gathering requirements).
• Familiarity with security products (SIEM, EDR, vulnerability management, threat intel, firewalls, etc.).

• Experience working in or alongside a SOC.

   

Why work with us?

• People-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• 29 days of PTO (18 working days per year, plus all national holidays)
• 10 paid recovery days
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers

• Dedicated HR support

   

Your day-to-day in this position:

• Design and build bespoke integrations between our products and customer-specific security stacks — primarily in Python, occasionally in whichever stack the engagement demands.
• Tackle the hardest integration problems: the non-conventional, “out-of-the-books” engagements that standard product connectors can’t cover.
• Own each engagement end-to-end — discovery and technical scoping through implementation, testing, and handover.
• Join customer technical calls alongside PM/CSM to sharpen requirements; drive written follow-up between sessions.
• Reverse-engineer poorly-documented vendor APIs and build robust integrations against them.

• Capture learnings from each engagement and feed them back to the product and integration teams so the next engagement is easier.

   

What is your new project?

• Domain: Computer and network security
• Location: Israel
• Company size: 51-200 employees
• Founded in: 2009
  
  Our next steps:

✅ Intro call with a Recruiter — ✅ Tech livecoding interview — ✅ Tech theoretical + system design interview — ✅ Managerial interview — ✅ HR client interview — ✅ Reference check — ✅ Offer

Are you eager to take ownership of a portfolio of complex, high-impact projects? Do you excel at executive-level stakeholder management and driving results in dynamic environments? We have a great opportunity to make a real impact.

We are looking for a self-motivated, results-driven Senior Project Manager with strong leadership skills to oversee the delivery of existing projects and lead the launch of new initiatives.

You will join our Department, which is rapidly growing in competencies, projects, customers, and professionals. We are excited to grow and evolve together with you.

CUSTOMER

We partner with global customers to deliver cutting-edge solutions in enterprise software. We focus on high-value, large-scale projects that require adaptability, technical excellence, and strong stakeholder engagement.

PROJECT

You will manage a portfolio of existing projects and lead the initiation of new ones across different domains. Current teams consist of experienced professionals already engaged with customers, and the department has ambitious expansion plans. Projects vary in scope and require expertise in multiple methodologies.

Responsibilities:

• Lead planning, execution, and delivery of multiple projects within scope, time, and budget
• Establish and maintain effective delivery supervision across the portfolio
• Build and manage project teams, fostering collaboration and growth
• Select and adapt project management methodologies to fit project needs
• Identify, assess, and mitigate risks proactively
• Maintain accurate project documentation and reporting for stakeholders
• Communicate closely with customers to manage expectations and support business development
• Coordinate resources, delegate tasks, and monitor progress
• Resolve conflicts and promote a high-performance team culture
• Utilize project management tools to ensure transparency and progress tracking

Requirements:

• 5+ years of experience in project and/or program management
• Experience with public sector or government projects
• Experience with fixed-price projects
• Strong understanding of project, program, and portfolio management concepts
• Hands-on experience with Agile, Scrum, Waterfall, and hybrid methodologies
• Proven leadership skills with ability to motivate and guide teams
• Strong risk management, planning, and decision-making skills
• Experience with project management tools (e.g., Jira, MS Project, Microsoft tools)
• Excellent communication, presentation, and stakeholder management skills
• Strong organizational, negotiation, and conflict resolution capabilities
• Ability to adapt quickly to changes and manage complexity
• Advanced understanding of corporate environments and business objectives
• Upper-Intermediate or Advanced English level

Чи прагнете ви взяти на себе відповідальність за портфель складних, високоефективних проєктів? Чи маєте ви досвід управління взаємодією зі стейкхолдерами на рівні топменеджменту та досягнення результатів у динамічному середовищі? Ми пропонуємо чудову можливість зробити реальний внесок.

Ми шукаємо самомотивованого, орієнтованого на результат Senior Project Manager з сильними лідерськими навичками для управління реалізацією поточних проєктів і запуску нових ініціатив.

Ви приєднаєтеся до нашого департаменту, який стрімко зростає за напрямами компетенцій, кількості проєктів, клієнтів та фахівців. Ми раді зростати та розвиватися разом із вами.

КЛІЄНТ
Ми співпрацюємо з глобальними клієнтами, надаючи передові рішення у сфері корпоративного програмного забезпечення. Ми зосереджуємося на високовартісних, масштабних проєктах, що потребують гнучкості, технічної досконалості та ефективної взаємодії зі стейкхолдерами.

ПРОЄКТ
Ви керуватимете портфелем поточних проєктів та очолюватимете ініціацію нових у різних доменах. Поточні команди складаються з досвідчених фахівців, які вже співпрацюють із клієнтами, а департамент має амбітні плани щодо розширення. Проєкти різняться за масштабом і потребують досвіду роботи з різними методологіями. 

Обов'язки:

• Керувати плануванням, виконанням та доставкою кількох проєктів у межах визначених термінів, бюджету та обсягу
• Забезпечувати ефективний контроль доставки по всьому портфоліо
• Формувати та управляти командами проєктів, сприяючи співпраці та розвитку
• Обирати та адаптовувати методології управління проєктами відповідно до потреб
• Виявляти, оцінювати та проактивно мінімізувати ризики
• Вести точну проєктну документацію та звітність для стейкхолдерів
• Тісно комунікувати із замовниками, керувати їхніми очікуваннями та підтримувати розвиток бізнесу
• Координувати ресурси, делегувати завдання та контролювати прогрес
• Вирішувати конфлікти та підтримувати культуру високої продуктивності в команді
• Використовувати інструменти управління проєктами для прозорості та відстеження прогресу

Вимоги: 

• 5+ років досвіду в управлінні проєктами та/або програмами
• Досвід роботи з проєктами державного сектору або урядовими проєктами
• Досвід роботи з проєктами з фіксованою ціною
• Глибоке розуміння концепцій управління проєктами, програмами та портфоліо
• Практичний досвід роботи з Agile, Scrum, Waterfall та гібридними методологіями
• Доведені лідерські навички та вміння мотивувати й спрямовувати команди
• Сильні навички управління ризиками, планування та прийняття рішень
• Досвід роботи з інструментами управління проєктами (наприклад, Jira, MS Project, Microsoft tools)
• Відмінні комунікаційні, презентаційні та навички управління стейкхолдерами
• Сильні організаційні, переговорні та навички вирішення конфліктів
• Здатність швидко адаптовуватися до змін та працювати в умовах складності
• Просунутий рівень розуміння корпоративних середовищ та бізнес-цілей
• Рівень англійської - Upper-Intermediate або Advanced 

📍 Location: EU only
🕒 Full-time | Long-term project (initially 6 months+)
🕘 Working hours: 9:00–18:00 CET
 

We’re looking for a strong Senior NLP & Python Developer to join an innovative AI-powered healthcare product focused on clinical trial automation and protocol intelligence.

The product is a next-generation Clinical Trial Management System (CTMS) that uses AI to analyze complex medical protocols (100–400+ page documents) and transform them into structured, executable workflows for research sites and clinical operations teams.

You’ll work on advanced NLP/RAG pipelines, scalable backend architecture, and AI systems that must meet strict healthcare compliance and auditability requirements.

What you’ll work on

• Designing and optimizing RAG pipelines for medical protocol parsing
• Building AI-powered extraction systems using LangChain, LangGraph, LLMs, and VLMs
• Improving AI traceability, reproducibility, and deterministic outputs
• Developing scalable backend services with FastAPI and PostgreSQL
• Working with vector databases (pgvector) and embedding pipelines
• Implementing document classification and extraction workflows
• Enhancing observability, validation, monitoring, and testing
• Supporting validation-ready and compliance-oriented architecture
• Improving performance and scalability of AI/ML infrastructure

Tech Stack

• Python 3.14
• FastAPI
• SQLModel / SQLAlchemy / Pydantic v2
• PostgreSQL + pgvector
• LangChain / LangGraph
• Docker / Docker Compose
• Celery
• Redis
• RabbitMQ
• NLP / LLM / VLM pipelines

Requirements

• 5+ years of commercial Python development experience
• Strong experience with FastAPI and SQLAlchemy
• Deep knowledge of PostgreSQL (schema design, indexing, optimization)
• Experience with Docker and microservice architecture
• Hands-on experience with LangChain and RAG systems
• Experience with vector databases (preferably pgvector)
• Strong understanding of embeddings, prompt engineering, and AI orchestration
• Experience with Celery, Redis, RabbitMQ
• Practical experience with document extraction / NLP systems
• Experience working in regulated industries (healthcare, fintech, life sciences, etc.)
• Strong architectural and system-design mindset
• Upper-Intermediate+ English

Nice to have

• Experience with GxP or healthcare-compliant AI systems
• Experience with AI explainability and auditability
• Familiarity with Ruff, Poetry, pre-commit hooks
• Experience scaling AI-heavy platforms

Team

You’ll collaborate with:

• ML Architect
• Senior ML/Python Engineer
• Frontend Engineer
• QA Engineer
• BA & PM

This is a high-impact role where you’ll directly influence the architecture of a complex AI healthcare platform.

📩 If you have strong Python + NLP/RAG expertise and want to work on meaningful AI systems in healthcare — apply now.

Senior Python Engineer (AI-driven Recommendation Platform, iGaming domain)

About the Product

We are developing an AI-powered performance optimization platform for online casinos and sportsbooks. The solution helps operators improve key business metrics by increasing player engagement and loyalty through personalized recommendations and predictive analytics.

The platform collects and processes player behavior data across multiple systems, builds detailed user profiles, and generates actionable insights, including:

• identifying players who misuse bonus programs without long-term retention
• detecting patterns of risky or excessive gaming to support responsible play
• recommending relevant games and activities based on user preferences and behavioral history

You will join a team building scalable recommendation systems, working with large volumes of data, and implementing ML-driven personalization to enhance user experience within iGaming products.

Requirements

• 5+ years of backend development experience with Python
• Strong foundation in mathematics, statistics, or computer science
• Hands-on experience with FastAPI, Django, or Flask
• Solid knowledge of data structures, algorithms, and distributed systems
• Experience with SQL and NoSQL databases (PostgreSQL, Redis, DynamoDB, MongoDB, etc.)
• Practical experience with Kafka or RabbitMQ and asynchronous architectures
• Cloud experience with AWS (Lambda, S3, RDS, SQS, etc.)
• Experience designing and maintaining high-load, scalable systems
• English level — B2 or higher

Nice to Have

• Experience with recommendation systems, data analysis, or ML-based personalization
• Understanding of data pipelines and ETL processes
• Experience with Kubernetes, Docker, and CI/CD pipelines
• Familiarity with Elasticsearch and monitoring/visualization tools (Grafana, Kibana)

Responsibilities

• Design and develop scalable backend services for AI-powered recommendation systems
• Collaborate with data scientists and ML engineers to deploy models into production
• Optimize data storage, processing, and retrieval for large-scale user datasets
• Ensure system reliability, performance, and scalability
• Take part in architectural discussions, code reviews, and mentoring
• Contribute to new features aimed at increasing player engagement and retention

Tech Stack

Python, FastAPI, Django, Flask, Kafka, RabbitMQ, PostgreSQL, Redis, DynamoDB, AWS (Lambda, S3, RDS, API Gateway, CloudWatch), Kubernetes, Pandas, NumPy, SQLAlchemy, Celery, Elasticsearch, Prometheus, Grafana.

Domain: iGaming / Gambling
Format: Product company
Experience: 5+ years

About the Company

We are an international product company operating in the gambling sector. Our platform delivers real-time personalization for casino and sportsbook products using advanced machine learning. The solution processes live behavioral, transactional, and contextual data to improve player engagement, retention, and overall performance for operators worldwide.

Our focus is on building production-grade ML systems that directly influence what users see in real time — from game recommendations to personalized content and promotions.

Role Overview

We are looking for a Senior Data Scientist to join a product-focused team working on real-time personalization and recommendation systems for iGaming platforms.

This is a hands-on role that combines modeling, experimentation, and close collaboration with engineering and product teams in a high-load, real-time production environment.

Main Responsibilities

• Develop ML-driven features for casino products using supervised learning (regression, ranking, classification)
• Maintain and improve existing recommendation systems in production
• Enhance models using gradient boosting and other supervised approaches
• Perform data cleaning, preprocessing, and feature engineering
• Design and maintain pre- and post-processing workflows
• Optimize training and inference pipelines for performance and reliability
• Integrate ML models into Airflow pipelines in a multi-tenant environment
• Adapt and configure the solution for different clients (tenants)
• Collaborate closely with product and engineering teams on experimentation and feature delivery

As Part of the Team You Will

• Work cross-functionally with data scientists, engineers, product owners, designers, and researchers
• Analyze large-scale datasets to extract insights for product and business decisions
• Propose, implement, and evaluate ML approaches to solve real business problems
• Support and evolve a recommendation solution used across multiple tenants
• Influence product strategy through research, experimentation, and data-driven insights into user behavior

Experience & Education

• 5+ years of professional experience in data science
• Degree in a quantitative field (Mathematics, Statistics, Computer Science, or similar)

Core Skills

• Strong proficiency in Python and SQL
• Hands-on experience with data processing tools (Pandas, Polars)
• Solid engineering skills for building and maintaining scalable ML systems
• Experience implementing observability in ML pipelines (metrics, logging, alerting)
• Knowledge of Docker and Kubernetes
• Strong analytical mindset with the ability to solve loosely defined problems
• Hands-on experience with supervised ML techniques, including:
  • Regression and ranking models (XGBoost, LightGBM, CatBoost, neural networks)
  • Feature engineering and model evaluation (AUC, NDCG, MSE, uplift metrics)
  • Personalization or recommendation systems
• Proven experience deploying ML models to production (near real-time or batch)
• Solid understanding of statistical methods (A/B testing, significance testing)

Nice to Have

• Production experience with large-scale recommendation systems
• Experience with Airflow, Valkey/Redis, FastAPI in production
• Familiarity with contextual bandits or reinforcement learning
• Experience with AutoML tools

test task +1 tech interview + final cultural fit interview

"AQA - 5+ years (expert-level proficiency in JavaScript as the primary scripting language; working knowledge of Python or Java is a strong plus.)
deep, hands-on expertise with WebdriverIO (WDIO) as the primary automation framework. Experience with additional frameworks such as Cypress, Appium, Playwright, or similar is highly valued
proficiency with API testing tools such as Postman, REST Assured, or similar"

Required Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or a related technical field (or equivalent practical experience).
• 6+ years of professional experience in software quality assurance, with a strong focus on test automation.
• Expert-level proficiency in JavaScript as the primary scripting language; working knowledge of Python or Java is a strong plus.
• Deep, hands-on expertise with WebdriverIO (WDIO) as the primary automation framework. Experience with additional frameworks such as Cypress, Appium, Playwright, or similar is highly valued.
• Hands-on experience leveraging AI-powered testing tools and AI-assisted development tools to accelerate test creation, maintenance, and defect detection.
• Solid understanding of software testing methodologies across functional, regression, integration, performance, API, and end-to-end testing.
• Proficiency with API testing tools such as Postman, REST Assured, or similar.
• Experience integrating automated tests into CI/CD pipelines.
• Strong working knowledge of version control systems (Git).
• Excellent command of the English language, speaking, listening, reading, and writing, as this is an international company and English is the primary language of communication and documentation.

Preferred Qualifications

• Experience with performance and load testing tools (Locust, JMeter, k6, Gatling).
• Familiarity with containerization and cloud platforms (Docker, Kubernetes, AWS, Azure, or GCP).
• Experience testing AI/ML-based applications, including model output validation and prompt-based testing strategies.
• ISTQB or equivalent QA certification.

Nice to Have

• Familiarity with security testing fundamentals, including common vulnerabilities (e.g., OWASP Top 10), authentication/authorization testing, and secure API testing practices.
• Hands-on experience with web proxy and security testing tools such as Burp Suite, OWASP ZAP, Charles Proxy, or Fiddler for traffic inspection, request manipulation, and vulnerability discovery.

Core Competencies

• Excellent analytical and problem-solving skills with strong attention to detail.
• Proven ability to mentor junior engineers and drive quality standards across teams.
• Strong written and verbal communication skills in English, with the ability to clearly document test strategies, results, and defects, and to collaborate effectively with cross-functional, distributed teams.
• Ownership mindset and the ability to operate independently in a fast-paced, international environment.

We are looking for a Software Engineer with strong backend expertise to strengthen our engineering team at a successful web project from the USA.

As a Software Engineer, you will contribute to building and enhancing the platform within a collaborative engineering team. While the current stack includes Angular and Node.js, the strategic goal is to expand backend capabilities and strengthen collaboration with engineering and ETL teams.

Depending on project priorities, you may initially focus on Angular/Node.js features, while gradually contributing more to backend services and integrations, where .NET/C# experience will be valuable. You should be comfortable working across the stack when needed.

Our ideal candidate:

• Is comfortable working across both frontend and backend when needed
• Brings strong backend engineering experience
• Can help increase the technical seniority of the team
• Is proactive and capable of contributing to technical direction and system design
• Demonstrates strong ownership and problem-solving skills
• Is collaborative, comfortable working in ambiguous environments, able to mentor others, and raise the overall technical maturity of the team

Requirements

Must have

• 5+ years of professional software development experience.
• Strong experience in backend development.
• Hands-on experience with Node.js and Angular.
• Previous or current experience with .NET / C#.
• Experience designing and implementing backend services or APIs.
• Strong problem-solving skills and the ability to work with complex systems.
• Upper-Intermediate English (B2+) or higher.
• Proactive mindset and ability to take ownership of technical solutions.

Will be a plus

• Experience with AWS or other cloud platforms
• Experience working with healthcare systems or regulated environments
• Experience with SQL and/or NoSQL databases (e.g., MySQL, MongoDB)
• Mentorship or technical leadership experience

Responsibilities

• Develop and maintain features using Angular and Node.js (Express).
• Contribute to backend services and system architecture where applicable.
• Strengthen the team's backend expertise and engineering maturity.
• Collaborate with engineering and ETL teams on integrations and data-related workflows.
• Participate in architecture discussions, code reviews, and technical decision-making.
• Identify opportunities to improve system scalability, reliability, and maintainability.
• Share knowledge and support other engineers when needed.

About Project

Our client is a Software company from the USA.

Product

This platform is dedicated to ensuring payment integrity for health payers. Our project focuses on creating and implementing cutting-edge technology solutions to tackle current and future challenges in the healthcare industry for health plans. By bringing together payers, providers, and business partners on one technology platform, we aim to facilitate transparent communication and support collaboration.

Stage

Active phase of development

Project team

Existing team on the client side. We work with the US team (Eastern and Central time zones) — around 10 people. Our team is 17 people (9 MEAN stack developers, 8 QA, 1 PM)

Project Technologies

MEAN (MongoDB, Express. js, Angular and Node.js)

Work schedule

Full-time working day (flexible hours), possibility to work remotely or visit our offices in Lviv, Kyiv or Krakow.

Interview Stages

1-st stage — Call with Recruiter (30 minutes)
2-nd stage — Interview with our Senior Engineer (1 hour)
3-rd stage — Client interview

Lime Vizio
Product: High-volume e-commerce (US / Canada)
Format: Remote, full-time
Timezone: Los Angeles time (PST / PT)

About the role

We are looking for a COO who owns operations and profit, not just processes.

This role is about turning a complex, high-volume eCommerce business into a predictable, scalable, and margin-driven system.

You will be responsible for fixing operational inefficiencies, structuring execution, improving unit economics, and building systems that scale without chaos.

Responsibilities

• Own end-to-end operations across the business
• Drive EBITDA growth and improve unit economics
• Reduce cost per order, refunds, cancellations, and inefficiencies
• Redesign core operational flows (order → routing → fulfillment → resolution)
• Build structured systems, ownership, KPIs, and SLAs
• Replace manual work with automation and AI-driven workflows
• Improve execution stability and fulfillment predictability
• Scale operations 2×+ without proportional cost increase
• Work directly with CEO on priorities, trade-offs, and execution

Requirements

• Strong eCommerce experience is mandatory (high-volume operations)
• 8+ years in COO / operations / systems / strategy roles
• Proven experience scaling operations 2×+
• Strong understanding of unit economics and profitability drivers
• Experience building and optimizing systems (not just managing teams)
• Hands-on experience with automation and AI tools
• Experience with remote/distributed teams
• Ownership mindset and strong decision-making ability

Not a fit if

• you’ve never worked with high-volume eCommerce
• you can’t explain unit economics clearly
• you manage processes but don’t fix systems
• you avoid ownership or decision-making
• you rely on manual work instead of building systems

Nice to have

• Marketplace / aggregator model experience
• Experience managing peak seasons (Valentine’s Day, etc.)
• BI / dashboards / financial modeling
• Experience scaling vendor networks

What we offer

• Remote, long-term cooperation
• Direct impact on revenue and profitability
• Full ownership of operations
• Fast decision-making, low bureaucracy
• Opportunity to rebuild and scale systems

Required skills

• Operations Management — 5+ years
• eCommerce — 3+ years
• Unit Economics — 3+ years
• Process Optimization — 5+ years
• Automation / AI — 2+ years

Language

• English — B2+ (Upper-Intermediate or higher)

About Lime Vizio

Lime Vizio is a product-driven e-commerce company operating in the floral and gifting industry across the United States and Canada.

We build and manage high-volume platforms that connect customers with local florists and delivery partners. Our focus is on conversion, operational efficiency, and reliable execution — especially during time-sensitive moments like Valentine’s Day and Mother’s Day.

We operate as a remote-first team with strong ownership, data-driven decisions, and clear accountability.

Who We Are

At Bennett Data Science, we've been pioneering the use of AI, predictive analytics, and data science for over a decade for some of the biggest brands and retailers. We're at the top of our field because we focus on delivering actionable AI for our clients. Our deep experience and product-first attitude set us apart from other groups and gets us the business results our long-term clients want.

Why You Should Work With Us

You'll be exposed to a wide range of clients who are at the cutting edge of innovation in their field and get to work on fascinating problems, supporting real products, with real data. We help lots of companies, from some of the largest companies in the world to small startups in Silicon Valley who are building the next big thing.

About

We are hiring for a remote applied AI consulting firm that builds production AI systems for clients. The company works on real business workflows, private data, and deployed software. The team is small, senior, and focused on systems that survive production use. The company values clear ownership, strong engineering judgment, and direct communication.

The role

You will own a reusable agent platform that powers every agentic client engagement. The platform will cover orchestration, tool calling, retrieval, evaluation, deployment, monitoring, and common data connectors. You will take the current foundation forward and make it stable, documented, and easy for other engineers to use. You will make key architecture choices and keep the system simple enough to extend across different client environments. You will work closely with senior engineers who adapt the platform to client workflows.

You will:

• deliver a scalable agentic platform from early prototypes to a deployable, sellable product
• build the core services that let agents plan work, use tools, retrieve data, and complete tasks safely
• apply proven practices for reliability, security, monitoring, cost control, and recovery
• create clear ways to test quality, review production behavior, and improve the platform based on real usage
• make the platform easy to deploy, operate, and adopt across client environments
• write clear guidance for engineers who build on the platform.

Required:

• LangGraph in production is essential. You have designed, shipped, and maintained LangGraph graphs in production: state management, checkpointing, multi-agent orchestration, and human-in-the-loop interrupts
• 7+ years shipping production software, with at least 2 years on LLM-powered systems running in production (not an internal tool)
• Strong Python. Comfortable with FastAPI or equivalent for serving, Postgres or equivalent for state, and Docker for deployment
• Built or maintained a non-trivial agent system end to end: orchestration, tool calling, retrieval, evaluation, deployment
• RAG experience: hybrid retrieval, chunking strategy, evaluation, citation grounding, no-answer fallback
• Production cloud deployment on AWS, GCP, or Azure. Comfortable with continuous integration and deployment, observability, on-call
• Evaluation discipline: you measure on production traffic, you write the eval harness, you do not ship without it
• Written and spoken English at B2 or above
• Can take an ambiguous problem and ship a working system without daily supervision

Strong plus:

• Open-source contributions to LangGraph or LangChain, or you have published LangGraph patterns others use
• You have built a platform or framework that other engineers use. You have written the documentation for it
• Comfort with a second orchestration approach beyond LangGraph (Claude Agent SDK, AutoGen, CrewAI, or hand-rolled) so you can make the right call per client
• Fine-tuning experience: LoRA, PEFT, instruction tuning, distillation
• Open-source contributions to LlamaIndex, DSPy, Haystack, or similar
• Background in classical ML (scikit-learn, gradient boosting, time series)
• MCP (Model Context Protocol) experience or interest
• Shopify ecosystem, Snowflake, or Postgres extensions experience
• Ukrainian native or fluent

You get full ownership of a core production system with senior peers and direct access to decision makers.
 

You you also get remote work with flexible daily hours and authority to shape engineering standards for agent systems.

We invite a Senior Software Engineer with strong .NET experience to join our team and help build cutting-edge financial technology solutions for our client’s institutional partners and global users. You'll play a key role in developing scalable backend systems and decentralized financial protocols while collaborating closely with a leading U.S.-based fintech and regtech company.

🟩 What's in it for you:

• Work with a leading U.S. fintech/regtech company supporting global financial institutions
• Contribute to a modern financial platform built on an enterprise-grade .NET 8 and Azure stack
• Gain hands-on experience in a secure, high-compliance environment (PCI DSS Level 2)

✅ Is that you?

• 5+ years of experience in backend software development
• Strong experience building backend applications and web services using .NET 8 and ASP.NET Core
• Advanced proficiency in C# (up to version 12)
• Solid experience designing and developing REST APIs
• Strong understanding of microservices architectures
• Hands-on experience with SQL and relational databases
• Experience with unit and integration testing
• Experience with NServiceBus or similar messaging systems
• Good understanding of Docker and containerization concepts
• Experience participating in code reviews and maintaining high engineering standards
• Familiarity with cloud platforms, preferably Azure
• Strong troubleshooting, analytical, and problem-solving skills
• Proactive mindset with the ability to learn quickly and adapt in a fast-paced environment
• Strong communication and collaboration skills with experience working in Agile/Scrum teams
• Upper-Intermediate English level

Desirable:

• Experience with NoSQL databases
• Knowledge of Redis or other in-memory data storage solutions
• Familiarity with Azure DevOps
• Experience with logging/monitoring tools (DataDog)
• Understanding of authentication & authorization models (IdentityServer)
• Experience in the fintech domain

🧩Key responsibilities and your contribution

In this role, you'll help build and maintain scalable backend applications and web services while collaborating with cross-functional teams in a dynamic Agile environment.

• Participate in requirements analysis and Agile/Scrum team ceremonies
• Collaborate with cross-functional teams to design and deliver software solutions
• Build scalable and maintainable backend applications and services using .NET technologies
• Refactor, troubleshoot, debug, and optimize existing applications
• Contribute to system stability, performance, and ongoing improvements
• Develop and maintain technical documentation throughout the software development lifecycle
• Participate in code reviews and support engineering best practices

🎾 What's working at Dev.Pro like?

✔️ 30 paid days off per year — take them whenever you want for vacation, holidays, or personal time
✔️ 5 paid sick days, up to 60 days of medical leave, and 6 paid days off per year for major family events like weddings, funerals, or the birth of a child
✔️ Partially covered health insurance after the probation, plus a wellness bonus for gym memberships, sports nutrition, and similar needs after 6 months
✔️ Grow your skills with English lessons, online training, conferences, and the option to explore new career paths

Our next steps:

✅ Submit a CV in English — ✅ Intro call with a Recruiter — ✅ Internal interview — ✅ Client interview — ✅ Offer

About Digis
Digis is a European IT company with 230+ specialists delivering complex products for 70+ clients across the U.S., Europe, and Canada. We operate in a remote-first environment and focus on long-term collaboration, stable projects, and transparent processes.

About the Project
You will join a long-term UK-based healthtech project focused on remote patient monitoring and connected care.
The product helps improve healthcare services for patients and supports research and therapy development. The project is mature, stable, and continues to grow, with a strong engineering team and well-organized QA processes.

Requirements

• 5+ years of general experience in QA
• 2+ years of commercial experience in automation testing
• 1+ year of recent hands-on experience with JavaScript
• 1+ year of recent hands-on experience with WebDriverIO
• Upper-Intermediate+ English level

Responsibilities

• Develop and maintain automated tests using JavaScript and WebDriverIO
• Cover functional, regression, API, and end-to-end testing scenarios
• Analyze test results and report defects
• Contribute to improving test automation coverage and QA processes

Advantages

• Long-term healthtech project with meaningful product impact
• Stable and established business
• Strong and experienced QA/engineering team
• Focus on quality, automation, and clear processes

We Offer

• 20 paid vacation days per year
• 5 paid sick leaves
• Compensation for professional courses
• English learning support
• Work equipment
• Transparent communication and processes
• Opportunity to switch projects within Digis
• Legal and accounting support
• Corporate psychologist

We are looking for a technical Head of Corporate IT who is ready to take full ownership of the corporate infrastructure strategy, budget management, and the transformation of access and security processes. In this role, you will lead a team of 35 engineers, build highly effective processes for the internal Help Desk team, improve the existing office infrastructure and service integrations, and own the global IT Procurement function, ensuring smooth operations and scalable growth across the business. Your ideas will have the potential to transform processes across the entire global company, helping the business achieve its strategic goals.

Responsibilities:

1. Identity & Access Management (IAM)

• Develop and maintain a secure and scalable identity and access management strategy across the organization in close collaboration with Security team
• Configure and manage authentication and access control mechanisms, including SSO, MFA, VPN access policies, and privileged access management
• Drive implementation and improvement of Zero Trust and security-first infrastructure approaches

2. IT Service Management (ITSM) & Operational Processes

• Build and improve transparent ITSM processes
• Develop and maintain a strong service-oriented IT culture focused on operational excellence and user experience
• Define and monitor SLA/KPI metrics, analyze team performance, and drive continuous improvements based on operational data
• Automate routine IT operations 

3. Infrastructure Management & Operations

• Ensure stable, secure, and scalable operation of the company’s IT infrastructure
• Manage hybrid infrastructure environments, including MacOS and Windows endpoints; Linux/Unix systems
• Oversee enterprise networking infrastructure (LAN, VLAN, VPN, Wi-Fi, firewall)
• Ensure high availability, business continuity, backup, monitoring, and disaster recovery practices

4. Leadership & Team Management

• Build a high-performance engineering culture with strong ownership and accountability
• Manage hiring, onboarding, mentoring, performance reviews, and professional development of technical leaders and engineers
• Coordinate cross-functional collaboration with Security, Engineering, Infrastructure, and Business teams
• Manage relationships with vendors, hardware providers, and external service partners
• Plan infrastructure roadmap and ensure alignment between IT infrastructure and business goals

Requirements:

• 5+ years of experience in IT Infrastructure, System Administration, or IT Help Desk
• At least 2 years of experience in managing infrastructure and support engineering teams of 20+ employees
• Experience working in high-availability, high-security international environments
• Strong experience with vendor management, budgeting, procurement, and operational planning
• Strong hands-on expertise in Linux/Unix Administration, macOS endpoint management, Windows infrastructure
• Experience implementing and improving SLA-driven support processes
• Strategic mindset with the ability to scale infrastructure together with business growth
• Strong ownership mentality and high standards for operational excellence
• Ability to structure ambiguous environments and drive operational improvements
• Leadership approach based on collaboration, mentoring, and accountability

Nice to Have

• Experience in FinTech, Trading, or high-load environments
• Experience with Zero Trust architecture and modern IAM approaches
• Scripting/programming experience (Python/Bash)

We offer

• 20 paid vacation days per year
• 10 paid sick leave days per year
• Public holidays as per the company’s approved Public holiday list
• Medical insurance
• Professional education budget
• Language learning budget
• Wellness budget (gym membership, sports gear and related expenses)