Jobs

We are looking for a Vue.js 2 Developer (SSR + EJS, Options API) to join a project — a modern platform for creators that combines content publishing, community building, and monetization within one ecosystem.

Requirements

• Strong experience with Vue.js 2 and the Options API
• Good understanding of SSR (Server-Side Rendering)
• Experience with EJS or similar templating engines such as Blade (Laravel) or Twig (Symfony)
• Understanding of how Vue applications are initialized in SSR environments
• Experience working with separate Vue applications per page (without Vue Router inside one large SPA)
• Understanding of browser-side vs server-side rendering and data hydration approaches
• Experience passing server-side data into frontend applications (e.g. window.__DATA__)
• Experience working without Vuex/global stores
• Understanding of component communication through props and custom EventBus solutions
• Experience with SASS
• Familiarity with Bootstrap/Tailwind styling approaches
• Strong level of English

Nice to Have

• Experience with API integrations
• Experience optimizing SSR applications

• Experience working on content or creator-focused platforms

   

Interview Process

1. HR Call
2. Technical Interview
3. Test Task (optional)

4. Final Call with the Client

    

What we offer

💸 Competitive compensation based on your experience and skills

👭 A friendly and supportive team of like-minded professionals

🤒 Paid sick leave

🌴 21 working days of paid vacation + Polish national holidays

🎉 Corporate events and team activities

🩺 Private medical care (for residents in Poland)

🧩 Opportunities for continuous learning and development

About Project: Multi-tenant exhibition platform that powers AI-guided, gamified visitor experiences for live venues.

Experience:
• Strong production experience on AWS (Lambda, ECS, Aurora or RDS, and the surrounding services)
• Deep PostgreSQL: schema design, query performance, and hands-on experience with row-level security or another rigorous approach to multi-tenant data isolation
• TypeScript fluency on the server side
• Experience designing event-driven or streaming systems (SQS, Kinesis, WebSocket, or equivalent)
• A track record of operating production services: metrics, tracing, alerting, on-call response

Nice to Have:
• LLM integration in production: prompt engineering, streaming inference, latency and cost optimization
• Real-time audio or TTS pipelines
• B2B multi-tenant authentication (Stytch, Auth0, Cognito, or similar)
• Reading Rust (one Rust service in production)
• Headless CMS integrations
• Beacon, BLE, or other sensor-data ingestion pipelines
• Background in cultural, museum, live-event, or exhibition technology

Tech: AWS end-to-end. Lambda and ECS Fargate for compute, Aurora PostgreSQL with pgvector and row-level security for data, ElastiCache Redis, S3 + CloudFront, SQS for fan-out, API Gateway in front. TypeScript on the services, Rust on the streaming layer. Stytch for authentication. PostHog and Mixpanel for analytics. Terraform per service, GitHub Actions for CI/CD.

English level: Upper intermediate (Must be able to speak fluently!)

Requirements: 


-5+ years of experience in JavaScript game development
- Strong knowledge of HTML5, Canvas API, and DOM manipulation
-Proven track record in creating HTML5 games
-Advanced proficiency in JavaScript (ES6+), including async/await, modules, closures, and classes
-Experience with popular libraries/frameworks such as Phaser, Pixi and Three.js
-Solid understanding of object-oriented programming and expertise in performance optimization algorithms, memory management, and threading
-Experience integrating and optimizing Spine animations in game engines
-Experience with slots
-experience in leading and mentoring front-end development teams.
-strategic, structured and analytical thinking.
-strong collaboration and communication skills.


Responsibilities:

-Manage front-end developers team, and perform code reviews;
-Write clean, efficient, testable, and scalable code;
-Collaborate closely with the team to identify and prioritize areas for enhancement;
-Take part in the full development cycle and ensure smooth development and cooperation between the dev team and product owners
- Hands-on experience with AI tools as part of everyday work is a must


Nice to Have:

+ Experience optimizing HTML5 games for mobile browser performance
+ Understanding of CI/CD


Work conditions:

— Flexible working hours and the freedom to work remotely;
— Paid vacation of 20 workdays/year and 5 workdays/year for sick leaves;
— Unlimited unpaid day-offs to take care of personal matters;
— A range of paid benefits to choose from;
— Personal development plan to support your growth
— Skills training to sharpen your expertise;
— Education office featuring internal and external experts and mentorship programs;
— Structured processes through our corporate confluence;
— Open-minded management style with transparent communication of company strategy and plans;
— Performance-based reviews to recognize and reward your contributions;
— Stress management initiatives, including 1-1 meetings and a feedback culture;
— Engaging in corporate team-building events, marathons, and online challenges;
— Family-friendly policies, including special congratulatory gifts for personal milestones like the birth of a child or a wedding.

If you are an ambitious and enthusiastic professional, always eager to learn and achieve the best results, Twin Win Games is the place for you! We offer ample opportunities for personal development and professional growth. Join us as we continue to create innovative and exciting gaming experiences.
 

You will own and drive the global marketing strategy across SEO, Retargeting (DSP), and SMM, ensuring scalable growth and maximum ROI across multiple GEOs.

Responsibilities:

• Define and execute full-funnel marketing strategy across SEO, Retargeting, and SMM
• Build, structure, and scale marketing teams
• Own KPI framework (ROI, LTV, CPA) and drive channel performance
• Manage and optimize media buying, retargeting campaigns, and traffic sources
• Oversee SEO strategy (technical, content, link-building)
• Lead SMM with a focus on performance and conversion
• Establish reporting systems and analyze funnel performance
• Own budget allocation and optimize for maximum ROI
• Collaborate with Product, CRM, and Affiliate teams

Requirements:

• 5+ years in performance marketing (mandatory: iGaming / betting / gambling)
• 2+ years in leadership roles (Head / Lead level)
• Experience managing SEO, Retargeting / DSP, and SMM channels
• Experience building and scaling marketing teams
• Strong expertise in:
  • SEO
  • Performance marketing / media buying (CPA, ROAS, LTV)
  • Retargeting / DSP
  • SMM (performance-focused)
• Data-driven approach:
  • KPI management (ROI, LTV, CPA)
  • Reporting and funnel analysis
• Experience managing and allocating marketing budgets
• Fluent English (spoken and written)

What we offer:

• Paid Vacation: 21 working days of paid vacation per year.
• Sick Leave: 25 paid sick days per year — no medical certificate required.
• Personal Days Off: 3 paid personal days off per year — just for rest and balance.
• Sports benefits.
• Medical reimbursement.
• Flexible working conditions: You can discuss with your manager the balance between remote and in-office work that suits you best.
• Professional Development: a dedicated budget of $600 per year to support your continuous learning — seminars, courses, and conferences included.
• Business Trips: including visits to our main office in Cyprus and participation in international industry conferences — a chance to connect with the team in person and stay on top of key market trends.

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

We are looking for a Senior Bank Partnership Specialist to own and grow relationships with banks and payment providers. This is a role for someone who is equally comfortable in a negotiation room and in a technical scoping call: you will lead commercial discussions with banks, drive the integration of their payment products into our platform, and work hand in hand with the partnerships and sales teams to turn those connections into real business value. If you understand how payment ecosystems work, enjoy building long-term institutional relationships, and like seeing a deal through from first contact to a live, revenue-generating integration, this role is for you.

Details

• Schedule: Full-time
• Location: Remote
• Start: ASAP
• Duration: Long-term
• English: Fluent

About the role

The Bank Partnership Specialist sits at the intersection of business development, payments, and sales. You will be the primary point of contact between our company and our banking and payment partners, responsible for sourcing new relationships, negotiating commercial and technical terms, and managing the full lifecycle of each partnership. A large part of the role is making payments actually work: coordinating the connection of banks and payment systems to our platform, aligning technical requirements between partners and our internal teams, and ensuring integrations launch smoothly and stay healthy. You will also partner closely with the sales department, equipping them with the payment capabilities, coverage, and partner context they need to win and retain customers. It is a high-ownership role with direct impact on revenue, payment coverage, and the company's standing with financial institutions.

You have

• 5+ years of experience in banking partnerships, payment provider relationships, fintech business development, or a closely related field
• A strong track record of negotiating and closing commercial agreements with banks, acquirers, or payment service providers
• Solid understanding of the payments ecosystem: card schemes, acquiring, payment gateways, settlement, PSPs, and related infrastructure
• Experience coordinating or managing payment integrations, including connecting banks or payment systems into a platform or product
• The ability to translate between commercial and technical stakeholders, and to scope integration requirements with partners and engineering teams
• Familiarity with payment regulation and compliance considerations (KYC/AML, PCI DSS, licensing) at a working level
• Experience collaborating with sales teams and enabling them with partner capabilities and go-to-market support
• Strong communication, relationship-management, and stakeholder-management skills
• A self-directed, ownership-driven approach, comfortable working independently in a fully remote setup
• Fluent English (written and spoken)

What to do

• Identify, approach, and build relationships with banks and payment providers that expand payment coverage and capabilities
• Lead commercial negotiations with banking partners, covering pricing, terms, and partnership structure through to signed agreement
• Manage the end-to-end onboarding of new partners, from initial contact to a live, production integration
• Coordinate payment integrations: align technical requirements between partners and internal engineering, and drive the connection of banks and payment systems into our platform
• Serve as the ongoing point of contact for partner banks, monitoring performance, resolving issues, and growing each relationship over time
• Work closely with the sales department, providing payment capabilities, partner context, and support for customer deals
• Collaborate with the partnerships team to align on strategy, priorities, and the partner pipeline
• Track partnership performance and integration health, and report on coverage, status, and opportunities to stakeholders
• Stay current on payment industry trends, regulation, and competitor activity to inform partnership strategy

📍 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.

Location: Remote (Europe)
Experience Level: 5+ years

About the Project
We are looking for a Senior Backend Developer (close to Architect level) to design and build core backend services for the ORA platform. The role is focused on secure cloud integration using KMIP and Barbican, with strong involvement in cryptography, Kubernetes, and open-source technologies.

Key Requirements

Must have:

• Senior-level experience in backend development with Java, Golang, or Python
• Proven hands-on experience in crypto-related projects (clearly visible in CV)
• Strong understanding of cryptography, including TLS and data encryption
• Practical expertise with Kubernetes (infrastructure and management layers)
• Experience working with OpenStack
• Solid background in unit and integration testing
• Experience designing and maintaining distributed systems and core backend services
• English level: Upper-Intermediate / Advanced (C1+)

Nice to have (at least one of):

• Experience with KMIP and key management systems
• Knowledge of Barbican or similar solutions
• Understanding of cloud convergence and ORA architecture
• Experience with microservices scalability and performance optimization
• Familiarity with open standards and open-source integrations

Tech Stack
Java, Golang, Python, Kubernetes, OpenStack, Unit Testing, Integration Testing

Responsibilities

• Design and develop core backend services for ORA
• Integrate with KMS via KMIP (e.g., Barbican, Ceph)
• Build and manage Kubernetes-based infrastructure (CRDs, operators, controllers)
• Implement secure communication using TLS and encryption mechanisms
• Collaborate with architecture and infrastructure teams
• Develop and maintain unit and integration tests
• Participate in architectural decisions and provide technical leadership

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

TemaBit Fozzy Group is an IT company that develops unique solutions for more than 40 businesses of Fozzy Group. We specialize in web and mobile development, as well as software for managing business processes and infrastructure projects.

In addition, we experiment and care about the team and the Guest, we value cooperation, we preach honesty and openness.

You will play a key role in the development and evolution of a large-scale enterprise platform focused on backend services, business process automation, and integrations between multiple internal and external systems.

The project combines existing enterprise applications with modern backend services developed using .NET 6–10. While the system heavily relies on Microsoft SQL Server, the strategic direction is to gradually move business logic from database-level implementations into maintainable and scalable C# backend services.

This role is primarily focused on backend development using modern .NET technologies, with SQL Server serving as an important part of the overall architecture.

Key Responsibilities:

• Design, develop, and maintain backend services and APIs using modern .NET technologies (.NET 6+)
• Implement and maintain business logic in C#
• Collaborate with engineering teams on system design, integrations, and modernization initiatives
• Work with Microsoft SQL Server and existing database-level business logic
• Analyze existing SQL-based processes and participate in migrating business logic into backend services
• Develop and maintain integrations using REST APIs and other enterprise integration patterns
• Participate in architecture discussions and implementation of microservice-based solutions
• Follow engineering best practices including code reviews, testing, and CI/CD processes
• Support junior and middle developers through technical guidance and collaboration

• Leverage AI-powered development tools (e.g. GitHub Copilot, ChatGPT, Amazon Q) to improve productivity and development workflows

   

Requirements:

• 5+ years of commercial .NET development experience
• Strong experience with modern .NET (.NET 6/7/8+)
• Strong understanding of backend application architecture and API development
• Solid experience with C#
• Good practical knowledge of Microsoft SQL Server and Transact-SQL
• Experience working with existing SQL-based business logic and integrations
• Experience with EF Core and/or Dapper
• Experience with REST APIs and backend integrations
• Experience with unit/integration testing
• Experience using AI-powered development tools to enhance productivity, code quality, and testing efficiency
• Experience with Docker
• Understanding of software architecture and modernization approaches
• Understanding of Agile/Scrum methodologies and experience working in an Agile environment
• Intermediate/B1 English level

• Strong communication and problem-solving skills

   

Nice-to-have Skills & Experience:

• Experience with AWS Cloud Native development and familiarity with AWS services (e.g. Lambda, API Gateway, S3, Fargate)
• Experience with .NET Framework 4.8
• Experience with Windows Forms applications
• Experience with WCF services
• Experience with DevExpress UI components
• Experience with GitLab CI/CD pipelines

We propose:

• The ability to generate and influence decision-making
• Competitive salary discussed based on the results of the interview with the successful candidate
• Medical insurance
• Discounts for network employees
• Remote work mode, and if you want to work in the office — there is a cozy co-working space in the Silver Breeze business center in Kyiv