Jobs Backend

iPay.ua — a nationwide online payment and transfer service in Ukraine that allows users to pay for goods and services at over 2,000 merchants using payment cards.
We are one of the leaders in the online payments industry. Every day, we process over 76,000 payments, with more than 27 million transactions completed in 2025. Learn more about us, our mission, values, and goals on our site.
Now we find a Senior PHP Developer.

Наразі ми шукаємо Senior PHP Developer (Backend-focused, React.js as a plus) до нашої команди.

Requirements

— Backend (core focus):
Strong experience with PHP 7/8 (Laravel or similar frameworks). Ability to work with legacy code and improve it safely.
— System thinking:
Experience with high-load or mission-critical systems (payments, fintech, or similar). Understanding of performance bottlenecks, consistency, and failure scenarios.
— Databases:
Strong MySQL skills: query optimization, indexes, working with large datasets (10M+ records).
— Architecture:
Solid understanding of OOP, SOLID, and practical design patterns (not textbook cosplay).
— API design:
Experience building and maintaining REST APIs.
— DevOps basics:
Git, CI/CD, basic Docker usage, understanding of production environments.
— Frontend (secondary):
Experience with React.js is required at a practical level (understanding architecture, ability to support or launch features), but this is not a frontend-heavy role.

Nice to Have

— Experience with payment systems or fintech
— Understanding of PCI DSS / security basics
— Experience with observability (logs, metrics, tracing)
— Experience working with legacy systems under load

Responsibilities

— Work hands-on on backend logic and critical payment flows
— Improve and stabilize existing system (performance, reliability, edge cases)
— Design and implement new features and APIs
— Participate in architectural decisions (practical, not theoretical)
— Support integrations with external partners (banks, PSPs, etc.)
— Help team with code reviews and knowledge sharing

Want to work at the cutting edge of modern technology and artificial intelligence? We have something just for you.

We are looking for a Node.js engineer who is not only confident in backend development but also has a genuine interest in AI integrations, LLM agents, and new automation technologies. This role involves participating in the creation and development of AI assistants, platforms, and interfaces that help businesses be more efficient.

What to expect:

• Regular technical challenges — a new case from a customer every week
• Flexible use of AI tools (OpenAI API, WhatsApp/Telegram API, OCR, N8N, scrapers)
• Hands-on experience with workflow automation platforms, particularly N8N, for creating complex business process automations
• Building end-to-end AI workflows that connect multiple services and APIs
• Opportunity to experiment with emerging AI technologies and automation tools as they become available

Our main requirements are:

• Experience in hands-on programming 3+ years
• Experience doing Node.js (Vanilla/Typescript)
• Experience with NestJS also and/or NextJS and/or Express
• Strong creating with SQL/NoSQL databases efficient design from scratch as well as performing optimizations
• Strong knowledge in Computer Science: data types, data structures, algorithms
• Being proficient working on modern tech stack: Docker, Kubernetes, CI/CD, IaC (e.g. Terraform), Ansible etc.
• Having a wide strong background working with AWS (smth beyond EC2 and S3)
• Understanding and applying software design principles
• Experience designing software systems (distributed, high availability, resilient)
• Comfortable working Agile and Design Thinking (however understanding that pure Agile is a myth)
• Being comfortable in several projects at once (taking apart hands-on aspect)
• Strong communication skills in English (B2 and better)
• Willingness and enthusiasm to learn workflow automation tools (especially N8N) and adapt to rapidly evolving AI technologies

Will be considered as a plus:

• Experience with modern SPA frameworks like React/Vue.js/Angular
• Experience with NestJS
• Experience writing technical documents, tracking technical debt, understanding refactoring etc.
• Experience working with AI libraries and/or 3rd parties like chatGPT, Claude, Gemini or Perplexity
• Previous exposure to workflow automation platforms (N8N, Zapier, Make.com, or similar)
• Experience with RAG implementations, vector databases, or knowledge management systems
• Familiarity with MCP (Model Context Protocol) or similar AI integration standards
• Understanding of prompt engineering and AI agent behavioral design
• Experience building conversational AI interfaces or chatbots

Hiring process:

• HR interview: we’ll talk about your professional background, the specifics of the position we are offering, and address any questions you might have.
• Tech interview: a deeper look into your technical expertise and problem-solving approach, ensuring your skill set aligns with our project’s needs.
• Interview with the C-Level: a conversation focused on the company’s vision, strategic goals, and how your role aligns with them.
• Feedback
• Job offer

What we offer at iForAI:

• Hardware Policy: Get the gear you need, from laptops to PCs.
• Referral Bonus: Invite talent and earn a generous reward.
• Professional Growth: We cover courses and books to fuel your expertise.
• Tasty Perks: Free lunches, snacks, tea, and coffee to stay energized.
• Birthday & Celebrations: Gifts on your day, plus parties and team-building.
• Life Events Support: Wedding bonuses, childcare support, and more.
• Volunteering Days: Extra days off to help your community.
• Work-Life Balance: 18 paid vacation days, 10 paid sick days, and national holidays off.

We are hiring a Senior Full Stack Developer for an Israeli deep tech company building a cloud-native platform for monitoring critical infrastructure at scale.

The product enables utilities, energy companies, and infrastructure operators to detect threats, anomalies, and operational events in real time across thousands of kilometers of pipelines, power lines, railways, and perimeter assets.

The platform processes continuous streams of acoustic sensor data from distributed fiber optic networks, applies machine learning classification, and delivers actionable alerts through a smart command and control interface. It integrates with SCADA systems, Digital Twins, and other enterprise environments.

The frontend is a critical part of the system, serving as the main interface for maps, dashboards, real-time alerts, and operational workflows used daily by field teams and enterprise clients.

The system is cloud-native, built with Next.js and NestJS in TypeScript, running on AWS with Kubernetes and Docker. The product is already live and used by enterprise customers across multiple industries.

In this role, you will work across the stack, with a strong focus on frontend development, owning features end to end from architecture through production.

Responsibilities

• Design and implement scalable, high-performance web applications end to end

• Build modern, responsive, and user-centric frontend applications using Next.js

• Architect and develop backend services and APIs with NestJS

• Own frontend-heavy features from concept to production

• Work closely with product, R&D, and domain experts to translate complex data into intuitive UI/UX

• Leverage modern AI tools to improve development speed and code quality

• Participate in technical discussions and contribute to key architectural decisions

• Optimize performance, reliability, and security across the stack

• Mentor developers and promote engineering best practices

Tech Stack

• Full stack: Next.js, NestJS (TypeScript)

• Frontend: Chakra UI or shadcn, modern component-driven architecture

• Testing: Cypress

• Infrastructure: Kubernetes, Docker, CI/CD

• Database: SQL or NoSQL

• Cloud: AWS (Lambda, ECS or EKS, S3, RDS)

Requirements

• 5+ years of experience as a Full Stack Developer

• Strong hands-on experience with frontend development, especially Next.js and React ecosystem

• Experience building complex, data-heavy user interfaces

• Experience with Chakra UI or shadcn

• Experience with Cypress or similar testing frameworks

• Solid understanding of system design, scalability, and cloud architecture

• Hands-on experience with AWS in production environments

• Experience with Docker and Kubernetes

• Fluent in English with strong communication skills

• Experience in startup or fast-paced environments

• Strong ownership mindset and problem-solving skills

AI and Modern Engineering Expectations

• Active use of AI-powered development tools such as Claude Code, Code Rabbit, or similar

• Ability to use AI to accelerate development, improve code quality, and enhance product capabilities

Nice to Have

• Experience with microservices architecture

• Experience with Python and Dash

• Background in performance optimization and distributed systems

This is a long-term opportunity to work on a technically advanced product with real-world impact, large-scale infrastructure, and a strong engineering culture within one of Israel’s leading deep tech companies.

Job description

About DualEntry

Founded in 2024, DualEntry is one of the world’s fastest-growing AI startups.

At DualEntry, the future of finance is being written today. ERP is one of the largest fintech markets in the world ($220,000,000,000+). Yet, tens of thousands of companies are still using on-premise systems, and the industry has not seen new entrants in more than 30 years.

Our AI-native ERP lets accounting teams achieve more in less time. $5M-ARR businesses to NYSE-listed companies trust DualEntry to automate away manual data entry work with AI. We’re finally making the one-person finance team a reality and putting the pain of legacy ERPs from the 1990’s in the past.

We operate with urgency and ownership. We move fast.

Why This Role Matters Now

Since starting 18 months ago, we’ve raised $100,000,0000+ from world-class investors such as Lightspeed Venture Partners, Khosla Ventures, Contrary Ventures and Google Ventures, as well as more than 20 angel investors who’ve built, scaled, and exited some of the most impactful companies of the last decade.

We got there by moving incredibly fast and hiring an exceptionally sharp, hard-working and deeply committed team from leading tech and accounting companies — Ramp, Meta, Microsoft, Lyft, PwC, Deloitte, J.P. Morgan, Bloomberg, Sage, Xero and Intuit. And some of us don't have a fancy logo on our resume and are here for a shot to prove ourselves.

We’re a small team, growing fast with huge momentum - join early.

This is an intense, hands-on role with full ownership. We expect you to push for excellence and raise the bar.

📍 Location: Remote - this role is available across all countries with 4hr+ overlap for the US ET timezone (NYC HQ)

Where you'll create impact

• You’ll own end-to-end execution for backend systems and infrastructure
• You’ll build APIs, services, and real-time systems handling complex accounting logic
• You’ll collaborate with founders, product, and frontend engineering to turn complex workflows into secure, performant systems
• You’ll design, implement, and ship production-ready features at high speed
• You’ll manage data migrations, scaling challenges, external integrations, and end-to-end reliability
• You’ll drive measurable outcomes that accelerate DualEntry’s product velocity and stability

What sets you up for success

• Hardcore work ethic and high agency
• 8+ years of experience in backend engineering
• Proven track record in high-growth, high-ownership environments
• Strong skills in PostgreSQL, SQL, ORMs, migrations, and schema design
• Experience with AWS or comparable cloud infrastructure
• Strong API design and testing experience
• Understanding of CI/CD, deployment, and production readiness
• Bonus: expertise in Python and modern frameworks (FastAPI, Flask, or Django)
• Ability to manage complex systems with evolving requirements
• Fluent English (C1+) with clear communication

How You Operate

• Pragmatic: you like to move forward and make decisions based in reality (not theory). We don't debate if Cassandra has the most theoretical scalability -- we use Postgres until it breaks
• Hard working: 'You can work long, hard, or smart, but [here] you can't choose two out of three" - Jeff Bezos. We wrote this job post during the weekend
• Curious: you love to learn, are highly curious about new frameworks and solutions to engineering problems
• Fast-moving: you deploy daily, iterate quickly, and never wait for permission

Why you’ll thrive here

• Significant equity ownership in one of the top AI companies in the world
• You’re joining early and will grow with DualEntry
• Your feedback shapes the product directly
• High-speed culture
• High-trust environment with high expectations
• Ambitious mission - ERP is one of the largest B2B software markets in the world ($220bn per year), this is a once in a lifetime opportunity to build the next generation ERP in an industry that has not seen new entrants in 30+ years

Benefits & Perks

• Base Salary: $100,000 – $175,000 USD
• Equity: $75,000+ USD
• Contract type: B2B
• Remote-first team - the fastest team you will have ever worked with
• Time Off: 15 PTO days + 12 public holidays
• Visa sponsorship option for relocation to NYC within 2+ years
• Early-stage role with high autonomy and real long-term upside
• Enjoy a learning & development budget for courses, certifications, and language learning to keep growing your skills.
• Work where you feel most productive at co-working spaces or from your home office with support for setup, internet, and phone.
• Plus, wellness perks and more to make your workday even better!

We hire the best, expect the best, and give you the masterclass of your career - an archaic and huge industry like ERP only goes through a restructure like this once in a lifetime. It’s hard, it’s intense, and it’s the most rewarding work you’ll ever do.

If you’re hungry, driven, and ready to build something massive, climb aboard!

At DualEntry, we believe great products come from diverse teams. We’re an equal opportunity employer, and we’re committed to a culture where everyone feels included, supported, and able to do their best work.

Data Science UA is a service company with deep expertise in AI and Data Science. Our story started in 2016 with the first Data Science UA Conference in Kyiv, and since then, we’ve built one of the largest AI communities in Europe.

About the role:
We are looking for a Platform+Python/JS Engineer to join our team and help build, maintain, and scale AI-powered interactive products.
This is a hands-on role for an engineer who owns deployment, infrastructure, real-time systems, and AI-service integration end to end. You will work on production systems that combine web applications, real-time communication, Kubernetes-based backend services, and GPU-hosted AI pipelines.
The core of this role is production reliability and deployment ownership — keeping live systems stable, responding to incidents, and integrating AI models into scalable real-time infrastructure. Frontend work exists but is secondary: the team has a designer and uses AI-assisted tooling for UI iteration.

Responsibilities:
- Own deployment, environment management, and release workflows across Kubernetes-based, Railway-hosted, and other cloud infrastructure.
- Deploy and operate AI inference services on GPU platforms such as Modal or RunPod and integrate them into real-time product flows.
- Build and maintain real-time communication and async processing flows, including LiveKit-based session infrastructure.
- Work with Python and TypeScript(Node.js) / JavaScript application code in production environments.
- Support database-backed product features, schema evolution, and migration workflows.
- Improve observability, logging, monitoring, and incident debugging workflows.
- Contribute to frontend and backend product functionality as needed, using AI-assisted tooling where appropriate.
- Maintain clear and up-to-date documentation for every product, service, and integration, including architecture diagrams, API contracts, deployment procedures, and environment configuration.
- Ensure every new feature is discussed, scoped, and agreed upon before implementation begins. No undocumented or uncoordinated changes to production systems.
- Collaborate with engineering and product stakeholders to clarify requirements, identify risks, and ship practical solutions.

Required skills:
- Experience with AWS, Kubernetes, Helm, and container-based deployment workflows.
- Experience maintaining or modifying CI/CD pipelines, preferably with Jenkins or a similar legacy setup.
- Experience with real-time systems: WebSocket-based communication, session lifecycle management, and event-driven flows.
- Experience deploying and operating AI inference services on GPU platforms such as Modal, RunPod, Replicate, or similar.
- Experience with Python for production backend development.
- Experience integrating LLM-based services, voice AI APIs, or media-processing pipelines into production systems.
- Experience debugging distributed or multi-service systems, including reading logs across multiple services and environments.
- Solid understanding of backend APIs, service integration, and system design.
- Experience with PostgreSQL and ORM-backed schema management and migrations.
- Experience with TypeScript (Node.js) and frontend experience to ship and deploy UI changes with AI-assisted tooling.
- Ability to work independently and bring structure to ambiguous technical situations.
- Strong written and verbal English communication skills.
- Experience using AI-assisted coding tools (e.g., Cursor, GitHub Copilot, Gemini) for faster development and iteration

What we offer:
- Real impact: your content will directly attract new clients.
- Mentorship and growth.
- Freedom to experiment and test new formats.
- Flexible schedule and a remote-first culture.

About the Role

We are looking for a Senior ML/Ops Engineer to join a core algorithmic platform team building real-time ML inference systems at massive scale.

This is a highly technical, hands-on role focused on designing and operating production-grade ML systems, not research. You will work on systems that handle high throughput and strict latency requirements, with full ownership across backend, ML, and infrastructure layers.

Responsibilities

• Design, build, and maintain real-time ML inference services
• Develop and scale backend systems in Python
• Own end-to-end ML systems (architecture, services, pipelines, infrastructure)
• Integrate ML models into production services and business logic
• Optimize systems for low latency and high throughput
• Work with streaming systems and event-driven architectures
• Ensure system reliability, monitoring, and performance in production
• Collaborate closely with Data Scientists and engineering teams

Tech Stack

• Python (core language)
• Kafka / streaming systems
• Kubernetes, AWS / GCP
• FastAPI, Triton or similar inference frameworks
• Feature stores, model serving, A/B testing, monitoring tools
• High-performance data stores (Redis, Aerospike, etc.)

Requirements

• Strong backend engineering background in Python
• Hands-on experience with MLOps and production ML systems
• Experience building and owning end-to-end systems
• Experience with real-time / low-latency systems
• Experience working with high-scale environments (large traffic, high throughput systems)
• Strong system design skills (APIs, inference services, SLAs)
• Solid understanding of the ML lifecycle (training → deployment → monitoring)

Ideal Background

• Started as a Backend Engineer (Python) and transitioned into ML Engineering / MLOps
• Built production-grade ML services, not just pipelines
• Experience in high-scale domains (AdTech, Fintech, Gaming, streaming systems)

Important Notes

• This is a high-ownership role in a core team
• The domain is complex and niche — focus is on quality over quantity
• Experience with high-scale systems is highly preferred

Not a Fit If

• Pure DevOps / Infrastructure profile
• Only worked with ML pipelines (Airflow, ETL) without production ML
• No experience with real-time systems or latency constraints
• Mostly research or Data Science background without production systems

Hiring Process

• 2–3 interview stages

This role is ideal for engineers who combine strong backend engineering with ML systems experience and enjoy building real-time, high-scale production systems from end to end.

Code&Care — is a successful full-stack development company, which provides clients with high-quality development assistance worldwide.

Now our team has a position for Senior Laravel Developer.

Requirements:

• 5+ years of experience with PHP and Laravel
• Strong experience with REST APIs
• Good understanding of Laravel (Service Container, Providers, Facades)
• Solid experience with Eloquent ORM
• Experience with Redis and caching
• Experience with queues (Laravel Queues, Horizon)
• Experience with AWS (EC2, S3, RDS)
• Strong SQL and database design skills
• Experience with Docker
• Git, Agile (JIRA)
• Upper-Intermediate or higher level of English
• Availability to overlap with UK time
 

Nice to have:
• Meilisearch / Algolia
• CI/CD (GitHub Actions)
• Multi-tenant systems
• Vue.js / Nuxt

What the company offers:
• Constant and interesting work with foreign clients
• Flexible working hours
• 50% cost compensation of sports, English lessons
• Annual paid 30 days vacation and paid sick days
• Medical insurance policy

Responsibilities:
• Develop and maintain backend on Laravel
• Build and support APIs and integrations
• Work on performance and scalability
• Implement queues, caching, and background jobs
• Collaborate with the team and participate in planning

We are looking for a skilled WordPress Developer to join our team and work on creating high-quality landing pages and websites. The main focus will be on building custom themes, templates, and functionalities based on WordPress — without direct integration into WooCommerce or other complex e-commerce systems.

Responsibilities:

• Develop responsive landing pages and websites using WordPress.
• Create and customize WordPress themes and templates from scratch or based on existing designs.
• Implement both front-end and back-end functionality (custom post types, taxonomies, plugins, etc.).
• Ensure cross-browser and cross-device compatibility.
• Optimize websites for speed and performance.
• Collaborate with designers and project managers to deliver high-quality results on time.

Requirements:

• 3+ years of experience in WordPress development.
• Strong proficiency in PHP, HTML5, CSS3, JavaScript/jQuery.
• Experience with WordPress theme and plugin development.
• Good understanding of WordPress core and best practices.
• Experience working with page builders (e.g., Elementor, WPBakery) is a plus.
• Basic understanding of SEO principles and website performance optimization.
• Attention to detail, responsibility, and ability to work independently.

We offer:

• Remote work with flexible working hours (part-time).
• Interesting and diverse projects.
• Competitive compensation based on skills and experience.

If you are passionate about creating clean, functional, and visually appealing websites — we’d love to hear from you!

We're looking for a QA Engineer to take ownership of quality assurance for critical backend systems in our iOS applications — from core API behavior to payment infrastructure and subscription flows.

We process subscription payments through web funnels (webview in iOS apps), so this role requires strong focus on payment systems, subscription logic, and integration reliability.

What you'll do

• Test backend APIs related to payments, subscriptions, and authentication
• Validate subscription lifecycle logic — rebilling, renewals, retries, cancellations
• Test integrations with payment systems (Stripe and similar)
• Verify webhook handling and event-driven payment workflows
• Design and execute test scenarios for critical business logic
• Perform regression testing before releases
• Test edge cases in payment flows
  (failed payments, duplicate charges, retries, cancellations)
• Analyze logs and debug backend behavior
• Collaborate closely with backend, frontend, and product teams
• When needed:
• Write automated tests (API / integration level))

Requirements

• 2+ years of commercial QA experience
• Experience testing backend systems and APIs
• Understanding of REST API testing
  (Postman, Swagger, or similar tools)
• Experience testing payment systems or financial workflows
• Understanding of subscription logic
  (subscriptions, renewals, retries, cancellations)
• Experience working with webhooks
• Ability to write clear test cases and bug reports
• Ability to analyze logs and identify root causes
• Understanding of client-server architecture
• Additional experience that will be a strong advantage:

Nice to have

Test automation experience (JavaScript / Python / Java)
Experience testing high-load systems
Experience with message queues or event-driven systems
Experience with CI/CD pipelines

We're NOT looking for

• QA engineers who only test UI
• Candidates without API testing experience
• Candidates without experience testing payment or financial logic
• People who cannot analyze root causes of failures
• Candidates without experience working with webhooks or async workflows

What we offer

• Work on a real product with direct impact on revenue
• Ownership of backend and payment systems
• Remote work and flexible schedule
• Fast product iterations without unnecessary bureaucracy
• Strong product team and engineering culture

CrunchCode — міжнародна сервісна ІТ-компанія з досвідом близько 7 років у розробці вебсервісів і вебзастосунків. Ми працюємо у форматах staff augmentation (outstaff) та outsourcing і підключаємо спеціалістів до проєктів клієнтів у довгостроковій моделі співпраці.

Ми працюємо переважно з проєктами в доменах логістики (включно з last mile),e-commerce, fintech та банкінгу, а також enterprise-рішеннями.
Для нас важливо, щоб проєкт був “чистим” і зрозумілим з точки зору етики та цінності для користувачів.

Ми принципово не беремо проєкти, пов’язані з:
● gambling / гемблінгом,
● adult-контентом та порнографією,
● шахрайством або будь-якою розробкою, що спрямована на обман чи маніпуляції.

What We Offer:
● Fully remote work
● Long-term, stable project
● High level of autonomy and trust
● Minimal bureaucracy
● Direct impact on business-critical logistics systems
● Long-term engagement, not a short-term contract.

Project Overview
Enterprise backend engineering role within a Pan-Baltic banking environment. The engineer will build and maintain cloud-native backend services on AWS, working to high standards of code quality, system reliability, and operational stability across the organization.

Tech Stack
Java 17/21, Spring Boot, REST APIs, AWS (Lambda, API Gateway, CloudWatch), CI/CD

Requirements (Must-have)
- 7+ years of practical Spring Boot development experience
- Fluent English B2+ — required for Pan-Baltic communication (spoken and written)
- Strong hands-on experience with Java 17+ / Java 21 including modern language features
- Strong experience with RESTful API design, implementation, and integration
- Proven application of clean code principles and automated testing
- Strong understanding of SOLID, KISS, YAGNI design principles
- Experience with cloud-based and distributed systems, AWS in particular
- Hands-on experience with AWS: Lambda (Java runtime), API Gateway, CloudWatch
- Strong CI/CD practices and monitoring/operational stability techniques

Responsibilities:
- Build and maintain backend services using Spring Boot
- Design and implement RESTful APIs and integrations
- Work with AWS serverless and cloud infrastructure (Lambda, API Gateway, CloudWatch)
- Apply clean code principles and write maintainable, well-tested code
- Implement and support CI/CD pipelines and monitoring practices
- Ensure operational stability and system reliability in a distributed environment
- Apply SOLID, KISS, and YAGNI principles across the codebase

Nice to Have:
- Experience in banking or financial services domain
- Familiarity with compliance and security standards in enterprise environments

Hiring Process:
- Intro call
- Technical discussion
- Offer
Start: ASAP

He there! We're looking for a strong backend / fullstack developer.

In our projects we are using the following stack:

• PHP
• JavaScript
• MySql
• Solr
• ElasticSearch
• RestFull API
• Vue
• Git

We welcome experience in API development, experience with mapping services (Roads API, Routes, etc.), and integration of payment services.

If you don't have experience in something, don't worry—the main thing is to have a solid foundation and a desire to learn everything.

We work on large projects, both our own and our clients', and often use our own framework, which uses PHP on the backend. That's why we need a strong mid-level developer for long-term cooperation.

We are considering remote full-time work, and in some cases, we may consider stable part-time work.

We are looking for an enthusiastic and proactive Intern .NET + Angular Developer to join our dynamic team!

Requirements:
— Solid understanding of object-oriented programming (OOP);
— Good knowledge of C#, .Net Standard, .NET 6+, ASP Web API;
— Basic knowledge of Unit testing;
— Basic knowledge of MSSQL;
— Knowledge of Angular(React) + TypeScript;
— Upper-Intermediate English level (both written and spoken);
— Proficiency with Source Control tools such as Git.

Would be a plus:
— Basic understanding of GoF Design Patterns;
— Understanding of microservice architecture;
— Containerization (basics of Docker/Kubernetes) + Azure;
— Attention to details;
— Practice experience in pet projects.

Responsibilities:
— Develop project functionalities;
— Manage databases with MS SQL;
— Implement frontend features with Angular.

We offer:
— 3-month Internship schedule: Monday to Friday, 10.00-19.00;
— Office-based/remote work;
— No time trackers or other bureaucratic measures;
— Practical experience on internal projects;
— Networking with experienced professionals willing to share their knowledge and experience;
— Opportunity to obtain a contract with HYS Enterprise as a Junior specialist;
— Gifts for birthdays and professional holidays;
— Participation in internal and external events.
Upon successful completion of the internship and mutual agreement to proceed with a contract, the candidate is expected to commit to working with us for a minimum of one year.

About the project
 

US-founded media company operating email newsletters at scale – millions of subscribers across finance, health, and business verticals. Small engineering team, flat structure, direct ownership, fast iteration. No layers of approval, no large org to navigate.

You'll own the AI layer of the automation platform alongside a counterpart engineer who handles integration and infrastructure.
 

What you'll work on

• AI-driven content generation and management workflows at production scale
• Agent systems coordinating multi-step operational tasks: content, QA, validation, reporting
• RAG pipelines over internal knowledge bases and operational data
• Prompt architectures designed for reliability, cost control, and measurable output quality
• Evaluation and regression testing for LLM systems — "it looked fine when I tested it" isn't good enough
   

Real production systems, not demos. The work removes hours of manual operational work daily and needs to be reliable enough that people actually trust it.
 

Requirements

• 6+ years of development experience
• 4+ years of production Python
• 2+ years shipping production systems with LLMs and agents
• Solid understanding of what happens underneath the frameworks: tokenization, context windows, function calling, when RAG helps and when it doesn't
• Hands-on with agent orchestration: LangChain, LangGraph, MCP, or equivalent
• Clean, maintainable Python – frameworks support your thinking, not replace it
   

Tech stack

Python · FastAPI · PostgreSQL · LLM APIs (OpenAI, Anthropic) · LangChain / LangGraph / MCP · vector databases · Playwright · Docker · proxy infrastructure
 

Conditions

• B2B contract, full-time
• Warsaw office (onsite preferred, remote considered)
• Direct collaboration with technical PM and small senior team
• Fast-moving environment: ambiguity, shifting priorities, growing scope

Data Science UA is a service company with deep expertise in AI and Data Science. Our story started in 2016 with the first Data Science UA Conference in Kyiv, and since then, we’ve built one of the largest AI communities in Europe.

About the client:
The company is on a mission to make the world’s industrial environments safer with technology solutions and to drive a paradigm shift in safety from reactive to proactive approaches to reduce the risk of industrial accidents. The team in Ukraine is developing the future of industrial safety based on machine learning, computer vision, and IoT.

About the role: 
We are looking for a Software Engineer to build high-throughput data pipelines and shared memory infrastructure. In this role, you will work with Python (3.11+) and ZeroMQ focusing on low-latency IPC, efficient memory management, and scaling our real-time processor ecosystem.

Responsibilities:
- Develop and optimize the Pipeline Engine (Python DAG orchestrator).
- Maintain shared memory pools (C library + Python/Go bindings).
- Manage the ZeroMQ IPC layer and FlatBuffers metadata serialization.
- Enhance the ProcessorWrapper infrastructure.

Must-have:
- Senior-level Python 3.11+: Deep understanding of concurrency, multiprocessing, GIL behavior, and memory management.
- Linux Systems Programming: Hands-on experience with /dev/shm, process isolation, file descriptors, and signals.
- Docker: Proficiency in containerized environments.

Nice to have:
- CUDA Basics: Experience with GPU memory management (IPC handles, stream sync, CPU↔GPU transfers).
- C/C++: Knowledge of POSIX shm, lock-free structures (atomic CAS), and pybind11/ctypes bindings.
- ZeroMQ & FlatBuffers: Familiarity with PUSH/PULL, PUB/SUB patterns, and zero-copy schema design.
- Computer Vision: Experience with OpenCV or CV-CUDA (nvcv).
- Optimization & RPC: Interest in TensorRT (YOLO optimization) and Connect RPC (Buf ecosystem).
- Domain Expertise: Background in building developer tools for ML pipelines, robotics, or real-time video systems.

The client offers:
- Good compensation;
- Benefit package;
- Strong team and career growth;
- Challenges every day!

e’re building a product that helps companies reduce costs when using AI (like ChatGPT / Claude).

👉 Instead of calling AI APIs directly, requests go through our system.
We optimize and compress them, so businesses spend less on tokens.

The system is built on Cloudflare Workers (edge computing) — fast, scalable, and designed for high load.

🚀 What you’ll do

• Build backend logic using Cloudflare Workers (Node.js / TypeScript)
• Work with Cloudflare D1 (serverless database) and Hyperdrive
• Improve performance, latency, and cost efficiency of API requests
• Develop a system handling real-time, high-volume traffic
• Participate in architecture and technical decisions

🧠 Requirements

• 4+ years of backend development experience
• Strong experience with Node.js / TypeScript
• Hands-on with Cloudflare Workers
• Experience with Cloudflare D1
• Experience with Cloudflare Hyperdrive
• English level B1+

➕ Nice to have

• Experience with LLM APIs (OpenAI, Anthropic, etc.)
• Understanding of token usage / API cost optimization
• Background in B2B SaaS / API platforms / developer tools

⚙️ Details

• Full-time, 10–12 months
• Remote
• Start in 3–4 weeks
• B2B collaboration