Senior Python Developer (AI, React, Java)

We are looking for a highly skilled Senior Python Developer. In this role, you will design, build, and deploy the next generation of our intelligent agent infrastructure. You will focus on building robust backend agent workflows, setting up high-performance streaming protocols for user-agent interaction, and ensuring seamless deployment at scale using GitOps. Our ideal candidate is passionate about the evolving AI ecosystem, deeply comfortable with asynchronous programming in Python, and experienced in bringing complex agentic workflows into production.

Kindly note that this role supports remote work, but only from within Ukraine.

Responsibilities

• Agent Backend Development: Design, optimize, and maintain complex multi-agent state machines, graphs, and tool-calling systems using FastAPI and LangGraph
• AI Model Integration: Orchestrate and configure model access, prompt routing, and vector store integrations using the LangChain ecosystem
• Agent-to-UI Streaming: Implement and scale the CopilotKit Python runtime to establish bidirectional, real-time communication protocols between backend agents and frontend client components
• Integration & Interoperability: Build and implement standard interfaces for tool/data integrations using the Model Context Protocol (MCP) to allow external services to connect smoothly with our agent ecosystems
• Production Deployment: Package backend services into Docker containers and orchestrate deployments across Kubernetes clusters using Helm charts and GitOps CD engines like ArgoCD
• Performance & Reliability: Write clean, performant, and heavily asynchronous Python code (asyncio) capable of handling complex parallel tasks, high-concurrency streaming, and model callbacks
  
  

Requirements

• Core Language: Strong expertise in Python 3.11+, with deep knowledge of asynchronous programming (asyncio, uvicorn, anyio)
• AI/Agent Frameworks: Hands-on experience building stateful, multi-agent systems using LangGraph and utilizing LangChain for abstracting LLM runtimes, memory, and output parsing
• Proven experience with FastAPI (WebSockets, Background Tasks, SSE streaming)
• Direct experience or strong familiarity with the CopilotKit Python SDK / runtime for co-agent interactions
• Practical, working knowledge of the Model Context Protocol (MCP) for building standardized tool integration servers
• Docker containerization best practices (multi-stage builds, security pinning)
• Container orchestration with Kubernetes (writing/modifying Helm charts)
• Strong exposure to GitOps workflows and continuous deployment using ArgoCD
  
  

Nice to have

• 1+ year of experience with Java
• Experience with vector databases (e.g., Pinecone, Milvus, Qdrant, PGVector)
• Understanding of frontend integration concepts (e.g., React, Next.js, and how CopilotKit hooks interact with the frontend components)
• Contributions to open-source AI frameworks (LangChain, LangGraph, CopilotKit, or MCP servers)
• Familiarity with distributed tracing for LLM applications (e.g., LangSmith, Phoenix, or Arize)
  
  

We offer

• With us you can:
• Work on a flexible schedule remotely or from any of our comfortable offices or coworking spaces in Ukraine
• Receive the necessary equipment to perform your work tasks
• Change projects and technology stacks within EPAM
• Gain experience in various business domains (Insurance, E-commerce, Healthcare, Finance, Travelling, Media, Artificial Intelligence, and more)
• Relocation opportunities may be available for eligible candidates, depending on the role and openings at other EPAM locations
• Participate in volunteer, charity programs and communities (both technical and interest-based)
• We focus on your professional growth:
• You can plan your individual career path together with your manager
• Receive regular feedback from colleagues
• Improve your English for free with certified teachers (Speaking Clubs, client interview preparation courses, etc.)
• Get the opportunity to undergo free training and certification in AWS, GCP, or Azure Clouds
• Use the internal E-learn training program (18,200+ specialized training and mentoring programs)
• Access corporate accounts on LinkedIn Learning, Get Abstract and other partner resources
• Study at EPAM Solution Architecture School with the instructors who are practicing architects
• Develop as a leader, join Delivery Management, Resource Management, Leadership Essentials school and more
• Participate in internal communities (500+ meetups, technical discussions, brainstorming sessions, online events and conferences annually)
• What we offer:
• Vacation and sick leave (including a sick leave without a medical certificate)
• A wide range of Voluntary Medical Insurance programs providing both medical treatment and various preventive options (including sports activities)
• Medical insurance for family members at corporate rates
• Company support during significant life events (childbirth or adoption, marriage, etc.)
• Support for psychological comfort: discounts on services from mental health specialists or coaches, thematic training
• E-kids program - a free programming language training program for EPAMers' children
  

Kindly be advised that the set of benefits, including learning, certification, and other opportunities, may vary depending on the role you apply for. Our recruiter will be able to share more details about the specific opportunity during your general interview.

EPAM strives to provide its global team of over 62,350 professionals in more than 55 countries with opportunities for professional growth from day one of collaboration. Our colleagues are the source of EPAM's success, so we value cooperation, strive to always understand our clients' business and aim for the highest quality standards. No matter where you are, you will join a dedicated, diverse community that will help you realize your potential to the fullest.