Senior AI Engineer - React & LLM, Remote

EPAM Systems; Georgia; On-site; USD 120,000 - 180,000; Full time

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Job summary

EPAM Systems is seeking a Senior AI Engineer with strong expertise in ReactJS and Python to join our team and help build, debug, and scale intelligent applications powered by LLMs and agent-based architectures.

The role blends backend engineering with frontend quality, requiring you to trace issues across the full stack from UI rendering to agent reasoning failures, while enabling remote work from anywhere in Georgia.

Qualifications

• 5+ years of experience with Python, FastAPI, and asynchronous programming patterns.
• Proficiency in agent frameworks such as pydantic-ai, LangGraph, or LangChain, with hands-on experience in prompt engineering and tool-calling.
• Expertise in RAG systems, including chunking, embeddings, and vector search tools such as Qdrant or pgvector.
• Skills in React (hooks) and CSS, with the ability to build and troubleshoot complex, responsive UIs.
• Understanding of concurrency and state management, with experience implementing request-scoped state, locks, and thread-safety.
• Familiarity with Docker and Kubernetes, including container management and deployment debugging.
• Background in testing practices using pytest and vitest, with consistent use of mocks and fixtures.
• Strong debugging skills with the ability to trace issues across frontend, backend, and agent layers

Responsibilities

• Design and build async endpoints, background tasks, and streaming responses using Python and FastAPI.
• Develop and maintain agent-based systems, including prompt design, tool-calling, and RAG pipelines.
• Diagnose and resolve LLM failure modes such as hallucination, context contamination, and non-deterministic output.
• Tune retrieval quality through chunking strategies, embeddings, and vector search optimization.
• Build and fix production-grade React UIs, including layout, responsive behavior, and streaming state management.
• Identify and resolve concurrency issues, including shared mutable state and callback bleed under concurrent requests.
• Operate within Docker and Kubernetes environments, including deployment and pod/log debugging.
• Write and maintain test coverage using pytest and vitest, including mocks and fixtures.
• Trace symptoms to root causes across frontend, backend, and agent layers to ensure system reliability.

Skills

Python

FastAPI

Asynchronous programming

ReactJS

LangChain

pydantic-ai

LangGraph

LLM prompt engineering

Qdrant

pgvector

Docker

Kubernetes

pytest

vitest

Tools

GitHub Actions

Qdrant

pgvector

Docker

Kubernetes

pytest

vitest

Job description

EPAM Systems is seeking a Senior AI Engineer with strong expertise in ReactJS and Python to join our team and help build, debug, and scale intelligent applications powered by LLMs and agent-based architectures.

The role blends backend engineering with frontend quality, requiring you to trace issues across the full stack from UI rendering to agent reasoning failures, while enabling remote work from anywhere in Georgia.