Lead Full-Stack Software Engineer

EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.
We're seeking a Lead Full-Stack Software Engineer to build user-friendly, high-performing interfaces and frontend integration libraries that deliver GenAI and intelligent automation capabilities to teams across IT, HR, Finance, Sales, Marketing, and Customer Support.
Responsibilities
Design and develop end-to-end GenAI-powered applications, emphasizing intuitive web-based UIs and high-performing client-side API integrations
Build responsive, accessible frontend interfaces tailored for streaming responses and minimal latency
Create and maintain a library of reusable frontend components, hooks, and design systems for enterprise-grade GenAI applications
Deliver LLM-based experiences using frameworks such as LangChain or LlamaIndex combined with OpenAI, Claude, or Gemini
Collaborate with designers and product managers to rapidly iterate on innovative AI UX patterns, including chat assistants, prompt builders, and feedback loops
Ensure security, accessibility, observability, and comprehensive test coverage across client-side and full-stack builds
Deliver responsive, accessible, and high-performance web UIs suited to AI-driven interactions such as streaming text, prompt inputs, citations, and summaries
Maintain a shared library of reusable frontend components and hooks so internal teams can seamlessly integrate GenAI capabilities into their own applications
Develop UI components that provide transparency, observability, and trust in AI-generated outputs
Requirements
Background in building production applications with React, TypeScript, or Vue for enterprise use cases (5+ years)
Expertise in full-stack software engineering spanning frontend UIs, REST APIs, and microservices (5–8 years)
Proficiency in integrating GenAI features, LLM APIs, and prompt UI patterns into web-based applications (2+ years)
Skills in Python backend development, along with 2+ years building and consuming cloud microservices on AWS, Docker, and REST APIs
Showcase of building, documenting, and maintaining reusable component libraries, design systems, and custom hooks
Proficiency in English at a B2+ level or higher
Nice to have
Familiarity with real-time streaming UX patterns, such as SSE/WebSockets, prompt builders, citations, and summary UI components
Knowledge of WCAG 2.1 AA compliance and approaches to designing accessible UI components
Capability to work with client-side or Node.js LangChain, LangGraph, or LlamaIndex orchestration
Understanding of RAG pipelines, vector search platforms like Pinecone or OpenSearch, and embedding fundamentals
Competency in AI evaluation tools, feedback loop design, and interface-level guardrails
We offer
International projects with top brands
Work with global teams of highly skilled, diverse peers
Healthcare benefits
Employee financial programs
Paid time off and sick leave
Upskilling, reskilling and certification courses
Unlimited access to the LinkedIn Learning library and 22,000+ courses
Global career opportunities
Volunteer and community involvement opportunities
EPAM Employee Groups
Award-winning culture recognized by Glassdoor, Newsweek and LinkedIn
EPAM is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, sexual orientation, gender identity or expression, disability, protected veteran status, or any other characteristic protected by applicable law.

Work arrangement
Yes