Lead Full-Stack Software Engineer

EPAM Systems, Inc.; United States; Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

Healthcare benefits

Paid time off

Upskilling & certifications

LinkedIn Learning access

Global career opportunities

Job summary

EPAM Systems, Inc. is seeking a Lead Full-Stack Software Engineer to build high-performing, user-friendly interfaces and frontend integration libraries for GenAI and intelligent automation across departments.

You will architect end-to-end GenAI-powered apps, emphasizing responsive web UIs and low-latency client-side integrations. You will collaborate with product teams to iterate on AI UX patterns, including chat assistants, prompt builders, and feedback loops, while ensuring security,

Qualifications

• 5+ years in building production React/TypeScript or Vue-based enterprise applications.
• 5–8 years of full-stack experience across frontend UIs, REST APIs, and microservices.
• 2+ years integrating GenAI features and prompt UI patterns into web apps.

Responsibilities

• Design and develop GenAI-powered applications with intuitive UIs.
• Build and maintain reusable frontend components and design systems.
• Implement LLM-based experiences using LangChain or LlamaIndex with OpenAI, Claude, or Gemini.
• Ensure security, accessibility, observability, and test coverage for client-side and full-stack builds.

Skills

React

TypeScript

Vue

REST APIs

Tools

AWS

Docker

LangChain

LlamaIndex

Job description

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.ResponsibilitiesDesign and develop end-to-end GenAI-powered applications, emphasizing intuitive web-based UIs and high-performing client-side API integrationsBuild responsive, accessible frontend interfaces tailored for streaming responses and minimal latencyCreate and maintain a library of reusable frontend components, hooks, and design systems for enterprise-grade GenAI applicationsDeliver LLM-based experiences using frameworks such as LangChain or LlamaIndex combined with OpenAI, Claude, or GeminiCollaborate with designers and product managers to rapidly iterate on innovative AI UX patterns, including chat assistants, prompt builders, and feedback loopsEnsure security, accessibility, observability, and comprehensive test coverage across client-side and full-stack buildsDeliver responsive, accessible, and high-performance web UIs suited to AI-driven interactions such as streaming text, prompt inputs, citations, and summariesMaintain a shared library of reusable frontend components and hooks so internal teams can seamlessly integrate GenAI capabilities into their own applicationsDevelop UI components that provide transparency, observability, and trust in AI-generated outputsRequirementsBackground 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 APIsShowcase of building, documenting, and maintaining reusable component libraries, design systems, and custom hooksProficiency in English at a B2+ level or higherNice to haveFamiliarity with real-time streaming UX patterns, such as SSE/WebSockets, prompt builders, citations, and summary UI componentsKnowledge of WCAG 2.1 AA compliance and approaches to designing accessible UI componentsCapability to work with client-side or Node.js LangChain, LangGraph, or LlamaIndex orchestrationUnderstanding of RAG pipelines, vector search platforms like Pinecone or OpenSearch, and embedding fundamentalsCompetency in AI evaluation tools, feedback loop design, and interface-level guardrailsWe offerInternational projects with top brandsWork with global teams of highly skilled, diverse peersHealthcare benefitsEmployee financial programsPaid time off and sick leaveUpskilling, reskilling and certification coursesUnlimited access to the LinkedIn Learning library and 22,000+ coursesGlobal career opportunitiesVolunteer and community involvement opportunitiesEPAM Employee GroupsAward-winning culture recognized by Glassdoor, Newsweek and LinkedIn