Lead Full Stack Software Engineer

EPAM Systems; Colombia; On-site; COP 120,000,000 - 180,000,000; Full time

Benefits offered by this job

Healthcare benefits

Employee financial programs

Paid time off and sick leave

Upskilling, reskilling and certificates

Job summary

EPAM Systems seeks a Lead Full Stack Software Engineer to design GenAI-powered applications with intuitive UIs and robust frontend integration libraries. You will implement streaming, low-latency frontends and reusable components to enable enterprise GenAI capabilities across IT, HR, Finance, Sales, Marketing and Support.

The role requires 5+ years in React/TypeScript/Vue and strong backend experience in Python, AWS, Docker, and REST APIs, plus experience with LangChain or LlamaIndex.

Qualifications

• 5+ years building enterprise web applications using modern frontend tech.
• 5–8 years software engineering across the full web stack, including UIs, APIs and microservices.
• 2+ years integrating GenAI features and prompt UI patterns into web apps.
• Strong Python backend development with 2+ years on AWS, Docker and REST APIs.
• Proven track record of reusable component libraries and design systems.
• Proficiency in English at a B2+ level.

Responsibilities

• Design and build end-to-end GenAI-powered applications with intuitive UIs.
• Develop responsive frontend interfaces for streaming responses and low latency.
• Create reusable frontend components and design systems for enterprise GenAI apps.
• Implement LLM-based experiences using LangChain or LlamaIndex with major providers.
• Collaborate with designers and PMs to iterate AI UX patterns.

Skills

React

TypeScript

Vue

GenAI integration

English (B2+)

Tools

AWS

Docker

REST APIs

OpenAI API

LangChain

LlamaIndex

Job description

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 are seeking a Lead Full Stack Software Engineer to build intuitive, performant user interfaces and frontend integration libraries that make GenAI and intelligent automation accessible and useful across IT, HR, Finance, Sales, Marketing, and Customer Support.

Responsibilities

• Design and build end-to-end GenAI-powered applications, emphasizing intuitive web-based UIs and performant client-side API integrations
• Develop responsive, accessible frontend interfaces engineered for streaming responses and low latency
• Build and maintain a library of reusable frontend components, hooks, and design systems for enterprise GenAI applications
• Implement LLM-based experiences using frameworks like LangChain or LlamaIndex with OpenAI, Claude, or Gemini
• Collaborate with designers and product managers to iterate rapidly on novel AI UX patterns such as chat assistants, prompt builders, and feedback loops
• Ensure security, accessibility, observability, and test coverage across client-side and full-stack implementations
• Create responsive, accessible, and high-performance web UIs tailored for AI-driven interaction patterns like streaming text, prompt inputs, citations, and summaries
• Maintain a shared library of reusable frontend components and hooks that enable internal teams to drop GenAI capabilities into their applications
• Deliver UI components that provide transparency, observability, and confidence in AI-generated outputs

Requirements

• 5+ years of production experience with React, TypeScript, or Vue for enterprise web applications
• 5–8 years of software engineering experience across the full web stack, including frontend UIs, REST APIs, and microservices
• 2+ years of experience integrating GenAI features, LLM APIs, and prompt UI patterns into web applications
• Strong Python backend development skills and 2+ years of experience consuming and building cloud microservices on AWS, Docker, and REST APIs
• Proven experience building, documenting, and maintaining reusable component libraries, design systems, and custom hooks
• Proficiency in English at a B2+ level

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 accessible UI component architecture
• Skills in client-side or Node.js LangChain, LangGraph, or LlamaIndex orchestration
• Familiarity with RAG pipelines, vector search tools like Pinecone or OpenSearch, and embedding concepts
• Background in AI evaluation tooling, feedback loops, and guardrails in user interfaces

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.