Lead Full Stack Software Engineer

EPAM Systems; Argentina; On-site; ARS 181,906,000 - 242,542,000; Full time

Benefits offered by this job

Healthcare benefits

International projects

Employee financial programs

Paid time off and sick leave

Upskilling and certification courses

LinkedIn Learning access

Global career opportunities

Volunteer and community involvement

EPAM Employee Groups

Award-winning culture

Job summary

EPAM Systems in Argentina is seeking a Lead Full Stack Software Engineer to build GenAI‑powered applications, delivering intuitive web UIs and scalable client-side integrations. You will craft reusable frontend components and design systems, leverage LangChain or LlamaIndex with OpenAI, and collaborate with design and product teams to iterate AI UX.

Requirements include 5+ years with React/TypeScript or Vue, 5–8 years full-stack experience, 2+ years GenAI and cloud experience (AWS, Docker,

Qualifications

• 5+ years building production applications with React, TypeScript, or Vue for enterprise use cases.
• 5–8 years of full-stack software engineering experience spanning frontend UIs, REST APIs, and microservices.
• 2+ years integrating GenAI features, LLM APIs, and prompt UI patterns into web-based applications.
• Solid Python backend skills, with 2+ years building and consuming cloud microservices on AWS, Docker, and REST APIs.
• Experience building reusable component libraries, design systems and custom hooks.
• English proficiency at a B2+ level or higher.

Responsibilities

• Architect and develop GenAI-powered applications with intuitive web-based UIs and client-side integrations.
• Craft responsive frontend interfaces designed for streaming responses and low latency.
• Build a library of reusable components, hooks and design systems for GenAI apps.
• Bring LLM-based experiences to life using LangChain or LlamaIndex with OpenAI, Claude, or Gemini.
• Collaborate with designers and product managers to iterate on AI UX patterns and prompts.
• Ensure security, accessibility, observability and test coverage across client-side and full-stack builds.
• Produce high-performance UIs for AI-driven interactions like streaming text and summaries.
• Maintain a shared component library for internal teams to integrate GenAI features.
• Develop UI components that offer transparency and trust in AI outputs.

Tools

LangChain

LlamaIndex

OpenAI

Claude

Gemini

Job description

We're looking for a Lead Full Stack Software Engineer to create user-friendly, high-performing interfaces and frontend integration libraries that bring GenAI and intelligent automation capabilities to teams across IT, HR, Finance, Sales, Marketing, and Customer Support.

Responsibilities

• Architect and develop complete GenAI-powered applications, with a focus on intuitive web-based UIs and high-performing client-side API integrations
• Craft responsive, accessible frontend interfaces designed for streaming responses and minimal latency
• Construct and sustain a library of reusable frontend components, hooks, and design systems for enterprise-grade GenAI applications
• Bring LLM-based experiences to life using frameworks such as LangChain or LlamaIndex paired with OpenAI, Claude, or Gemini
• Partner with designers and product managers to quickly iterate on innovative AI UX patterns, including chat assistants, prompt builders, and feedback loops
• Guarantee security, accessibility, observability, and thorough test coverage throughout client-side and full-stack builds
• Produce responsive, accessible, and high-performance web UIs suited to AI-driven interactions like streaming text, prompt inputs, citations, and summaries
• Sustain a shared library of reusable frontend components and hooks so internal teams can easily integrate GenAI capabilities into their own applications
• Build UI components that offer transparency, observability, and trust in AI-generated outputs

Requirements

• 5+ years building production applications with React, TypeScript, or Vue for enterprise use cases
• 5–8 years of full-stack software engineering experience spanning frontend UIs, REST APIs, and microservices
• 2+ years integrating GenAI features, LLM APIs, and prompt UI patterns into web-based applications
• Solid Python backend skills, along with 2+ years building and consuming cloud microservices on AWS, Docker, and REST APIs
• Demonstrated track record building, documenting, and maintaining reusable component libraries, design systems, and custom hooks
• English proficiency at a B2+ level or higher

Nice to have

• Experience with real-time streaming UX patterns, including SSE/WebSockets, prompt builders, citations, and summary UI components
• Understanding of WCAG 2.1 AA compliance and how to architect accessible UI components
• Hands-on skills with client-side or Node.js LangChain, LangGraph, or LlamaIndex orchestration
• Exposure to RAG pipelines, vector search platforms like Pinecone or OpenSearch, and embedding fundamentals
• Experience with 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