We are hiring a Senior Full Stack Software Engineer to build fast, intuitive web interfaces and frontend integration libraries for GenAI and intelligent automation. You will deliver accessible, low-latency UI patterns and reusable components while connecting to LLM APIs and cloud microservices.

Responsibilities

- Design and deliver end-to-end GenAI-powered applications with an emphasis on intuitive web UIs and efficient client-side API integrations

- Build responsive, accessible frontend experiences optimized for streaming responses and low latency

- Develop and maintain reusable frontend component libraries, hooks, and design systems for enterprise GenAI apps

- Implement LLM-driven experiences using frameworks such as LangChain or LlamaIndex together with OpenAI, Claude, or Gemini

- Collaborate with designers and product managers to iterate quickly on AI UX patterns like chat assistants, prompt builders, and feedback loops

- Ensure security, accessibility, observability, and robust test coverage across client-side and full-stack work

- Create high-performance, accessible web UIs for AI interactions including streaming text, prompt inputs, citations, and summaries

- Maintain shared libraries of reusable frontend components and hooks to help internal teams embed GenAI capabilities into their applications

- Build UI components that provide transparency, observability, and trust in AI-generated outputs

Requirements

- 3+ years of experience building production apps with React, TypeScript, or Vue for enterprise use cases





- Solid full-stack software engineering background across frontend UIs, REST APIs, and microservices

- Practical experience integrating GenAI features, LLM APIs, and prompt UI patterns into web-based applications

- Strong Python backend skills, plus experience building and consuming cloud microservices on AWS, Docker, and REST APIs

- Proven track record creating, documenting, and maintaining reusable component libraries, design systems, and custom hooks

- English proficiency at a B2+ level (Upper-Intermediate) 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 for architecting accessible UI components

- Practical experience 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 integral 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

📌 Senior Full Stack Software Engineer (Argentina)
🏢 EPAM Systems
📍 Argentina