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Jobs · Engineering · New York

Senior Fullstack Developer

Newcode.ai · New York, NY · 1 mo ago
HybridEngineeringFull-time

About the role

You'll build features the whole way through: the FastAPI service and data work on the back, the React interface on the front. Most of what we build puts a language model in front of someone doing real work, so a typical feature might mean wiring up retrieval and an LLM call on the backend, then building the streaming, document-heavy UI that makes it usable. We want someone who can carry a feature from idea to production without handing it over a wall.

Requirements

  • Building AI features end to end, API through UI.
  • Making models usable: streaming responses, real-time updates, and interfaces that handle a lot of documents without feeling slow.
  • Owning quality and architecture on both sides of a feature.
  • Pulling in our frontend or backend specialists when something needs real depth, and handling the rest yourself.

Who You Are

  • At least five years building and shipping fullstack work.
  • Comfortable on both sides for real: you can design a clean API and build a good UI on top of it.
  • Care about how it turns out: readable code, a UI that feels right, an architecture you'd defend.
  • Use AI coding tools (Claude Code, Cursor, Copilot) and use them well. They make you faster; they don't write code you don't understand, and you wouldn't pass sloppy AI output in review.
  • Keen to go deeper on LLMs, RAG, and agents.
  • Fine working in a startup that shifts under you.

Experience We Expect With The Stack

  • React: 5+ years
  • TypeScript: 3+ years
  • FastAPI / Python: 3+ years
  • PostgreSQL Redis: 2+ years
  • Tailwind CSS: 1+ year

Nice to have

  • Next.js, React Query, Zustand, shadcn/ui;
  • LangChain or LlamaIndex;
  • streaming over SSE or WebSocket.

Benefits

  • Join a collaborative, high-energy team where your ideas are heard and your impact is real.
  • Help design, build, and launch products shaping the future of artificial intelligence.
  • Work flexibly, in English, from anywhere in the EU.

Why Newcode.ai?

Join a collaborative, high-energy team where your ideas are heard and your impact is real
Help design, build, and launch products shaping the future of artificial intelligence
Work flexibly, in English, from anywhere in the EU

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