Senior Fullstack Developer

Who are we? At Newcode.ai, we're on a mission to reshape how organizations put AI to work in their day-to-day operations. In few months, we've moved from vision to reality—building products our clients truly love. As part of our fast-growing and highly ambitious team, you won't just drive the future of AI—you'll help define it.

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. You should be at home in a Celery task and in a React component, and able to handle routine work on either side without waiting for a specialist to unblock you.

Requirements What You'll Do

• 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. Depth matters more to us than the number.
• Comfortable on both sides for real: you can design a clean API and build a good UI on top of it.
• You care how it turns out: readable code, a UI that feels right, an architecture you'd defend.
• You 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.

Visa Sponsorship: At this time, Newcode is unable to provide visa sponsorship. Candidates must be authorized to work in the applicable country without employer sponsorship.

Benefits 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