Senior Fullstack Engineer - AI

iFindTech Ltd; Amsterdam; On-site; EUR 75,000 - 110,000; Full time

Job summary

iFindTech Ltd is seeking a Senior Fullstack Engineer to build production AI features end-to-end. You will work across React and TypeScript on the frontend and Python and FastAPI on the backend, taking features from idea to production.

Expect to handle APIs, data, LLM integrations, streaming interfaces, and document-heavy UIs with ownership over architecture and product direction. You’ll contribute to building modern interfaces and robust APIs, collaborate across teams, and thrive in a

Qualifications

• 5+ years building and shipping fullstack applications
• React – 5+ years
• TypeScript – 3+ years
• Python / FastAPI – 3+ years
• Strong experience building and designing production APIs
• PostgreSQL
• Redis – 2+ years
• Experience building modern, high-quality user interfaces
• Comfortable owning features end to end – backend through to frontend
• Experience using AI coding tools such as Claude Code, Cursor or Copilot
• Comfortable working in a fast-moving startup environment

Skills

Fullstack development

React

TypeScript

Python/FastAPI

API design

PostgreSQL

Redis

AI coding tools

Tools

Next.js

React Query

Zustand

Tailwind CSS

shadcn/ui

LangChain

LlamaIndex

WebSockets

Job description

We’re working with a fast-growing AI company looking for a Senior Fullstack Engineer to build production AI features end to end. You’ll work across React & TypeScript on the frontend and Python & FastAPI on the backend, taking features all the way from idea through to production. Expect to work on everything from APIs, data and LLM integrations through to streaming interfaces and document-heavy UIs. This is a hands-on role with real ownership, where you’ll help shape both the architecture and the product as the company scales.

Must Haves

• 5+ years building and shipping fullstack applications
• React – 5+ years
• TypeScript – 3+ years
• Python / FastAPI – 3+ years
• Strong experience building and designing production APIs
• PostgreSQL
• Redis – 2+ years
• Experience building modern, high-quality user interfaces
• Comfortable owning features end to end – backend through to frontend
• Experience using AI coding tools such as Claude Code, Cursor or Copilot
• Comfortable working in a fast-moving startup environment

Nice to Haves

• Experience building products involving LLMs, RAG or AI agents
• Next.js
• React Query
• Zustand
• Tailwind CSS
• shadcn/ui
• LangChain or LlamaIndex
• SSE / WebSockets and streaming applications
• Experience building document-heavy or real-time interfaces
• Genuine interest in AI engineering and agentic applications