Remote Senior TypeScript Backend Engineer — AI & LLMs

Darwin Recruitment; Paris; Remote; EUR 92,000 - 148,000; Part time

Job summary

Darwin Recruitment is seeking a freelance Senior TypeScript Backend Engineer for a 3-month contract, remote across Europe. You will design, build and iterate backend features end to end, focusing on scalable APIs and AI-powered capabilities built on LLMs and agentic workflows.

Ideal candidates bring senior-level TypeScript backend expertise (Node.js, NestJS/Express or Fastify), strong production-grade delivery experience, and a solid grasp of API design and system integration in fast-paced

Qualifications

• Senior-level, hands-on TypeScript backend experience.
• Production-grade delivery from concept to release.
• Strong API design and system integration experience.

Responsibilities

• Design, build and iterate on backend features end to end.
• Focus on backend services and AI-powered capabilities built on LLMs.
• Collaborate with product and engineering teams in a fast-paced environment.

Skills

TypeScript backend

Node.js

NestJS

Express

API design

LLMs/AI

AI agent framework

Tools

NestJS

Express

Fastify

Job description

Darwin Recruitment is seeking a freelance Senior TypeScript Backend Engineer for a 3-month contract, remote across Europe. You will design, build and iterate backend features end to end, focusing on scalable APIs and AI-powered capabilities built on LLMs and agentic workflows.

Ideal candidates bring senior-level TypeScript backend expertise (Node.js, NestJS/Express or Fastify), strong production-grade delivery experience, and a solid grasp of API design and system integration in fast-paced