Freelance Fullstack Engineer React / Node.js - Freelance

Context

Collective.work is building the next generation of AI-powered recruitment. The company supports over 20,000 recruiters and headhunters across France, Belgium, Spain, and EMEA, and is expanding its product and distribution in the UK. The platform combines a suite of AI agents — from sourcing and outreach to job posting and ATS integrations — with a database of 800M+ professional profiles and a network of 1M+ active candidates.

Missions

• Build and ship product features across the React frontend and Node.js backend.

• Develop scalable APIs, backend services, and integrations with third-party tools, including ATS platforms.

• Integrate AI-powered capabilities into intuitive, high-performance user experiences.

• Improve application performance, reliability, and code quality.

• Collaborate closely with product and engineering teams to deliver features from conception to production.

Tools & Environment

• React

• Node.js

• JavaScript/TypeScript

• AI APIs and LLM integrations (plus)

• ATS platform integrations

Working Conditions

• Location: Madrid, Spain

• Type: Freelance / Contract

• Start date: ASAP

• Duration and day rate: To be agreed