Job description 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

Requirements
1. Strong experience with React, Node.js, and JavaScript/TypeScript
2. Solid understanding of API design, backend architecture, and database integration
3. Experience building and maintaining production-grade web applications
4. Familiarity with AI APIs, LLM integrations, or AI-powered products is a plus
5. A proactive, product-minded engineer who enjoys taking ownership and shipping quickly

📌 Freelance Fullstack Engineer React / Node.js - Freelance (Madrid)
🏢 Collective.work
📍 Madrid