Freelance Fullstack Engineer React / Node.js - Freelance

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: London, UK
• 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