Javascript Developer

Node.js Contractor – AI Tool Replatforming Remote | Outside IR35 | £450–500/day We are looking for an experienced Node.js contractor to help replatform and modernise an internally developed AI-driven data platform. The existing tool was rapidly developed by a member of the technical team using AI-assisted development tools and is currently running locally on a laptop environment. We now need an experienced engineer to rewrite/refactor the application into a secure, production-ready Node.js solution suitable for deployment within our server infrastructure. The Role You will take ownership of analysing the current Python-based application and rebuilding/refactoring it into a scalable and maintainable Node.js platform. The application: • Pulls data from multiple external sources including: • RSS feeds • Websites • APIs • Processes and stores data within a database • Includes a front-end interface for displaying and interacting with the data A key part of the engagement will be ensuring the rebuilt platform is secure, robust, and capable of passing penetration/security testing. Required Skills & Experience • Strong commercial experience with Node.js • Experience refactoring or rewriting existing applications • Solid understanding of secure software engineering practices • Experience building applications that integrate with APIs, web scraping, and data feeds • Database design and integration experience • Front-end development capability (React/Vue/modern JS frameworks beneficial) • Experience deploying applications into production server environments • Understanding of authentication, security hardening, and application resilience • Ability to work independently and make pragmatic architectural decisions Desirable • Previous experience working with AI/LLM-powered applications • Python experience to help interpret the existing codebase • Experience preparing systems for penetration testing/compliance review • DevOps/cloud infrastructure experience Contract Details • Contract: Outside IR35 • Rate: £450–500 per day • Location: Fully remote • Start: ASAP • Duration: Initially 10-12 weeks but potential for extension We’re looking for someone pragmatic, technically strong, and comfortable taking an early-stage internal tool and turning it into a secure, production-grade platform.