JavaScript/TypeScript API Engineer Contract Length: 6 Months Location: Manchester (1 Day a week in Manchester City Centre Office) Rate: Outside IR35 £350 - £400 per day *Immediate Start* Join a fast-moving product consultancy delivering high-impact software for a broad mix of clients across a range of sectors. They're now looking for an experienced contractor to support a critical project focused on API development and complex system integration. The Role: You'll be part of a small, highly cooperative engineering team working on a SaaS platform designed to streamline and automate operational workflows. The focus is on building out and refining backend APIs, integrating third-party services, and improving the overall scalability and reliability of the system. Tech Stack: TypeScript & JavaScript Node.js with Express n8n (workflow and automation integrations) PostgreSQL Permit.io (RBAC and auth) API best practices (rate limiting, downstream HTTP integrations) GraphQL (mostly migrating from) Day-to-Day Responsibilities: Contribute to backend development and API design using TypeScript Work on system integrations using n8n and other tools Collaborate on migrating from GraphQL toward more traditional RESTful architecture Implement robust authentication and access control flows with Permit.io Help shape and scale API architecture with performance in mind Tackle complex business logic in a regulatory or data-driven context About You: Strong experience in backend JavaScript/TypeScript development Comfortable in a busy, agile environment Confident working autonomously in small, senior teams Bonus if you've worked in fintech, regtech, or SaaS products Clear understanding of scalable API architecture, auth, and third-party integrations Please Apply with your CV if this contract is the best fit for you!