The Role
We are working with an AI fintech start-up which is looking for an experienced Senior Full-Stack Developer to support the continued development of its core platform and a growing suite of new products. This is a hands-on, full-stack contract role with a high level of autonomy, contributing to feature delivery, architectural decisions, and engineering best practices.
The role would suit someone comfortable working in a distributed team, able to communicate clearly with both technical and non-technical stakeholders, and happy taking ownership of their work end to end.
Key Responsibilities
* Build and deliver new features across frontend and backend systems
* Write clean, maintainable code using modern JavaScript and cloud-native patterns
* Design and work with PostgreSQL databases and scalable APIs
* Work closely with product, compliance, and engineering teams to solve real-world problems
* Contribute to architectural decisions and improvements as the platform scales
* Support code quality through testing, CI/CD, and peer review
Key Skills & Experience
* Strong experience with React and Next.js
* Backend development experience with Node.js and API-driven architectures
* Experience working with PostgreSQL and ORMs (ideally Sequelize)
* Hands-on experience integrating AI or ML-powered tools (e.g. OpenAI APIs or similar services)
* Solid AWS knowledge, particularly Lambda, Cognito, RDS, and S3
* Experience with CI/CD pipelines using GitHub Actions and automated testing tools
* A strong communicator, comfortable collaborating with both technical and non-technical stakeholders
Contract Details
* 12-month contract
* Outside IR35
* Fully remote
* London office available if candidates wish to attend occasionally
• • £450–£500 per day