API Developer (Golang/Python) – Financial Services \* Inside IR35 \* Sheffield (1–2 days/month onsite) A leading financial services organisation is seeking an experienced API Developer to join their team on a contract basis. This is a great opportunity to work on modern, scalable systems within a highly regulated and fast-paced environment. This role would suit a developer who enjoys working on backend systems but is comfortable contributing to full-stack solutions when needed. If you’re looking to make an impact within a major financial organisation, this could be a strong fit. Role Overview You’ll be responsible for designing, building, and integrating high-performance APIs, with a strong focus on Golang (preferred) or Python. You’ll also collaborate with front-end teams, contributing to web-facing components using technologies such as React or Node.js. Key Responsibilities \* Design, develop, and maintain robust APIs \* Ensure seamless integration across internal and external systems \* Collaborate with cross-functional teams including front-end developers \* Contribute to architecture decisions and best practices \* Support performance optimisation and scalability initiatives Required Skills & Experience \* Strong experience with Golang (preferred) or Python \* Proven track record in API development (design, build, integration) \* Understanding of modern software engineering practices Nice to Have \* Experience with React or Node.js \* Working knowledge of Python (if not primary language) \* Exposure to Rust Highly Desirable \* Experience with Identity and Access Management (IAM) \* Familiarity with Google Cloud Platform (GCP) More details available on successful application