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API Developer (Golang/Python) – Financial Services Inside IR35Sheffield (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 Back End 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 APIsEnsure seamless integration across internal and external systemsCollaborate with cross-functional teams including Front End developersContribute to architecture decisions and best practicesSupport performance optimisation and scalability initiatives Required Skills & Experience Strong experience with Golang (preferred) or PythonProven track record in API development (design, build, integration)Understanding of modern software engineering practices Nice to Have Experience with React or Node.jsWorking 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.