Senior Full Stack Engineer

£550 GBP

Hybrid WORKING

Location: Holborn, Central London, Greater London - United Kingdom Type: Contract

We're looking for an experienced Senior Full Stack Engineer to join a high-profile programme within a heavily regulated organisation. This is a hands-on development role where you'll be building and enhancing modern applications while working within established engineering standards and delivery processes.

Rate: Outside IR35

Remote: Holborn

What You'll Need

• Strong commercial experience with Python development.
• Excellent knowledge of FastAPI, including API design, middleware and asynchronous programming.
• Experience using Pydantic for data validation and API modelling.
• Experience with Alembic (or similar schema migration tools).
• Strong PostgreSQL skills, including data modelling, query optimisation and database migrations.
• Experience with React and TypeScript to support front-end feature development.
• Good understanding of authentication and authorisation, including SSO, JWT and role-based access control (RBAC).
• Experience writing automated tests using pytest and JavaScript testing frameworks.
• Strong knowledge of Git and GitHub, including branching strategies, pull requests, code reviews and CI pipelines.
• Hands-on experience using Claude Code (or a similar AI coding assistant) as part of your day-to-day development workflow.
• Ability to critically review AI-generated code before submitting pull requests.
• Strong secure coding practices, including secrets management and resolving security vulnerabilities.
• Experience collaborating asynchronously within established engineering standards and code review processes.

Desirable Experience

• PingFederate.
• Rules or workflow engine development.
• Concurrency, locking, idempotency and audit logging.
• Microsoft Azure, particularly App Service, Key Vault, Managed Identity and Application Insights.
• Advanced use of Claude Code, including custom skills, sub-agents and agent configuration.
• Experience using GitHub Copilot for code reviews.
• Knowledge of WCAG 2.1 AA accessibility standards and enterprise design systems.
• Experience with Vite and the npm ecosystem.
• Previous experience delivering software within regulated enterprise environments such as pharmaceuticals, healthcare or financial services.