Senior Full Stack Engineer - Claude Code
£500-550 per day | Outside IR35 | Predominantly Remote
Contract: November 2026 – March 2027
Location: Remote-first | Occasional London attendance if required
We're working with a client on an exciting opportunity for an experienced Senior Full Stack Engineer to support the development and delivery of modern, scalable applications within a highly regulated enterprise environment.
This is a hands-on engineering role, suited to someone who enjoys writing production-quality code, building reliable backend services and contributing to frontend development where required.
You'll be joining an established engineering environment where AI-assisted development is actively encouraged, with Claude Code playing an important role in day-to-day delivery.
The Role
You'll work across the application stack, taking ownership of backend development while supporting frontend functionality, system integrations and ongoing improvements.
Key responsibilities include:
- Designing, building and maintaining backend services using Python and FastAPI.
- Developing scalable REST APIs, including asynchronous workflows, middleware and data validation.
- Working with PostgreSQL to manage database structures, optimise queries and implement schema changes.
- Supporting frontend development using React and TypeScript.
- Implementing secure authentication and access controls, including SSO, JWT and role-based permissions.
- Writing automated tests and maintaining high standards of code quality.
- Using Claude Code to accelerate development while reviewing and validating AI-generated code.
- Working within established GitHub workflows, CI pipelines and enterprise engineering standards.
- Collaborating with technical stakeholders to deliver secure, maintainable solutions.
What We're Looking For
Essential experience:
- Strong commercial Python development experience.
- Hands-on expertise with FastAPI, Pydantic and PostgreSQL.
- Experience with Alembic or equivalent database migration tooling.
- Working knowledge of React and TypeScript.
- Experience implementing authentication, authorisation and secure API integrations.
- Automated testing using pytest and JavaScript testing frameworks.
- Strong understanding of Git, GitHub, pull requests and CI processes.
- Practical experience using Claude Code within commercial software development.
- Ability to critically review, test and improve AI-generated code.
- Experience delivering software within regulated or process-driven enterprise environments.
- Strong understanding of secure coding practices and change management processes.
Desirable Experience
- Azure services, including App Service, Key Vault and Application Insights.
- PingFederate or equivalent enterprise SSO solutions.
- Rules engines, workflow automation or configurable business logic.
- Data integrity, concurrency management and audit logging.
- Advanced Claude Code capabilities, including custom skills, subagents and parallel development workflows.
- Experience using GitHub Copilot for code review.
- Accessibility standards and enterprise design systems.
Why Consider This Opportunity?
This is an opportunity to contribute to a technically interesting project where modern software engineering and AI-assisted development come together.