Sanderson
Javascript Developer
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Outside IR35 – 2x Senior Full Stack JavaScript Engineer
Day Rate
£600 (Outside IR35)
Duration
Greenfield programme, 3–6 months initial plus extensions
Location
Bristol / London – up to one day a week in the office, with remote flexibility depending on the team
A leading UK wealth management and investment platform is hiring two Senior Full Stack Engineers to join a team working on client-facing products that help retail investors manage and grow their wealth ahead of retirement. They're looking for engineers who take ownership, show initiative and can work autonomously once given direction.
The Role
- Deliver features, bug fixes and operational support across three repositories covering React frontends, AWS Lambda BFF layers and infrastructure as code
- Own issues end-to-end, from investigation through to production deployment
- Flag technical debt, bugs and improvement opportunities, and help improve CI/CD pipelines and deployment processes
- Write well-tested, maintainable code and contribute to code reviews and team engineering standards
- Work with the wider team, platform teams and product owners to deliver against requirements
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Required Skills & Experience
Backend / BFF
- Node.js with TypeScript
- AWS Lambda handler development with middleware patterns (e.g. Middy)
- API Gateway (routing, authorizers, request/response handling)
- RESTful API design
- OAuth/token-based authentication
- DynamoDB
- Secrets Manager
- SSM Parameter Store
AWS & Infrastructure
- AWS CDK or SST for infrastructure as code (including reading and modifying existing stacks)
- IAM
- SNS
- Basic VPC networking (Lambda in VPC, security groups)
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Testing
- Unit and integration testing with Vitest or similar
- API mocking with MSW or equivalent
- A test-first or test-aware mindset
CI/CD & Tooling
- CI/CD pipelines (GitLab CI or similar)
- Deploying to multiple environments and debugging deployment issues
- Monorepos
- Git in a team environment (branching strategies, merge requests, code reviews)
Desirable
Frontend
- React with TypeScript
- React Hook Form
- Zod/schema-based validation
- TanStack Query (React Query)
- Vite
- Playwright for end-to-end testing
- Accessibility awareness
Other
- SST v2
- Feature flagging (LaunchDarkly or similar)
- Cross-account AWS patterns (STS AssumeRole)
- Contract testing (Pact)
- Code quality tooling
- Financial services domain experience
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