Senior Full-Stack Engineer

Who you are

• If you're excited about working for us and have most of the skills or experience we're looking for, please go ahead and apply
• Node.js with TypeScript
• AWS Lambda handler development
• API Gateway - routing, authorizers, request/response handling
• Middleware patterns for Lambda handlers (e.g. Middy)
• Working with DynamoDB, Secrets Manager, and SSM Parameter Store Confidential
• RESTful API design
• AWS CDK or SST for infrastructure as code
• Familiarity with core AWS services: Lambda, API Gateway, DynamoDB, IAM, VPC, SNS
• Basic understanding of VPC networking - Lambda in VPC, security groups
• Comfortable reading and modifying existing IaC stacks
• Unit and integration testing with Vitest or similar
• API mocking with MSW or equivalent
• A test-first or test-aware mindset
• Experience with CI/CD pipelines (GitLab CI or similar)
• Comfortable deploying to multiple environments and debugging deployment issues
• Working in monorepo setups
• OAuth/token-based authentication flows
• Comfortable using Git in a team environment (branching strategies, merge requests, code reviews)
• React with TypeScript
• React Hook Form, Zod/schema-based validation
• TanStack Query (React Query)
• Vite build tooling
• Playwright for end-to-end testing
• Accessibility awareness
• Experience with SST v2 (Serverless Stack)
• Feature flagging (LaunchDarkly or similar)
• Cross-account AWS patterns (STS AssumeRole)
• Contract testing (Pact)
• Financial services domain experience
• Code quality tooling

What the job involves

• We’re building the next generation platform for one of the UK’s largest financial services companies, trusted by over 2 million clients and managing c.£150 billion in assets
• You will contribute in expanding our new capabilities that will enable our clients to seamlessly transfer in (and out) financial products like SIPPs and ISAs
• We're looking for a Full-Stack Engineer to develop and maintain our suite of transfer applications
• You'll work across three repositories spanning React frontends and AWS serverless backends, contributing to feature delivery, bug fixes, and operational support across the full stack
• We want someone who takes ownership of their work, shows initiative in solving problems, and can operate with autonomy once given direction
• Build and maintain features across transfer journeys
• Work across the full stack - React frontends, AWS Lambda BFF layers, and infrastructure as code
• Take ownership of issues end-to-end, from investigation through to production deployment
• Proactively identify and raise technical debt, bugs, and improvement opportunities
• Support and improve CI/CD pipelines and deployment processes
• Write well-tested, maintainable code with good coverage
• Collaborate with the wider team, platform teams, and product owners to deliver against requirements
• Participate in code reviews and contribute to team engineering standards
• What Success Looks Like
• Someone who takes ownership — when they pick up an issue, they see it through to completion
• Initiative to investigate and resolve problems without needing to be hand-held
• Comfortable asking questions and raising blockers early rather than getting stuck silently
• Willingness to work across unfamiliar parts of the codebase and learn on the job
• Good communication skills — able to explain what they're working on and flag risks to the team
• A growth mindset — keen to develop their skills across backend, infrastructure, and frontend

The application process

• End Date: September 30, 2026

Benefits

• Generous Discretionary Annual Bonus
• Up to 19% Pension
• Private Medical Insurance*
• Health Cash Plan
• Income Protection
• Life Assurance (4x Salary)
• Additional Holiday Purchase