Javascript Developer

Sanderson; Greater London; Hybrid; GBP 75,000 - 110,000; Full time

Job summary

Sanderson in the United Kingdom is hiring two Senior Full Stack Engineers to join a team building client-facing wealth management products. You will own features across three repositories covering React frontends, AWS Lambda BFF layers and infrastructure as code, delivering end-to-end across the stack.

You will work with product owners to meet requirements, write well-tested code, participate in code reviews, and help improve CI/CD pipelines and deployment processes.

Qualifications

• Strong backend and frontend experience with Node.js/TypeScript and React.
• Experience building serverless architectures on AWS (Lambda, DynamoDB, Secrets Manager, SSM).
• Experience with CI/CD pipelines, monorepos and Git in a team setting.

Responsibilities

• Deliver features and fixes across React frontends, AWS Lambda BFF layers and IaC.
• Own issues end-to-end from investigation to production deployment.
• Improve CI/CD pipelines and deployment processes.
• Write well-tested, maintainable code and participate in code reviews.

Skills

Node.js

TypeScript

REST APIs

OAuth

Code ownership

Team collaboration

React

Code reviews

Tools

AWS Lambda

AWS CDK

SST

Vitest

MSW

GitLab CI

Vite

Playwright

LaunchDarkly

Pact

Job description

• 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

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)
• 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)
• 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