Senior Software Engineer - Transfers (Client Journeys)

Hargreaves Lansdown; West of England; On-site; GBP 65,000 - 85,000; Full time

Job summary

Hargreaves Lansdown is seeking a Senior Full-Stack Engineer to develop and maintain transfer applications. The role requires expertise in Node.js, AWS, and React, and involves driving technical strategy and mentoring junior engineers.

The ideal candidate will possess strong communication skills and experience with CI/CD practices, contributing to the continuous improvement of applications and aligning with company-wide engineering standards.

Qualifications

• Proven experience with Node.js, AWS, and React.
• Strong technical skills in building scalable applications.
• Experience with CI/CD practices and infrastructure as code.

Responsibilities

• Develop and maintain transfer applications across products.
• Drive technical strategy and propose improvements.
• Mentor junior engineers and uphold engineering standards.

Skills

Node.js (v20+) with TypeScript

AWS Lambda handler development

RESTful API design

React (v18+) with TypeScript

Tools

AWS CDK/SST

Vitest

GitLab CI

Job description

We're looking for a Senior Full-Stack Engineer to develop and maintain our suite of transfer applications. You'll work across various repositories spanning React frontends and AWS serverless backends, owning the full delivery lifecycle from feature development through to production.

Critically, we want someone who can help drive the technical strategy and continuous improvement of these applications, aligning with broader company engineering standards and platform direction.

Key Responsibilities

• Develop and maintain multi-step transfer journeys across transfer products
• Own the full stack; React frontends, AWS Lambda BFF layers, and IaC
• Drive technical strategy for the transfers domain, proposing and delivering improvements that align with company-wide engineering direction
• Champion continuous improvement; identify tech debt, propose modernisation, and improve developer experience
• Contribute to architectural decisions around API design, infrastructure patterns, and cross-service integration
• Collaborate with platform/infrastructure teams to evolve integration patterns
• Support CI/CD pipelines and deployment processes across all environments (dev, staging, production)
• Mentor other engineers and contribute to team-wide engineering standards

Required Skills & Experience

• Node.js (v20+) with TypeScript
• AWS Lambda handler development (both SST and raw CDK patterns)
• Middy middleware framework
• Integration patterns: cross-account STS AssumeRole, Secrets Manager, DynamoDB, SNS
• RESTful API design and OpenAPI specifications

AWS & Infrastructure

• AWS CDK and/or SST for infrastructure as code
• Core services: Lambda, API Gateway, DynamoDB, VPC, IAM, KMS, Secrets Manager, SSM Parameter Store, SNS
• VPC networking - Lambda in VPC, security groups, egress configuration
• Lambda provisioned concurrency and auto-scaling
• Understanding of WAF and ingress routing patterns

Testing

• Vitest for unit and integration testing
• MSW (Mock Service Worker) for API mocking
• Testcontainers experience is a plus

CI/CD & DevOps

• GitLab CI pipelines; multi-stage, environment-specific deployments
• Automated security scanning (Snyk or similar SAST/DAST)

General

• Monorepo experience (pnpm workspaces, npm workspaces)
• Feature flagging (LaunchDarkly or similar)
• OAuth/token-based authentication and authorisation flows
• Strong understanding of cross-account AWS patterns

Frontend

• React (v18+) with TypeScript
• TanStack Query (React Query) for server state management
• Vite build tooling
• Component library integration
• Playwright for end-to-end and snapshot testing
• Contract testing (Pact)
• Analytics integration (Adobe Analytics or similar)

Other

• Experience with SST v2 (Serverless Stack) specifically
• Familiarity with API gateway/ingress platforms
• Experience with Cognito for machine-to-machine auth
• Experience driving technical roadmaps and aligning them with broader organisational strategy

What We're Looking For Beyond Technical Skills

• Someone who proactively identifies opportunities for improvement rather than waiting to be told
• Ability to articulate technical trade-offs and influence direction at a team and cross-team level
• A pragmatic approach, balancing ideal solutions with delivery timelines
• Comfort working across codebases with different maturity levels and patterns (SST monorepo vs CDK + separate frontend)
• Strong communication skills for collaborating with platform teams, product owners, and other squads