We know that sometimes people can be put off applying for a job if they don't tick every box. 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. We’d love to hear from you!
About the role
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
Backend / BFF
- Node.js (v20+) with TypeScript
- AWS Lambda handler development (both SST and raw CDK patterns)
- API Gateway (REST/V1) — authorizers, routing, gateway responses
- 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)
- Environment promotion strategies (dev → staging → production)
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
Desirable
Frontend
- React (v18+) with TypeScript
- React Hook Form, Zod/schema-based validation
- TanStack Query (React Query) for server state management
- Vite build tooling
- Component library integration
- Accessibility-first development
- 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
- Financial services domain experience
- 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
Why us?
Here at HL, we’re the UK’s number 1 investment platform for private investors, based in Bristol. For more than 40 years we’ve helped investors save time, tax and money on their investments.
To achieve our mission, we believe we have a workplace like no other, with constant learning, dynamic teams, and a great ethos. We're steered by core values that promote service, quality, innovation, and opportunity in everything we do.
What's on offer?
- Discretionary annual bonus* and annual pay review
- 25 days* holiday plus bank holidays and 1-day additional Christmas closure
- Option to purchase an additional 5 days holiday**
- Flexible working options available, including hybrid working
- Enhanced parental leave
- Pension scheme up to 11% employer contribution
- Income Protection and Life insurance (4 x salary core level of cover)
- Private medical insurance*
- Health care cash plans - including optical, dental, and outpatient care
- Health screening programme
- Help@hand - confidential support including mental health counselling and remote GP
- Wellhub - unlimited access to fitness providers and wellness coach sessions
- Variety of travel to work schemes with bike storage and shower facilities
- Inhouse barista and deli serving subsidised coffee and sandwiches
- Two paid volunteering days per year
* dependant on role level
** only available to select during our annual benefits window, in November each year
Hargreaves Lansdown is an inclusive employer that values diversity in its workforce. We encourage applications from all individuals without regard to race, religion, gender, sexual orientation, national origin, disability or age.
This role may also be available on a flexible working or part time basis – please ask the Recruitment & Onboarding team for more information.
Please note, we are unable to provide employment sponsorship to candidates.
Skills Required
- Node.js (v20+) with TypeScript
- AWS Lambda handler development (SST and raw CDK patterns)
- API Gateway (REST/V1) including authorizers and routing
- Middy middleware framework
- Cross-account STS AssumeRole integration patterns
- AWS Secrets Manager
- DynamoDB
- SNS
- RESTful API design and OpenAPI specifications
- AWS CDK and/or SST for infrastructure as code
- Core AWS services: Lambda, API Gateway, DynamoDB, VPC, IAM, KMS, SSM Parameter Store, SNS
- VPC networking knowledge (Lambda in VPC, security groups, egress)
- Lambda provisioned concurrency and auto-scaling
- Understanding of WAF and ingress routing patterns
- Vitest for unit and integration testing
- MSW (Mock Service Worker) for API mocking
- GitLab CI pipelines and multi-stage environment deployments
- Automated security scanning (Snyk or similar)
- 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
- React (frontends)
- Testcontainers experience
- Playwright for end-to-end testing
- Contract testing (Pact)
- SST v2 (Serverless Stack) specific experience
- Cognito for machine-to-machine auth
- Financial services domain experience
- Experience driving technical roadmaps and cross-organisational alignment
What We Do
We’re the UK’s number 1 investment platform for private investors, based in Bristol, where we now employ over 1,700 people. For more than 40 years we’ve helped investors save time, tax and money on their investments. Today we're trusted by over 1.7 million clients. Our service allows clients to bring all their ISAs, pensions, SIPPS, and savings into one easy to manage place, allowing them to be in control.
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