Senior Software Engineer - Transfers (Client Journeys)

External

Hargreaveslansdown · Bristol (harbourside)

Part-timeRemoteToday

AccessibilityAPI DesignAPI GatewayAWSCI/CDDynamoDB

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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.

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)

Senior Software Engineer - Transfers (Client Journeys)

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