Senior Software Engineer — Full Stack TypeScript

WHAT YOU WILL DO :

• Build and extend TypeScript microservices running on AWS Lambda
• Ship product features in React 19 + Vite applications across marketplace, booking, and practice management experiences
• Design and implement DynamoDB data models, SQS consumers, and EventBridge event handlers
• extract functionality from a legacy monolith into standalone services while maintaining backward compatibility
• Contribute to shared @karaconnect/* libraries used across the platform
• Write robust tests against real infrastructure rather than mocked services
• Define infrastructure with AWS CDK alongside the services you build
• Help shape engineering patterns, architecture decisions, and the long-term direction of the platform

WHAT IS ALREADY IN PLACE: 

• 15 shared TypeScript libraries forming a cohesive microservice framework

• Reference implementations that demonstrate the target architecture

• Standardized engineering patterns, including Zod schemas, Fastify inject() testing, centralized config, and reusable CI/CD workflows

• Infrastructure as code with AWS CDK
  

• AI-assisted development workflows using Claude Code, including specialist agents, planning, and automated verification

WHAT WE ARE LOOKING FOR: 

• Deep experience with TypeScript, including strict mode, generics, and type inference

• Comfort working full stack across backend services and React frontends

• Strong experience with AWS services such as Lambda, DynamoDB, SQS, EventBridge, and CDK

• Familiarity with Fastify, Express, or similar Node.js backend frameworks

• Solid understanding of event-driven architecture and idempotent message handling

• Experience decomposing, modernizing, or migrating legacy systems

• Strong testing instincts, especially integration-style testing against real services

• Ability to work independently in a small, high-autonomy team

NICE TO HAVE: 
- Experience with Keycloak or OpenID Connect
- Familiarity with Bun as a runtime and package manager
- Experience with Vitest, Biome, or other modern JavaScript tooling
- Healthcare, marketplace, or platform experience
- Comfort reading Python, since the legacy monolith is built in Flask and will be referenced during migration

ON STACK

TypeScript, Fastify 5, React 19, Vite, AWS Lambda, DynamoDB, SQS, EventBridge, CDK, Bun, Vitest, Biome, MySQL, Docker Compose, GitHub Actions

How We Work

• A submodule-based monorepo ecosystem spanning roughly 59 repositories
  
  

• AI-assisted development is built into the workflow
  
  

• Conventional commits, PR-based development, and automated versioning
  
  

• Small team, high ownership, high trust, and strong standards for code quality
  
  

Why This Role Is Interesting

This is a chance to join at a high-leverage moment. You’ll help shape both the platform and the engineering culture while working on meaningful product problems in healthcare. The role offers a lot of ownership, a modern TypeScript stack, and the opportunity to contribute across architecture, product, and infrastructure.

If you like building real systems, moving fast, and working with a team that cares deeply about clean architecture and quality, this role should feel like home.

Why Kara Connect?
Mission-Driven Work: The opportunity to work in an organisation dedicated to enabling everybody to access the help they need, when they need it.
Competitive Remuneration: Competitive salary and benefits package including participation in the company’s Share Option Plan
Wellbeing First: Access to professional coaches and therapists through our own Kara Connect Wellbeing Hub.
Hybrid Flexibility: Enjoy a blend of remote work and collaborative office time at our Skipholt office (typically 2–3 days a week in-office).