Software Engineer, Backend Developer

We're hiring a Senior Full Stack Engineer to design, build, and scale the backend systems and frontend interfaces that power the Threads & Composer experience inside High Level Conversations. You'll spend most of your time on backend and API design, data flows, and performance while still owning the Vue 3 UI layer end-to-end. Your work will touch critical paths that process billions of messages per month, demanding reliability, throughput, and correctness at scale.

The Conversations organisation powers multi-channel communication across SMS, Email, Whats App, and DMs, handling over 2B messages each month. The Threads and Composer team owns the inbox and composer surfaces, and the backend services that deliver and store those interactions. You'll work across Node.js microservices, GCP-based infra (GKE, Pub/Sub, Cloud Tasks), and Mongo

DB/Firestore storage layers, ensuring every message and UI state stays consistent, fast, and recoverable.

• Backend ownership:
  Design and maintain Node.js/NestJS services for message storage, retrieval, and state sync.
• API design:
  Build well-typed REST contracts for Threads and Composer operations.
• Data layer work:
  Model and optimise Mongo
  
  DB/Firestore schemas for high read/write volumes and atomic updates.
• Scalability and resilience:
  Implement queues, caching, and rate limiting to handle burst traffic gracefully.
• Frontend integration:
  Ship modular Vue 3 UIs that consume your APIs efficiently and handle real-time state updates.
• Observability:
  Instrument logs, metrics, and traces to monitor latency, error rates, and throughput.
• Testing discipline:
  Maintain high coverage across unit, integration, and contract tests.
• Production ownership:
  Participate in on-call, debug incidents, and drive post-mortem action items to closure.
• Collaboration and mentorship:
  Work closely with Product and Frontend leads while reviewing code and supporting junior engineers.

• 4+ years of professional engineering experience, preferably backend-heavy full-stack work.
• Expert in Node.js and Type Script; comfortable with NestJS or Express microservices.
• Proficient in Vue 3 or similar modern frontend frameworks.
• Strong understanding of API design, data modelling, and distributed system patterns.
• Experience with GCP (or AWS), containerization, and CI/CD automation.
• Hands-on with observability and production monitoring.
• Bonus:
  Pub/Sub or message queue experience; event-driven or domain-driven design background.

• Backend:
  Node.js, Type Script, NestJS / Express, REST APIs.
• Frontend:
  Vue 3, Type Script, Pinia, Vite / Webpack, Tailwind.
• Storage:
  Mongo
  
  DB, Firestore, Redis.
• Infra: GCP (GKE, Pub/Sub, Cloud Tasks, Stackdriver).
• CI/CD:
  Git Hub Actions, Docker, Kubernetes.
• Testing:
  Jest, Vitest.