Role Summary
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 HighLevel 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.
Team & System Overview
The Conversations organization powers multi-channel communication across SMS, Email, WhatsApp, and DMs — handling over 2B messages each month. The Threads & 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 MongoDB/Firestore storage layers, ensuring every message and UI state stays consistent, fast, and recoverable.
Responsibilities
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 optimize MongoDB/Firestore schemas for high read/write volumes and atomic updates
Scalability & 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 realtime 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 & mentorship: Work closely with Product and Frontend leads while reviewing code and supporting junior engineers
- Requirements:
- 4+ years of professional engineering experience, preferably backend-heavy full-stack work
Expert in Node.js and TypeScript; comfortable with NestJS or Express microservices
Proficient in Vue 3 or similar modern frontend frameworks
Strong understanding of API design, data modeling, 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
- Technical Environment:
- Backend: Node.js, TypeScript, NestJS / Express, REST APIs
Frontend: Vue 3, TypeScript, Pinia, Vite / Webpack, Tailwind
Storage: MongoDB, Firestore, Redis
Infra: GCP (GKE, Pub/Sub, Cloud Tasks, Stackdriver)
CI/CD: GitHub Actions, Docker, Kubernetes
Testing: Jest, Vitest
