Software Development Engineer III - Conversations

Our impact
Every month, HighLevel enables more than 1.5 billion messages, 200 million leads and 20 million conversations for the more than 1 million businesses we support. Behind those numbers are real people building independence, expanding opportunity and creating measurable impact. We’re proud to be a part of that.
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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
• 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
• 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

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