Software Development Engineer III - Conversations

About HighLevel:
HighLevel is an AI powered, all-in-one white-label sales & marketing platform that empowers agencies, entrepreneurs, and businesses to elevate their digital presence and drive growth. We are proud to support a global and growing community of over 2 million businesses, comprised of agencies, consultants, and businesses of all sizes and industries. HighLevel empowers users with all the tools needed to capture, nurture, and close new leads into repeat customers. As of mid 2025, HighLevel processes over 4 billion API hits and handles more than 2.5 billion message events every day. Our platform manages over 470 terabytes of data distributed across five databases, operates with a network of over 250 microservices, and supports over 1 million hostnames.

Our People
With over 1,500 team members across 15+ countries, we operate in a global, remote-first environment. We are building more than software; we are building a global community rooted in creativity, collaboration, and impact. We take pride in cultivating a culture where innovation thrives, ideas are celebrated, and people come first, no matter where they call home.

Our Impact
As of mid 2025, our platform powers over 1.5 billion messages, helps generate over 200 million leads, and facilitates over 20 million conversations for the more than 2 million businesses we serve each month. Behind those numbers are real people growing their companies, connecting with customers, and making their mark - and we get to help make that happen.

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

EEO Statement:
The company is an Equal Opportunity Employer. As an employer subject to affirmative action regulations, we invite you to voluntarily provide the following demographic information. This information is used solely for compliance with government record-keeping, reporting, and other legal requirements. Providing this information is voluntary and refusal to do so will not affect your application status. This data will be kept separate from your application and will not be used in the hiring decision.

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