Software Development Engineer II - Conversations

About HighLevel:HighLevel is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. Today, HighLevel supports SMBs across 150+ countries, fueling community-driven growth rooted in real customer outcomes.
To date, businesses operating on HighLevel have generated over $7 billion in ecosystem value, demonstrating the impact of shared infrastructure at scale. By centralizing conversations, automation and intelligence into one system, we help businesses move faster, reduce complexity and execute efficiently.
Behind the platform, HighLevel powers more than 4 billion API hits and 2.5 billion message events daily. With 250 terabytes of distributed data, 250+ microservices and over 1 million domain names supported, our architecture is built for performance, resilience and long-term scalability.

Our people
With over 2,000 team members across 10+ countries, HighLevel operates as a global, remote-first organization built for speed and ownership. We value initiative, clarity and execution, creating space for ambitious people to build systems that support millions of businesses worldwide. Here, innovation thrives, ideas are celebrated and people come first, no matter where they call home.

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.
Learn more about us on our YouTube Channel or Blog Posts
 
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:: Build and ship features in Node.js / Go services that sit on real production paths — your code handles live traffic, not toy problems Own well-scoped services and components end to end: code, tests, rollout, and monitoring Work with SQL and NoSQL data stores — writing queries, adding indexes, and learning why the schema looks the way it does Get hands-on with queues, caches, and rate limiters — the building blocks of every system here Ship Vue 3 UIs that consume your own APIs — clean components, sane state management, and realtime updates that don't flicker or drift Write design docs for your features and defend them in review — clear thinking, honest trade-offs Join the on-call rotation with backup from senior engineers — incidents are where the deepest learning happens Ask questions relentlessly, absorb feedback from code reviews, and level up fast

Requirements:: 2+ years of backend engineering experience with strong fundamentals in Node.js, Go, or a comparable language — and the drive to go deep in ours Working knowledge of queues or async processing — you've used Pub/Sub, Kafka, RabbitMQ, or similar, and want to master delivery semantics, ordering, and backpressure Genuine interest in distributed systems — you understand the basics (idempotency, retries, consistency trade-offs) and are hungry to learn the rest