Software Development Engineer II - Backend

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 d 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 .
About the Role
We’re building a global commerce platform to power $1T+ in annual transactions for millions of SMEs. As an SDE III, you’ll design core models—subscriptions, payments, reconciliation, and tax—plus the services around them. You’ll define event contracts, data policies, and consistency guarantees to ensure every transaction is correct by design, traceable, and delightful at scale.
Responsibilities
- Design and ship multi-tenant services: checkout, subscriptions, payments orchestration, invoicing, tax hooks
- Integrate PSPs and local methods (UPI, wallets, BNPL, cards/3DS) with resilient webhooks and idempotent APIs / Implement an append-only double-entry ledger; event sourcing/CQRS where it improves scale and correctness
- Write production-grade code with deep test coverage and OpenTelemetry instrumentation
- Operate on GKE with CI/CD, autoscaling, SLIs/SLOs, and on-call ownership
- Collaborate with PM/Design and mentor junior engineers

Requirements
- 2+ years in software development
- Experience with MongoDB/Firestore, Redis, and event-driven systems (Kafka, Pub/Sub)
- Strong distributed systems fundamentals: idempotency, retries, ordering, concurrency, and consistency
- Hands-on experience with Kubernetes and GCP; familiarity with secrets/KMS and PCI basics
- Deep testing discipline: unit, integration, contract, and performance testing
- Schema design for scale and backward compatibility
- Excellent debugging and problem-solving skills
- Ability to build responsive, accessible, and performant UIs that integrate cleanly with backend APIs
- Familiarity with component-driven design, state management, and modern frontend tooling (Vite, ESLint, etc.)

Tech Stack
- Backend: Go, ConnectRPC, Buf
- Frontend: Vue.js, Vite, Webpack MFA, TanStack Query
- Databases: MongoDB, Firestore, Clickhouse
- Cloud: GCP (GKE), Pub/Sub, Redis, OpenTelemetry

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 recordkeeping, 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 you