Software Development Engineer III - Custom Objects (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 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

About the Role
We are building systems that operate at scale - high write volumes, real-time state sync, and burst traffic that doesn’t politely warn before it arrives.We are looking for engineers who love owning systems end-to-end, care deeply about performance and reliability, and want to build things that don’t just work - but last.This is not a ticket-execution role. This is a system ownership role.
 

Responsibilities:

Backend System Ownership

Design and evolve Node.js / NestJS services powering systems that operate at scale

Take architectural decisions that balance scale, cost, and long-term maintainability

API Craftsmanship

Build well-typed, thoughtful REST contracts for high volume flows

Think in versioning, backward compatibility, and clean boundaries

Data at Scale

Model and optimize MongoDB / Firestore schemas for high read/write workloads

Design atomic updates and consistency strategies for distributed systems

Scalability & Resilience

Implement queues, caching layers, and rate limiting to handle burst traffic gracefully

Design for failure modes before they happen

Frontend Integration

Ship modular Vue 3 UIs that efficiently consume APIs

Optimize realtime updates and state management (Pinia)

Improve Core Web Vitals and perceived performance

Observability & Production Ownership

Instrument logs, metrics, traces, and alerts

Participate in on-call

Debug real production issues

Drive post-mortems to meaningful closure (not just documents)

Mentorship & Leverage

Review code thoughtfully

Support junior engineers

Raise engineering standards across the team

Requirements:

4+ years of professional engineering experience

Strong backend-heavy fullstack background

Deep comfort with Node.js + TypeScript

Experience building and scaling microservices (NestJS / Express)

Modern frontend experience (Vue 3 or similar)

Strong understanding of:

API design

Data modeling

Distributed systems tradeoffs

Concurrency & rate limiting

Real production debugging experience

Comfortable in cloud-native environments (GCP / AWS)
CI/CD and containerization familiarity

Bonus Points:

Pub/Sub or message queue experience

Event-driven systems exposure

Domain-driven design familiarity

Performance optimization work

Experience reducing infra costs

Our Tech Environment:

Backend: Node.js, TypeScript, Ne…