Software Development Engineer III - Core CRM

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 peopleWith 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 impactEvery 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 PostsAbout 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, its a system ownership role.Responsibilities:Backend System Ownership:Design and evolve Node.js / NestJS services powering systems that operate at scaleTake architectural decisions that balance scale, cost, and long-term maintainabilityAPI Craftsmanship:Build well-typed, thoughtful REST contracts for high volume flowsThink in versioning, backward compatibility, and clean boundariesData at Scale:Model and optimize MongoDB / Firestore schemas for high read/write workloadsDesign atomic updates and consistency strategies for distributed systemsScalability & Resilience:Implement queues, caching layers, and rate limiting to handle burst traffic gracefullyDesign for failure modes before they happenFrontend Integration:Ship modular Vue 3 UIs that efficiently consume APIsOptimize realtime updates and state management (Pinia)Improve Core Web Vitals and perceived performanceObservability & Production Ownership:Instrument logs, metrics, traces, and alertsParticipate in on-callDebug real production issuesDrive post-mortems to meaningful closure (not just documents)Mentorship & Leverage:Review code thoughtfullySupport junior engineersRaise engineering standards across the teamRequirements:4+ years of professional engineering experienceStrong backend-heavy fullstack backgroundDeep comfort with Node.js + TypeScriptExperience 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 limitingReal production debugging experienceComfortable in cloud-native environments (GCP / AWS)CI/CD and containerization familiarityNice to Have:Pub/Sub or message queue experienceEvent-driven systems exposureDomain-driven design familiarityPerformance optimization workExperience reducing infra costsEEO 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 your application and will not be used in the hiring decision. We encourage you to review our Privacy Policy before submitting your applicationOriginally posted on Himalayas