Staff Engineer - LC Phone

About Us
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 15 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 domain names.

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.

About the Role
We’re looking for a Staff Software Engineer to join our LC Phone Team, which powers the core communication platform handling SMS, MMS, Voice Calls, Whatsapp and RCS messaging across our product ecosystem. This team is responsible for delivering a reliable, secure, and performant infrastructure that handles millions of time-critical operations — from Purchasing Phone numbers, Delivering SMS, Connecting Voice calls, Conferences, Automated Billing systems through multiple service providers.
Millions of SMBs on our platform utilise these services to communicate with their customers, provide services and updates. Currently the system handles 100M+ events on a daily basis spanning across 15+ different services. LC Phone is a major contributor to Highlevel’s revenue where services uptime, reliability are paramount, making sure customers are having the best experience possible on the platform.
As a Staff Engineer, you’ll lead the technical direction of the platform, solve complex distributed system problems, and mentor 10+ engineers across squads of 5 different products. You’ll partner closely with PMs, designers, infra, and security teams to drive long-term architecture, elevate engineering standards, and ensure seamless user experiences at scale.

Responsibilities
- Own architecture and scaling decisions for key Phone platform components (e.g., Phone numbers, Compliance, Messaging APIs)
- Lead design and execution of cross-cutting initiatives to improve reliability, latency, and throughput across time-sensitive APIs and workflows
- Work hands-on with technologies like NestJS, Firestore, MongoDB, PostgreSQL, Redis, Queuing Systems, Data Warehousing Systems and Service Mesh-based microservices
- Drive observability and resilience by evolving our monitoring, alerting (Prometheus/Grafana), and incident response strategies
- Leverage LLMs and AI tools to write, refactor, test, and debug code efficiently — while implementing guardrails to reduce hallucination and boost reliability.
- Partner with product, infra, and security teams to ensure data integrity, access control, and compliance across phone servicesMentor and guide a team of high-performing engineers, encouraging technical excellence and career growth
- Stay on the bleeding edge of AI/LLM technology, development best practices, and distributed architecture patterns — and bring that knowledge back to the team.
- Participate in design reviews, deep dives, and on-call rotations to support a high-bar culture of accountability and operational excellence

Requirements:
- 8+ years of backend engineering experience, including designing fault-tolerant systems and working on high-scale platforms.
- Deep expertise in distributed systems, event-driven architectures, and asynchronous job processing
- Proven experience optimizing availability, performance, and reliability in real-world systems under load
- Strong experience with relational and NoSQL data models (especially with complex transactional data)
- Deep knowledge of Frontend Systems with any frameworks (Angular, VueJS, React) and familiarity with Design Principles and User Experience
- Familiarity with monitoring, SLOs, and root-cause analysis in production environments
- Familiarity with hallucination mitigation strategies (e.g., code constraints, test scaffolding, embeddings, context injection).
- Excellent communication and cross-functional collaboration skills
- A pragmatic, hands-on leader who balances long-term vision with iterative execution

EEO Statement
The company is an Equal Opportunity Employer.
As a part of affirmative action compliance, demographic information may be collected voluntarily.
This information is used strictly for legal compliance, will be kept separate from your application, and will not impact hiring decisions.