HighLevel
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, and 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 daily, spanning across 15+ different services. LC Phone is a major contributor to HighLevel's revenue, where service uptime and reliability are paramount, making sure customers have 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 services. Mentor 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
10 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 optimising 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.
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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 services. Mentor 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
10 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 optimising 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.
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