Lead Software Engineer – Calendar Platform

About HighLevel: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 PeopleWith 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 ImpactAs 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 Lead Engineer to join our Calendar Platform Builder Team, which is building the foundational infrastructure for the next generation of scheduling systems. This team is on a mission to enable businesses and developers to build flexible booking workflows across diverse industries — from salons and fitness centres to healthcare, education, sales, and rentals. We believe in Configuration over Code — empowering builders to define their scheduling logic, rules, workflows, and availability models without rewriting core logic. As a Lead Engineer, you’ll help architect and evolve this highly extensible platform. You’ll drive cross-cutting initiatives, mentor engineers, and build backend components that other teams, partners, and customers rely on to build sophisticated scheduling systems on top of our infrastructure.

Requirements:

• 6+ years of backend engineering experience, with at least 2 years in technical leadership roles
• Deep experience designing platforms, frameworks, or extensible APIs used by other developers
• Hands-on expertise in distributed systems, asynchronous processing, and scalable microservices
• Experience balancing developer flexibility with system guardrails — strong grasp of "configuration over code" and platform product thinking
• Strong system design, data modeling, and observability practices — especially in performance-sensitive, high-throughput environments
• Comfortable making architectural trade-offs and driving technical direction in ambiguous spaces

Responsibilities:

• Lead the design and development of core platform primitives — availability resolution, appointment lifecycles, time zone handling, and state-driven workflows
• Architect a system that prioritizes configuration-driven behavior over hardcoded logic, enabling dynamic rule-based booking flows
• Build scalable, composable services using NestJS, Redis, Firestore, MongoDB, PostgreSQL, and GCP services like Cloud Tasks, Scheduler, and Pub/Sub
• Partner with product managers to translate industry-agnostic scheduling needs into developer-facing building blocks
• Drive platform-wide consistency in API design, configuration modeling, error handling, and extensibility
• Collaborate across engineering teams to ensure platform reliability, observability (Grafana/Prometheus), and maintainability
• Mentor engineers and foster a strong culture of platform thinking, technical excellence, and high ownership

Bonus Points:

• Experience building or integrating with calendar APIs, scheduling tools, or booking platforms
• Familiarity with recurrence rules (RRULE), slot generation, conflict resolution, and multi-provider calendar sync
• Passion for enabling others — be it developers, partners, or other internal teams — to build great things on top of your systems

EEO Statement:At HighLevel, we value diversity. In fact, we understand it makes our organisation stronger. We are committed to inclusive hiring/promotion practices that evaluate skill sets, abilities, and qualifications without regard to any characteristic unrelated to performing the job at the highest level. Our objective is to foster an environment where really talented employees from all walks of life can be their true and whole selves, cherished and welcomed for their differences while providing excellent service to our clients and learning from one another along the way! Reasonable accommodations may be made to enable individuals with disabilities to perform essential functions. #NJ1

Originally posted on Himalayas

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