Software Development Engineer III – Calendars

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 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 hiring an experienced SDE3 for our Core team, which powers vertical-specific scheduling features across use cases like meetings, services, and rentals. As an SDE3, you’ll work on backend-heavy full stack features that bring real-world booking experiences to life — such as workflows, payments, lead generation, form submissions, notifications, and search. You’ll collaborate with platform, booking engine, and integrations teams to ensure that our solutions are scalable, intuitive, and flexible across industries. This role is ideal for someone who thrives in product-oriented backend systems, has a strong full stack foundation, and is comfortable using AI tools to enhance their development speed and effectiveness. Requirements: 4+ years of experience in software engineering with a strong focus on backend systems and API design Deep expertise in Node.js/NestJS, TypeScript, and distributed system fundamentals Experience working with both SQL and NoSQL databases at scale Ability to work end-to-end across the stack — especially owning backend complexity and integrating with UI components Solid understanding of async workflows, queues, background jobs, webhooks, and system state transitions Familiarity with GCP services or willingness to get hands-on with them Openness to using AI tools (e.g., Cursor, Github Copilot, Claude Code) to accelerate development and improve code quality Strong debugging and system design skills; ability to make pragmatic architectural decisions Responsibilities: Design and build backend-heavy scheduling features that power industry use cases like meetings, rentals, and services Build scalable APIs and business logic using Node.js/NestJS, with Firestore, PostgreSQL, Elasticsearch, and Redis as data layers Leverage GCP tools like Cloud Tasks, Cloud Scheduler, Pub/Sub, and Cloud Functions to build reliable, event-driven infrastructure Contribute to the full development lifecycle — from designing APIs and modeling data to testing, deploying, and maintaining systems Integrate seamlessly with App and Integrations teams to ensure cohesive cross-squad delivery. Work on features like form submissions, appointment workflows, notifications, payments, notes/tasks, and intelligent search capabilities Build modular systems that adapt to diverse customer workflows, while maintaining strong performance and reliability Bonus Points: Experience with appointment systems, lead funnels, workflow engines, or search infrastructure Background in building domain-specific features for industries like healthcare, education, fitness, or local services Experience working with time-based systems, recurrence logic, or custom state machines 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