Full Stack Engineer III

Ready to make a serious impact? Millions of people already rely on Calendly, and we’re still in the midst of exciting product growth — it’s a fantastic time to join us. Everything you’ll work on here will accelerate your career to the next level. If you want to learn, grow, and do the best work of your life alongside the best people you’ve ever worked with, then we hope you’ll consider allowing Calendly to be a part of your professional journey.

What’s so great about working on Calendly’s Engineering team? 

We make things possible for our customers through innovation.

Why do we need you? Well, we are looking for a Full Stack Engineer who will bring technical know-how and enthusiasm to our team. You will report to one of our Engineering Managers and will be responsible for supporting features and architecture designed to maintain our users’ confidence in Calendly. 

The Calendly platform is a monolith that is being decomposed into various services in order for us to scale our platform and team. We need ambitious, experienced engineers who can help us drive this stage of growth. As an engineer at Calendly, you will both build new features and work to scale our platform and architecture. You will build tooling and automation to fine tune our delivery process as you grow into a service oriented specialist. You will also learn to work with multiple technologies such as Google Cloud Platform, Go, Typescript, NodeJS, React, PostgreSQL, Redis, Kubernetes, Rails, to name a few.

When you join Calendly, you get the opportunity to deliver on a product used by millions and known for its best-in-class quality. Help us continue to deliver critical features to our users with excellence.

On a typical day, you will be working on: 

• Collaborating within your team to build new features that are targeted at our highest impact enterprise customers
• Contributing to platform scaling initiatives
• Meeting regularly with Product and Design to fine tune requirements
• Attending agile ceremonies to help your team plan out their work and get it done
• Working across squads to improve Engineering practices at Calendly
• Reviewing implementation plans and pull requests from your peers
• Mentoring and coaching other team members

• 4-6 years of professional software development experience in a SaaS or technology-driven environment.
• Strong, hands-on full-stack engineering skills, with the ability to independently design, build, and ship production changes across frontend and backend systems
• Experience building and maintaining Node.js services that interface with distributed APIs, LLMs, or similar mixed-stack environments.
• Hands-on experience with Service-Oriented Architectures (SOA), microservices, and involvement in monolith-to-services modernization or large-scale refactoring initiatives.
• Proven ability to own features end-to-end, including technical discovery, design, implementation, testing, release, and ongoing maintenance.
• Strong analytical and problem-solving skills, with the ability to dissect complex systems, identify root causes of issues, and deliver scalable, maintainable solutions.
• A commitment to writing clean, reliable, and maintainable code, with an emphasis on readability, simplicity, and performance.
• Adaptability to new technologies, evolving architectural patterns, and changing organizational priorities.
• Experience using AI coding assistants (Copilot, Cursor, etc.) as productivity tools, with a clear understanding of generated code and the ability to defend implementation choices.
• Availability for participation in an on-call rotation, ensuring timely and effective responses to critical production issues outside of regular working hours.
• Authorized to work lawfully in the United States, as Calendly does not offer immigration sponsorship at this time.

This role may require occasional travel for company events, team collaboration, or offsites.