Senior Full Stack Engineer, Calendar Platform

Calendly

About The Position

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. About the team & opportunity Our Mission We power Calendly's products with reliable, high-performance calendar data infrastructure. Our services provide the foundation for how users interact with their scheduling data, serving as the single source of truth across our platform. How you will contribute As a Senior Engineer on Calendly's Calendar Platform team, you will build and evolve the core infrastructure our products depend on. Your work will directly shape how millions of users access and interact with their calendar data. You will focus on critical platform services including: Core calendar data API development, building and scaling a new unified interface and underlying data infrastructure for calendar data across all Calendly products Synchronization services to maintain data integrity across internal systems and external providers like Google and Microsoft Search infrastructure using ElasticSearch to surface relevant calendar data for users Novel platform services as new product needs emerge Why this role matters Calendar data is central to the Calendly platform. As we grow, our products need fast, reliable access to this data through modern, resilient infrastructure. You will help us move beyond legacy patterns and build services designed for scale. The technical decisions you make will ripple across our entire product ecosystem. A day in the life of a Senior Full Stack Engineer at Calendly Building Calendar Infrastructure Design, develop, and maintain services our product teams depend on. You will work hands-on with Golang, Ruby/Rails, and PostgreSQL to build resilient systems handling high data volumes and complex synchronization requirements. Technical Leadership and Collaboration Contribute to architectural decisions for calendar platform services. Share your distributed systems expertise with engineers across the organization and help establish patterns for engineering excellence. Contribute To Critical Initiatives Own and contribute to significant projects from concept to production. Whether you're evolving the core calendar API, improving sync reliability, or optimizing search performance, you will deliver high-impact solutions with quality and reliability at the forefront. Cross-Functional Partnership Partner with product engineering teams, Data Platform, and Infrastructure to understand their needs and translate them into robust solutions. This is a highly collaborative team where your input shapes how we serve internal customers. Operational Excellence Ensure reliability and performance through thoughtful monitoring, testing, and incident response. Participate in on-call rotation for business-critical systems and drive continuous improvement based on operational learnings. What’s in it for you? Ready to make a serious impact? Millions of people already rely on Calendly’s products, and we’re still in the midst of our growth curve — 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.

Requirements

7+ years of software engineering experience at a SaaS or technology company with strong backend and distributed systems focus
Deep experience in service-oriented architecture, microservice patterns, and building resilient, scalable systems
Proven experience building and operating high-traffic, high-availability platforms in production
Strong proficiency building internal tools, frameworks, and SDKs other engineers use
Experience with API design and data synchronization across multiple external providers
Excellent problem-solving skills with the ability to diagnose complex system issues
Strong communication skills, able to explain technical concepts clearly to technical and non-technical stakeholders
Authorized to work lawfully in the United States of America as Calendly does not engage in immigration sponsorship at this time

Nice To Haves

Experience with Golang, Ruby/Rails, NodeJS/Typescript
Background in platform engineering roles
Experience decomposing monolithic applications into microservices
Familiarity with Google Cloud Platform, Kubernetes, PostgreSQL, Redis, Pub/Sub
Experience with ElasticSearch or similar search infrastructure

Responsibilities

Design, develop, and maintain services our product teams depend on.
Contribute to architectural decisions for calendar platform services.
Own and contribute to significant projects from concept to production.
Partner with product engineering teams, Data Platform, and Infrastructure to understand their needs and translate them into robust solutions.
Ensure reliability and performance through thoughtful monitoring, testing, and incident response.
Participate in on-call rotation for business-critical systems and drive continuous improvement based on operational learnings.