Calendly Tech Stack

Scheduling automation platform for sales, recruiting, and team collaboration

Software Development Atlanta, Georgia 501–1,000 employees Privately Held

Calendly operates a polyglot stack (Ruby on Rails, Node.js, React, Go) deployed on Kubernetes across GCP and AWS, with observability via Datadog and Elasticsearch. The company is scaling infrastructure for high throughput while adopting AI capabilities (noted in active projects as an AI notetaker feature), and the hiring mix is heavily weighted toward senior and staff engineers—suggesting platform architecture work and reliability hardening rather than feature velocity.

Tech Stack 28 technologies

Core StackKubernetes Ruby on Rails Node.js React Go PostgreSQL Redis TypeScript Jira AWS Datadog Elasticsearch Salesforce Gainsight Webpack Cypress Selenium Playwright JavaScript Python Jenkins Postman Adaptive Planning GCP Argo Workflows Git Buildkite

What Calendly Is Building

◆Challenges

Forecast accuracy
Scaling infrastructure for high throughput
Improving activation funnels
Improving incident response
Sustainable cloud usage
Maintaining strict reliability standards
Inefficient video production
Grow our team
Scaling category-defining product
Ushering ai era

▲Active Projects

Ai notetaker
Advanced verification methods for fraud prevention
Platform scaling initiatives
Contact management experience
Real-time monitoring and detection of safety threats
Scalable motion system
Process evolution
Core product architecture
Budgeting and forecasting process automation
Delivery process automation

Hiring Activity

Accelerating35 roles · 20 in 30d

Department

Engineering

Product

Design

Finance

Support

Data

Marketing

Seniority

Senior

Staff

Manager

Director

Junior

Lead

Principal

Notable leadership hires: Design Director

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About Calendly

Calendly provides a scheduling automation platform that removes manual meeting coordination for individuals, teams, and organizations. The product spans sales acceleration, recruiting workflows, relationship-building, and general team collaboration across 230 countries with more than 20 million users. Core infrastructure runs on Kubernetes with PostgreSQL and Redis backing a microservices architecture. Active development includes AI-driven note-taking, fraud prevention, real-time safety monitoring, and contact management enhancements alongside platform scaling and delivery automation initiatives.

HeadquartersAtlanta, Georgia

Company Size501–1,000 employees

Hiring MarketsUnited States

Frequently Asked Questions

What tech stack does Calendly use?

Calendly runs Ruby on Rails and Node.js backends with React frontends, deployed on Kubernetes across GCP and AWS. Data layer uses PostgreSQL and Redis. Observability relies on Datadog and Elasticsearch; testing uses Cypress, Selenium, and Playwright.

Where is Calendly headquartered?

Calendly is headquartered in Atlanta, Georgia. Current hiring is concentrated in the United States, with a 501–1,000 employee headcount.