CircleCI was founded in 2011 by Paul Biggar and Allen Rohner in San Francisco. The company has raised over $315 million in total funding and processes more than 70 million builds per month as of 2023.
The platform supports both cloud-hosted and self-hosted runners. Developers configure their pipelines using a YAML file in their repository, and CircleCI handles the rest. It integrates tightly with GitHub, GitLab, and Bitbucket, triggering builds automatically on every commit or pull request.
One of CircleCI’s standout features is its caching system. It can cache dependencies, Docker layers, and build artifacts between runs, dramatically speeding up pipeline execution. The platform also supports parallelism — splitting test suites across multiple containers to reduce wait times. Teams have reported cutting their build times from 30 minutes to under 5 minutes using these features.
CircleCI Orbs are reusable configuration packages that simplify common tasks like deploying to AWS, sending Slack notifications, or running security scans. The marketplace has thousands of pre-built orbs maintained by both CircleCI and the community. In January 2023, the company dealt with a security incident that required all customers to rotate their secrets, which they handled transparently. CircleCI serves over 30,000 organizations, including Spotify, Ford, and Samsung.
