Buildkite has run continuous integration pipelines for companies like OpenAI, Airbnb and Shopify since 2013. It handles deep parallelization and task orchestration to keep large build queues moving. A 30-day all-access trial is available.

Buildkite lets you run CI agents on your servers, theirs, or both, supporting anywhere from 1,000 to 100,000+ concurrent runners. It offers deep parallelization, flaky-test detection with auto-quarantine, test splitting, artifact caching, supply-chain security, and universal pipeline triggers. You can start a 30-day trial with no credit card required.