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.

• Buildkite scales to 1,000–100,000+ concurrent CI runners across your own infrastructure, theirs, or a hybrid setup.
• Built-in flaky-test detection auto-quarantines problem tests and splits large suites across runners.
• Includes artifact caching and supply-chain security features alongside universal pipeline triggers for chaining workflows.
• Offers a 30-day full-access trial with no credit card required.