Buildkite has quietly handled continuous integration for major tech names—OpenAI, Airbnb, Canva, Uber and Shopify—for seven to twelve years as they scaled. More recently, it’s added orchestration duties for a second wave of heavy hitters: Cursor, NVIDIA, Anthropic, Meta, Mistral, xAI, Discord, Reddit, Ramp, PlanetScale, Pierre and Bun. On top of that roster, Buildkite manages the pipelines behind key developer tools like vLLM, AWS Lambda, Bazel and Backstage. Their system launched in 2013 and today supports workloads that touch over a billion people every day. Instead of just running tests in sequence, Buildkite fan-outs tasks across agents in parallel and drills down into deep dependency trees. That means projects with thousands of moving parts can finish builds faster than if they relied on “one faster runner” or a monolithic CI service. You can tap into the same infrastructure for your own codebase through a 30-day trial. Sign-ups are open now, and you get full access to their orchestration and parallelization stack without upfront costs.