Buildkite has secured a $21 million Series B funding round led by Airtree and OneVentures, aimed at furthering its mission to enhance developer productivity globally. The company's journey over the past nine years has been marked by evolution and introspection, particularly during the rapid changes brought by the COVID-19 pandemic. Co-founders went through a period of reflection to redefine their goals, resulting in the creation of Test Analytics, a tool designed to improve test suite reliability across different programming languages and CI systems, now processing over a billion tests weekly. This success demonstrates Buildkite's ability to expand beyond its initial focus on CI/CD pipelines, and the company is eager to tackle future challenges in software development. They invite interested parties to join their upcoming UnblockConf and subscribe to their newsletter for insights into new developments. Additionally, they express gratitude to their investors and offer support to fellow entrepreneurs by sharing the pitch deck that facilitated their recent funding success.