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CircleCI is a CI/CD platform that automates build, test, and deploy pipelines for UK engineering teams. Connect your GitHub or Bitbucket repo and every push triggers parallelised tests and deployments, with caching for speed. The free tier includes 6,000 build minutes/month; paid plans start at $30/month. It supports Docker, every major language, and integrates with AWS, Vercel, and Slack. CircleCI is GDPR compliant. It's a solid choice for UK startups already on GitHub that want robust, fast pipelines without managing CI infrastructure themselves.