CircleCI

What CircleCI Does:

• Automatically builds and tests your code every time you push changes to your version control system (like GitHub, GitLab, Bitbucket).
• Helps detect bugs early in the development process.
• Supports deployment pipelines to various environments (staging, production, etc.).

Key Features:

• Easy Integration with GitHub, GitLab, Bitbucket.
• Docker Support — build and test inside Docker containers.
• Parallelism — run multiple jobs at the same time to speed up builds.
• Workflows — control how your jobs are sequenced (e.g., run tests, then deploy only if tests pass).
• Flexible Configuration — you control builds with a .circleci/config.yml file.
• Custom Environments — define specific versions of tools/languages your app needs.
• Insights Dashboard — analyze build/test performance over time.

Example CircleCI Flow:

1. Developer pushes code to GitHub →
2. CircleCI automatically triggers →
3. Build → Test → Deploy (based on your settings).

Used For:

• Web apps, APIs, mobile apps (iOS, Android).
• Automation of test cases (integration tests, unit tests, UI tests).