What is CI/CD?

CI/CD (continuous integration/continuous delivery) is a software development practice that streamlines and automates the process of developing, testing, and deploying code to production. Teams use CI/CD to ship features faster, catch bugs earlier, and reduce the manual work involved in software releases.

CI/CD combines two (sometimes three) key practices:

• Continuous integration (CI): Automatically merging and testing code changes multiple times per day
• Continuous delivery/deployment (CD): Automatically preparing code for release (delivery) or pushing it straight to production (deployment)

Together, these practices create automated pipelines that simplify how development teams build, test, and release software, reducing deployment time from weeks to minutes while improving code quality.

CI/CD explained

Continuous integration (CI) and continuous delivery (CD) are critical parts of the software development lifecycle, but would you know off the top of your head what they mean and the key differences between them? Let’s do a quick refresher into CI, CD, and the other CD (continuous deployment) and how they fit together in CI/CD.

What is continuous integration?

Continuous integration (CI) means regularly and automatically merging code from multiple developers into a single shared repository. The main parts of a CI pipelines include:

• Automatic builds and tests: CI tools build and run tests on new code without manual steps, so conflicts and errors are identified quickly. If something breaks, developers are notified immediately so they can fix it before it becomes a bigger, more expensive problem later on.
• Rapid feedback: CI provides immediate insight into your app’s health after every change. This helps teams make smarter decisions, iterate faster, and tackle issues as they arise, resulting in more reliable and customer-focused software.

Continuous integration promotes an agile way of working by helping teams streamline development, reduce waste, and respond rapidly quickly to shifting market needs.

What is continuous delivery?

Continuous delivery (CD) builds on continuous integration by keeping code in a deployable state so teams can release with confidence at any time. It’s often confused with continuous deployment, but the distinction matters (more on that later). 

A continuous delivery pipeline typically includes:

• Manual deployments: Once tests pass, the release is packaged and staged, then held for approval before deployment.. Even if automated scripts are used for the deployment, they won’t run until a designated approver triggers them.
• Deploy-ready code: With continuous delivery, the codebase is always up to date and ready for production. The actual push to production is performed manually, giving a final human check before changes go live.

In summary, continuous delivery improves collaboration between development and operations and builds trust in the release process by providing teams with greater visibility and control.

What is continuous deployment?

Continuous deployment (CD) fully automates the release pipeline from code integration and testing through to production. Unlike continuous delivery, it doesn’t require human approval. A continuous deployment pipeline typically includes:

• Automatic deployments: After code clears all tests, it’s deployed straight to production automatically, with no manual sign-off.
• Frictionless releases: Continuous deployment lets teams deliver validated updates to customers instantly, cutting time to market.

In summary, continuous deployment removes slow, manual steps from the release process, helping to speed up delivery, and continuously deliver value to users.

CI/CD v DevOps: what’s the difference?

The list of similarities and differences between CI/CD and DevOps can be as long as your arm. In short:

• DevOps is a cultural philosophy and set of practices that emphasizes collaboration between development and operations teams.
  
• CI/CD is a specific technical practice within DevOps that automates the software delivery pipeline.

CI/CD is a key enabler of DevOps culture. You can practice CI/CD without full DevOps adoption, but mature DevOps organizations always use CI/CD. That being said, there’s a lot more to it, which we’ll explore in a DevOps guide soon so stay tuned.

What are the benefits of CI/CD?

CI/CD helps organizations stay on top of their continuous software development cycle while reducing bugs, code failures, and any other issues that may come up during the development process. Automating build, test and deployment steps with CI/CD helps teams move faster and work more efficiently together while improving quality and reducing risk.

Six of the core benefits of implementing CI/CD are:

What are the best practices of CI/CD?

A CI/CD pipeline is the automated sequence of steps that moves code from development into production. Typical stages are build, test, security scan, deploy, and monitor. You can run these manually, but automation is what makes CI/CD powerful. If you’re ready to speed things up, try these practical steps to get started:

Speed up the pipeline

• Use intelligent caching: Cache dependencies and build artifacts to avoid rebuilding unchanged components. This can reduce build times by 30-70%.
• Run conditionally: Only execute jobs when relevant files change. For example, skip frontend tests when only backend code is modified.
• Slim down Docker images: Use multi-stage builds and minimal base images to reduce image size by 50-80%, speeding up pulls and deployments.
• Parallelize where possible: Run independent test suites in parallel to cut total pipeline time.

Monitor what matters

• Track pipeline metrics: Monitor build duration, success rates, and failure patterns. Set SLAs, for example, builds complete in <10 minutes.
• Capture detailed logs: Store comprehensive logs and artifacts for at least 30 days to troubleshoot failures efficiently.
• Use dashboards: Create real-time dashboards showing pipeline health, deployment frequency, and mean time to recovery (MTTR) so the entire team has visibility.
• Set up alerts: Notify relevant teams immediately when pipelines fail or performance degrades.

Use resources wisely

• Right-size your runners: Match resources to actual needs. Don't use 8-core machines for tasks that need 2 cores.
• Leverage spot instances: Use cloud spot instances for non-critical workloads to cut compute costs by 60-90%.
• Clean up automatically: Delete temporary environments, artifacts older than 30 days, and stopped containers to avoid storage bloat.
• Implement resource quotas: Set limits per team or project to prevent runaway costs.

Scale without breaking things

• Create reusable components: Build shared pipeline templates and step libraries for consistency across projects.
• Use dynamic environments: Spin up isolated staging/preview environments automatically for each pull request, then tear them down when merged.
• Add approval gates: Require manual approval for production deployments while keeping earlier stages fully automated.
• Version your pipelines: Store pipeline configuration as code in version control alongside your application code.

Why CI/CD tools are essential for modern development

CI/CD tools are now critical to modern software development. They automate code integration, testing, and deployment to production so teams can collaborate better together.

In high-performing teams, being able to spot and fix issues quickly is crucial. CI/CD tools provide real-time feedback so developers can catch errors early, spend less time debugging, and ship reliable releases consistently. Some key features to look for in CI/CD tools include:

• ‍Automation first: Invest in tools that automate builds, testing, and deployment. Integration matters and the tool should plug into your existing version control system, issue tracker, and other parts of your stack without the need for awkward and complex workarounds.‍
• AI where it helps: Look for solutions that integrate AI smartly in ways that genuinely provide value by speeding delivery or cutting repetitive work, and not just bolted on for the sake of it‍
• Scalability and performance: Choose a tool that scales with your team and workload without sacrificing pipeline speed.‍
• Ease of use and support: Factor in the  learning curve and community and vendor support available; strong documentation and an active community are invaluable. 

There are dozens and dozens of tools out there to help with CI/CD, however, only Bitrise was built specifically for mobile CI/CD.

CI/CD with Bitrise

Bitrise CI delivers a complete CI/CD platform built exclusively for mobile, handling everything from code commit to app store release without the fragmentation of stitching together generic tools. Where traditional platforms force you to patch together separate solutions for building, testing, signing, and deploying mobile apps, Bitrise provides an integrated workflow that understands mobile's unique requirements from the ground up.

The platform automates the entire pipeline: intelligent build triggers respond to relevant code changes, parallel workflows run tests across simulators and real devices simultaneously, and automated code signing eliminates certificate-related delays. AI-powered build summaries and flaky test detection surface quality signals in pull requests, while Release Management coordinates phased rollouts and app store submissions across iOS and Android from a single dashboard.