Continuous Integration and Delivery Pipelines Questions

Design and implement continuous integration and continuous delivery pipelines that reliably build, test, validate, and deploy applications and infrastructure. Topics include pipeline as code practices, defining stages and triggers for builds and tests, automated testing strategies across unit, integration, smoke, and end to end tests, gating and environment promotion, branching and release strategies, artifact management and versioning, and deployment patterns such as rolling updates, blue green deployments, and canary releases. Candidates should be able to design rollback and recovery procedures, integrate infrastructure provisioning into pipelines, select and configure pipeline tooling such as Jenkins, GitHub Actions, GitLab CI, Azure Pipelines, or cloud vendor pipeline services, and reason about observability and reporting for pipeline health and test execution. Practical considerations include environment parity, pipeline security, secrets handling, pipeline as code best practices, and trade offs between speed and safety.

EasyTechnical

38 practiced

Describe a simple and reliable rollback strategy for Kubernetes deployments when a new image causes failures. Include how to trigger rollback, how to preserve logs and metrics for post-mortem, and how to coordinate rollback with database changes.

MediumTechnical

32 practiced

Propose approaches to optimize CI/CD pipeline cost at scale (hundreds of builds per day). Cover caching strategies, build concurrency tuning, choice of runner types (on-demand vs reserved), artifact retention policies, and trade-offs between faster builds and higher cost.

HardTechnical

36 practiced

Describe how to implement automated metric-based canary analysis that decides to continue, promote, or rollback a release. Include data collection (Prometheus), metric selection, statistical tests (e.g., Bayesian or t-test), integration with CI/CD to control traffic shifts, and interaction with feature flags to mitigate risk.

EasyBehavioral

29 practiced

Tell me about a time when a CI/CD pipeline change caused a production outage or failed deployment. Describe the context, what triggered the issue, how you diagnosed and mitigated it, and what process or tooling changes you implemented afterward.

HardSystem Design

40 practiced

Design a CI/CD workflow that enforces supply chain security: generate SBOMs for builds, sign artifacts and images, verify signatures before deployment, scan for known vulnerabilities, and produce an auditable trail. Discuss tool choices (e.g., syft/cosign/sbom tools), where to run checks, and how to block deployments of non-compliant artifacts.

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