Code Review Checklist Examples

Standard Operating Procedure: Code Review & Quality Assurance Protocols

Document Control Block

• Document ID: TR-OPS-ENG-042
• Effective Date: 2023-10-27
• Version: 4.1.0
• Review Cadence: Quarterly (Q-Cycle)
• Target Audience: Software Engineering, Quality Assurance (QA), DevOps, Security Compliance

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1. Executive Summary & Scope

This procedure mandates the systematic evaluation of source code integrity prior to integration into the Template Registry core repository. It defines the operational boundaries for peer review, ensuring compliance with ISO/IEC 27001 standards and internal security posture. Scope is restricted to all Pull Requests (PRs) involving production, staging, or infrastructure-as-code (IaC) branches.

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2. Prerequisites & Tool Requirements

• Access: Active Read/Write permissions on the Template Registry GitHub Enterprise instance.
• Toolchain: git, pre-commit hooks, and IDE-integrated linting (ESLint/Pylint/SonarQube).
• Certification: Peer Reviewer Accreditation (Internal Training Module: TR-CERT-CR-01).
• Safety: VPN connectivity with active MFA secondary authentication token.

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3. Roles & Responsibilities (RACI Matrix)

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4. Step-by-Step Operational Procedure

Phase I: Automated Validation (Pre-Review)

• Ensure all automated CI/CD pipeline tests (Unit/Integration) have returned a "Pass" status.
• Verify static analysis tool (SonarQube) reports zero critical/blocker vulnerabilities.
• Confirm no secrets, API keys, or plaintext credentials exist in the file diff.

Phase II: Architectural Review

• Verify alignment with existing design patterns (e.g., Singleton, Factory, Repository).
• Confirm code modularity; ensure logic is not tightly coupled to external dependencies.
• Validate adherence to internal Naming Conventions and Type Annotations.

Phase III: Security & Performance Audit

• Assess input sanitization protocols for all external API endpoints.
• Verify O(n) complexity of loops/recursive functions; ensure no bottlenecking in production loops.
• Validate resource cleanup (e.g., database connection disposal, memory deallocation).

Phase IV: Final Approval

• Document all constructive feedback in the PR thread using conventional comment syntax.
• Ensure all blocking comments are resolved or addressed by the author.
• Final sign-off provided by the designated "Accountable" engineer.

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5. Quality Assurance & Verification Criteria

• Tolerance Threshold: Zero tolerance for security vulnerabilities (Severity High/Critical).
• Benchmarks:
  • Minimum 85% unit test coverage for new modules.
  • Zero "Technical Debt" linting violations.
  • PR merge latency < 48 hours for standard features.

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6. Practical Troubleshooting Scenarios

Scenario A: The "Scope Creep" Pull Request

• Observation: Reviewer identifies unrelated refactoring mixed with core feature implementation.
• Corrective Action: Apply "Reject" status. Request the developer cherry-pick changes into distinct, atomic commits/branches.

Scenario B: Performance Degradation Detected

• Observation: Proposed code introduces an $O(n^2)$ lookup in a high-traffic service module.
• Corrective Action: Flag as a "Blocker." Provide documentation for optimal data structures (e.g., HashSets/Trie) and request performance benchmarking logs.

Scenario C: Build Failure in CI Pipeline

• Observation: Local environment matches tests, but pipeline fails due to environment-specific dependency drift.
• Corrective Action: Halt review. Require the author to synchronize local Docker environment configuration with the current CI image before re-submission.

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Authorized by: Julian Vance Chief Operations Architect, Template Registry