Checklist for Code Review

Standard Operating Procedure: Engineering Code Review Protocol (ECRP-001)

1. Document Control Block

• Document ID: TR-SOP-ENG-001
• Effective Date: 2023-10-27
• Version: 4.2.0
• Review Cadence: Quarterly (Q1, Q2, Q3, Q4)
• Target Audience: Engineering, Quality Assurance, and DevOps Departments

2. Executive Summary & Scope

This SOP defines the rigorous standards required for peer-reviewing source code within the Template Registry ecosystem. The objective is to maintain system integrity, ensure regulatory compliance (SOC2/GDPR), and mitigate technical debt. This procedure applies to all pull requests (PRs) targeting protected branches. Failure to adhere to these standards constitutes a breach of operational protocol.

3. Prerequisites & Tool Requirements

• Access: Active GitHub Enterprise credentials with read/write access to the specific repository.
• Software: Integrated Development Environment (IDE) with official linting plugins enabled.
• Systems: Verified connectivity to the Template Registry CI/CD pipeline (Jenkins/GitHub Actions).
• Certification: Peer Reviewer must hold "Senior Engineer" or "Lead Architect" status, or have completed the internal Code Reviewer Certification (CRC-101).

4. Roles & Responsibilities (RACI Matrix)

5. Step-by-Step Operational Procedure

Phase I: Pre-Review Validation

• Ensure all automated CI/CD pipeline tests (Unit, Integration) pass with a green status.
• Confirm code style matches the language-specific .editorconfig or linting ruleset.
• Validate that the PR contains a clear, concise description linking to the Jira/Ticket ID.

Phase II: Functional & Security Review

• Security: Inspect for hardcoded secrets, API keys, or sensitive PII exposure.
• Logic: Verify the code fulfills the stated business requirement without introducing regressive behavior.
• Performance: Analyze cyclomatic complexity; identify N+1 query patterns or inefficient memory allocation.
• Documentation: Ensure all new functions/modules contain necessary Docstrings and architectural comments.

Phase III: Approval & Merge Protocol

• Resolve all "Blocking" comments within the thread.
• Confirm final peer approval (Minimum of two approvals for production-critical code).
• Verify squash-and-merge configuration to maintain a clean git history.

6. Quality Assurance & Verification Criteria

• Tolerance Threshold: Zero tolerance for "Major" severity security vulnerabilities.
• Code Coverage Requirement: Minimum 85% branch coverage for new features.
• Acceptance Benchmark: Code must be human-readable, modular, and adhere to DRY (Don't Repeat Yourself) principles.
• Audit Trail: All reviews must be recorded via the VCS (Version Control System) platform to ensure a complete audit log for SOC2 compliance.

7. Practical Troubleshooting Scenarios

Scenario A: Unresolved Disagreement between Author and Reviewer

• Failure: Author and Reviewer reach an impasse on technical implementation strategy.
• Corrective Action: Escalate to the Engineering Manager immediately. A "Tie-Breaker Session" (max 15 mins) is required to decide the architectural direction. Document the resolution in the PR comments.

Scenario B: CI/CD Pipeline Failure (Flaky Tests)

• Failure: PR fails pipeline checks due to non-deterministic (flaky) tests unrelated to the new code.
• Corrective Action: Do not approve the PR. Log a separate ticket for the flaky test failure. Request the Author to stabilize the test environment before the PR can be processed.

Scenario C: Unauthorized Change Injection

• Failure: Reviewer identifies code changes that fall outside the stated scope of the ticket.
• Corrective Action: Reject the PR. Instruct the Author to remove extraneous changes or create a separate PR to maintain the principle of atomic commits.