What does a code audit deliverable actually look like?

A good code audit report has four components: (1) An executive summary — one page readable by non-technical stakeholders, covering overall health, top 3 concerns, and recommended action; (2) Findings by severity — critical (fix immediately), high (fix this quarter), medium (plan to address), and low (nice to improve); (3) Specific recommendations — not 'improve code quality' but 'refactor the payment module to separate business logic from API handling, estimated effort: 20 hours'; (4) Effort estimates for each finding so you can prioritize by impact per hour invested. Reports for small codebases might be 10–15 pages; deep due diligence audits for M&A can be 40–80 pages.

Can I do a code audit myself without hiring an external firm?

You can run automated checks yourself — npm audit for dependency vulnerabilities, a SAST tool like CodeQL for security patterns, PageSpeed Insights for performance, and SonarQube for code quality metrics. These tools surface issues that are knowable without human judgment. What automated tools miss is design and architectural problems: whether the separation of concerns is appropriate, whether the data model will support future requirements, whether the patterns are maintainable by someone who wasn't in the room. For a codebase health check before a big push, self-service tooling can be enough. For acquisition due diligence or a system you're inheriting, an experienced human reviewer is essential.

What can't a code audit tell you?

A code audit can't tell you whether the software solves the right problem or whether the business logic is correct — auditors review implementation quality, not product decisions. It can't predict performance under real user load without load testing data. It can't fully assess operational security without access to infrastructure and deployment processes, which are often out of scope. It can't make the fix-or-rebuild decision for you — it gives you the information to make that decision. And it can't tell you how long fixing issues will take with any precision, because the actual difficulty of a change depends on factors (team familiarity, downstream dependencies) that aren't visible in the code.

What to Look for in a Code Audit

What is a code audit? A code audit is a systematic, independent review of a software codebase that evaluates code quality, architecture, security, performance, test coverage, and maintainability. It produces a written report with specific findings, severity ratings, and actionable recommendations. Code audits are valuable before acquiring software, after inheriting a codebase, when performance degrades, or when you suspect technical debt is slowing your team down.

A code audit is an independent review of your software's codebase. It tells you what you actually have — the good, the bad, and the risky — so you can make informed decisions about what to do next.

You might need a code audit if you're:

Taking over software from a previous developer
Evaluating whether to fix or rebuild existing software
Performing due diligence before acquiring a company or product
Onboarding a new development team
Concerned about performance, security, or quality

This guide explains what a thorough audit covers and how to interpret the results. If you're not sure which kind of audit you need — pre-acquisition, security, performance, or a general health check — read our guide on what kind of code audits there are first. For developer experience (internal or external), see the DX audits section there; for internal DX frameworks and how to measure them, see Internal DX: frameworks and metrics.