When Your Code Needs an Audit (and What Happens During One)

You don't know what you don't know about your codebase

Most companies request a code audit after something goes wrong. A security breach, a production outage that took 12 hours to fix, or a new CTO who opens the repository and asks "who wrote this?"

By that point, the audit is damage assessment. The better time is before things break.

When you need a code audit

Before acquiring a company. If you're buying a tech company and the code is the asset, you need someone independent to evaluate what you're actually getting. We've reviewed acquisition targets where the "proprietary platform" was 200 lines of Python wrapping an open-source tool.

After your founding engineers leave. Companies lose institutional knowledge when early engineers depart. An audit documents what exists, identifies undocumented dependencies, and flags areas where only one person understood the code.

Before scaling. Code that works for 1,000 users often collapses at 100,000. An audit stress-tests architecture decisions and identifies bottlenecks before they become outages.

When your release cycle keeps slowing. If shipping a feature that used to take a week now takes a month, something is wrong in the codebase. An audit tells you what.

Regulatory compliance deadlines. SOC 2, ISO 27001, and PCI compliance all require documented security practices. An audit identifies gaps before the official assessment.

What happens during a code audit

Phase 1: Automated analysis (days 1-3). We run static analysis tools across the codebase. These catch: security vulnerabilities (SQL injection, XSS, dependency vulnerabilities), code complexity metrics, test coverage gaps, and dependency health (outdated or abandoned libraries).

Phase 2: Architecture review (days 4-7). Senior engineers review the system architecture. How do services communicate? Where are single points of failure? Can the system scale horizontally? Is the data model appropriate? This is the part machines can't do.

Phase 3: Security deep-dive (days 5-8). We examine authentication, authorization, data encryption, API security, secret management, and OWASP Top 10 vulnerabilities. For healthcare and financial clients, we also check regulatory-specific requirements.

Phase 4: Report and roadmap (days 9-10). The deliverable is a prioritized report. Critical issues (fix immediately), important issues (fix within 30 days), improvements (plan for next quarter). Each finding includes the problem, the risk, and a specific recommended fix.

What a code audit is not

It's not a performance review of your engineers. Good engineers write imperfect code under deadline pressure. The audit evaluates the code, not the people.

It's not a rewrite recommendation. Nine times out of ten, we recommend targeted improvements, not a rewrite. Rewrites are proposed by companies that want to sell you a rewrite.

What we typically find

After dozens of audits, patterns emerge. The most common findings:

• Hardcoded secrets in source code (70% of codebases)
• No rate limiting on APIs (65%)
• Outdated dependencies with known CVEs (80%)
• Missing error handling in critical paths (60%)
• No automated tests for business logic (50%)

Frequently asked questions

How long does a code audit take? Two weeks for a typical application. Larger systems with multiple services: 3-4 weeks.

What does it cost? $15K-30K for a standard audit. Regulatory-focused audits (SOC 2 prep, PCI): $25K-50K.

Will you share findings with our board/investors? We deliver the report to you. What you share is your decision. Many clients share a summary with their board to demonstrate due diligence.

Think your code might have hidden risks? Schedule an audit before they surface.