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Attack Readiness

Vulnerabilities start in code.
Find them before production does.

Manual and automated security review of your source code. Authentication flaws, cryptographic mistakes, logic errors, and supply chain risks found before they ship.

What is a code security review?

You know your application handles sensitive data. You have developers writing code that becomes your attack surface. You get a thorough review of your codebase by security engineers who understand both how code works and how attackers exploit it. A code security review combines automated static analysis (SAST) with manual expert review, covering application logic, cryptography, authentication, dependencies, and CI/CD pipeline configuration. You receive developer-oriented findings your team can act on immediately.

About this service

Code Security Review: security before deployment

Vulnerabilities originate in code. A code security review examines your source code for security flaws before they reach production. This is the most direct and efficient way to find and fix vulnerabilities early in the development process.

The team combines automated static analysis (SAST) with manual code review by experienced security engineers. Automated tools detect known patterns (SQL injection, XSS, hardcoded secrets) but generate false positives and miss context-dependent vulnerabilities. Manual review provides depth: business logic flaws, insecure architectural patterns, and subtle cryptographic mistakes are only found by a human expert.

The review covers not only application code but also configuration files, dependency management, and build pipelines. Supply chain attacks via compromised dependencies are a growing risk. The team checks that your dependency management is sound and that known vulnerable libraries are not in use.

Why this matters

Three code security problems that reach production undetected

  • SAST tools miss logic and context

    Automated scanners find pattern-based vulnerabilities but miss business logic flaws, insecure design decisions, and context-dependent risks. A human expert finds what tools cannot.

  • Cryptographic mistakes are easy to make, hard to spot

    Using the wrong algorithm, weak key sizes, predictable IVs, or rolling your own crypto: these mistakes are common and devastating. They are invisible to automated scans without cryptographic expertise.

  • Vulnerable dependencies introduce risk you did not write

    Most modern applications are 80% third-party code. Compromised or outdated libraries, transitive dependency risks, and supply chain vulnerabilities are an attack surface many teams do not actively manage.

What gets reviewed

Scope of the code security review

Application code (Java, C#, Python, JavaScript/TypeScript, Go, PHP, Ruby, Rust, C/C++)
Authentication and authorisation logic
Cryptographic implementations
Input validation and output encoding
Session management
Error handling and logging
Dependency management (package.json, pom.xml, requirements.txt, etc.)
Configuration files and secrets in code
API design and data validation
CI/CD pipeline configuration
Methodology

How DEFION conducts a code security review

01

Scoping

Identifying the codebase to review, focus areas, technology stack, and available documentation.

02

Automated analysis (SAST)

Scan with static analysis tools tuned to the technology stack for broad coverage.

03

Manual review

In-depth analysis of security-critical components by a security engineer: authentication, authorisation, cryptography, data flows.

04

Dependency analysis

Checking for known vulnerable dependencies and supply chain risks across package managers.

05

Reporting

Report with findings per module/component: description, risk, code location, and fix suggestion.

06

Developer workshop (optional)

Knowledge session with the development team covering found patterns and how to prevent them going forward.

What you receive

Deliverables

  • Technical report with findings per module/component
  • Per finding: description, risk, code location, fix suggestion
  • Dependency vulnerability overview
  • Secure coding recommendations for the technology stack in use
  • Optional: developer workshop on found patterns
Target audience

Who is a code security review for?

A code security review is most valuable when security needs to be validated before it reaches users, or when recurring vulnerabilities need to be addressed at the source.

  • Development teams that want to integrate security into the SDLC
  • Organisations preparing an application for go-live or compliance audit
  • Companies validating code quality after an acquisition or outsourcing
  • SaaS companies that want to give customers confidence in the security of their platform
Frequently asked questions

FAQ

Which programming languages are supported?
All common languages: Java, C#/.NET, Python, JavaScript/TypeScript, Go, PHP, Ruby, Rust, and C/C++. For less common languages, we discuss the options.
Is a code security review a replacement for a pentest?
No, they are complementary disciplines. A code review finds vulnerabilities in the source code; a pentest demonstrates whether those vulnerabilities are exploitable in a running environment. The combination is most effective.
How much code can be reviewed?
That depends on available time and codebase complexity. For large codebases we focus on security-critical components: authentication, authorisation, data processing, and cryptography. A full review of millions of lines requires proportionally more time.
What if we already use SAST tooling?
Then manual review adds extra value. SAST tooling detects patterns but generates false positives and misses context. Manual review filters the signal from the noise and finds what tools cannot.
How do you handle access to our code?
Access is arranged securely via a protected repository clone or secure file transfer. All data is processed according to ISO 27001 and securely deleted after completion. NDAs are signed in advance.

Ready to review your code for security issues?

Tell us your technology stack and objectives. We scope the review and start within days.