Services Secure Code Review Services
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Secure Code Review Services

Secure code review identifies vulnerabilities in application source code that runtime testing typically misses, business logic flaws, race conditions, authorisation gaps, cryptographic mistakes, and language-specific weaknesses. It is the most cost-effective way to find application vulnerabilities, especially when integrated into your development lifecycle.

RedSecLabs delivers manual secure code review by senior application security practitioners across the major language ecosystems: Java.NET, Python, Node.js, Go, Ruby, PHP, mobile (iOS/Android), and embedded C/C++. We combine SAST tooling output with deep manual review, producing findings developers can act on without arguing with the report.

Our code review service runs as standalone engagements, pre-release security gates, or integrated SDLC support, whichever fits your development model.

CREST Certified Pen Test Provider ISO Certified OSCP Certified Industry Certification

Free Security Quote

Just a few questions to scope your project. We respond the same business day.

✓ UK-based CREST member · ✓ QSA-aligned methodology · ✓ Same-day scoping response · ✓ Executive + technical reports · ✓ Retest included
All major
Languages and frameworks
Manual
Senior reviewer-led
OWASP
Top 10 and beyond
SDLC
Integration options

What is secure code review?

Secure code review is the disciplined examination of application source code to identify security vulnerabilities, including those that runtime testing (DAST, penetration testing) cannot find. It combines automated static analysis (SAST) with manual review by experienced security practitioners.

Manual review is essential because most material application vulnerabilities are not pattern-matchable: business logic flaws, authorisation bypasses, race conditions, complex injection patterns, cryptographic misuse. Tooling catches the easy stuff; experienced reviewers find what tooling cannot.

What our secure code review delivers:

Identification of business-logic and authorisation flaws

Coverage of language-specific weaknesses (Java deserialisation, PHP type juggling, etc.)

OWASP Top 10 systematic coverage

Findings developers can act on without dispute

Evidence supporting PCI DSS, ISO 27001, SOC 2

Optional SDLC integration to prevent recurring issues

Code review is the highest-ROI application security investment for any organisation with custom-developed software, finding and fixing issues in source is dramatically cheaper than fixing them in production.

Why code review matters

Modern applications contain enormous amounts of custom code, each line a potential vulnerability. Penetration testing finds runtime exploitable issues; code review finds the underlying defects, including dormant vulnerabilities that may become exploitable as the application evolves. The two are complementary.

For organisations subject to PCI DSS, SOC 2, or ISO 27001, secure code review is increasingly expected as part of secure development lifecycle evidence. For organisations with significant intellectual property in software, it is the strongest defence against subtle vulnerabilities that would be devastating if exploited in production.

Common consequences of weak code review practice:

Business logic vulnerabilities reaching production undetected

Authorisation flaws enabling privilege escalation

Injection vulnerabilities tooling misses

Cryptographic implementation mistakes

Race conditions and concurrency vulnerabilities

Compliance gaps on secure development requirements

Strong code review practice systematically reduces the rate of production vulnerabilities and accelerates time-to-fix for issues that do escape into deployment.

Who needs secure code review?

Any organisation maintaining custom-developed software benefits from periodic code review. RedSecLabs delivers across:

SaaS and B2B technology

Financial services applications

Payment and fintech platforms

HealthTech and clinical applications

Mobile application developers

Defence and government software

AI and ML platform code

E-commerce platforms (PCI scope)

If your custom code handles sensitive data, processes payments, or makes authorisation decisions, periodic secure code review is core hygiene, not optional polish.

Our Code Review Methodology

An eight-stage methodology combining SAST tooling output with manual review by senior application security practitioners.

01

Scoping & Codebase Familiarisation

We understand the application architecture, data flows, authentication and authorisation model, and threat profile before reviewing any code.

02

SAST Tool Run

Multiple SAST tools (Semgrep, CodeQL, language-specific scanners) run across the codebase to surface pattern-matchable issues for manual triage.

03

Tool Output Triage

Senior reviewers triage SAST output, most tool findings are noise; the valuable ones become starting points for manual investigation.

04

Manual Logic Review

Targeted manual review of authentication, authorisation, session management, data validation, and business logic, the areas tools cannot meaningfully review.

05

Language-Specific Weakness Hunt

Focused review for language-specific weaknesses: Java deserialisation, PHP type confusion, Python pickle.NET binding, JavaScript prototype pollution.

06

Cryptographic Implementation Review

Detailed review of any cryptographic code, key management, algorithm choice, IV/nonce handling, padding, random number generation.

07

Findings Validation & Reporting

Each finding validated with code reference, exploit scenario, and concrete remediation guidance, no theoretical findings without practical impact.

08

Developer Walk-Through

Live walk-through with your engineering team to confirm findings are understood and remediation paths are agreed before delivery is complete.

Typical engagement: 30,000-50,000 LOC reviewable in 2 weeks, 100,000+ LOC requires 4+ weeks. We scope based on critical-path code, not raw line count.

What you receive

Every secure code review engagement with RedSecLabs includes:

  • Application architecture and threat model summary
  • Detailed findings report with code references and exploit scenarios
  • Severity rated using CVSS plus exploitability context
  • Concrete remediation guidance with code samples
  • Developer walk-through session with engineering team
  • SAST tooling configuration recommendations for ongoing use
  • SDLC integration recommendations
  • Compliance-ready evidence for PCI DSS, ISO 27001, SOC 2

Industries We Serve

We deliver this service across these industries:

Financial Services
Healthcare
SaaS & Technology
E-commerce & Retail
Defence & Government
Cloud & Managed Services
Education
Professional Services

Why RedSecLabs for code review

Our reviewers are practitioners who have shipped secure code themselves, not generalists running SAST tools and forwarding the output. Findings come with code samples developers can apply, not "secure your inputs" generalities. Engineering teams tell us our reviews are the rare ones they actually want to act on.

Senior application security reviewers
Java.NET, Python, Node, Go, Ruby, PHP, Mobile
Business logic and authorisation focus
OWASP Top 10 and language-specific coverage
Developer walk-through included
SDLC integration options

Get Your Codebase Reviewed

Book a free 30-minute scoping call. Codebase walk-through, scope confirmation, fixed-fee quote within a week.

Book a Scoping Call Contact Us

Where to next

Related services and industry packages worth exploring.

Web App Pentesting

API Pentesting

SaaS & Technology package

Frequently Asked Questions

All major web/backend languages: Java.NET (C#, VB), Python, Node.js, Go, Ruby, PHP, Scala, Kotlin. Mobile: Swift, Objective-C, Kotlin, Java. Embedded: C, C++. Frontend: JavaScript, TypeScript including framework-specific patterns (React, Angular, Vue). Database stored procedures: T-SQL, PL/SQL. Smart contracts: Solidity.

A typical 2-week engagement reviews 30,000-50,000 lines of meaningful code (excluding tests, generated code, vendored dependencies). Complex security-critical code (cryptography, authorisation logic) takes longer per line; routine CRUD code is faster. We scope based on critical-path code rather than raw line count.

Yes, but as input rather than output. SAST tools (Semgrep, CodeQL, language-specific tools) surface pattern-matchable issues that become starting points for manual investigation. The valuable findings come from manual review of authentication, authorisation, business logic, and language-specific weaknesses, areas tools cannot meaningfully cover.

Yes, we offer SDLC integration as a follow-on service. This typically includes SAST tool configuration in your pipeline, security review of all PRs touching critical paths, security-aware code review training for senior engineers, and periodic full-codebase reviews of new components. Pricing structured on retainer.

Yes. Solidity smart contract review is a specialised practice we deliver for DeFi protocols, NFT platforms, and other Web3 projects. The methodology differs significantly from traditional code review (focus on reentrancy, integer overflow, access control, MEV) and we staff with reviewers specifically experienced in Solidity audit.

Per-engagement reviews £8,000-£40,000 depending on codebase size, language complexity, and scope. Retained SDLC integration £4,000-£15,000 per month. Smart contract reviews £15,000-£60,000+ depending on protocol complexity. Fixed-fee quotes after scoping.
Before you decide
Download a sample report →
A redacted RedSecLabs penetration test report. See the format, depth, and clarity your team will receive.
Talk to us
Book a scoping call →
A 30-minute call covers realistic effort, timeline, and a fixed-scope quote. CREST-aligned methodology, UK-based testers.
What you receive

Every engagement includes

  • ✓ Scoping call. A 30-minute call to define scope, timeline, and authorisation boundaries.
  • ✓ Test plan. Written test plan covering targets, methodology, and rules of engagement.
  • ✓ Technical report. Detailed findings with reproduction steps, evidence, and remediation guidance.
  • ✓ Executive summary. Board-ready summary with risk ratings and business impact.
  • ✓ Audit-ready evidence. Findings letter formatted for auditors, customers, and supervisory authorities.
  • ✓ Retest letter. Free retest of remediated findings within agreed window. Confirmation letter included.
  • ✓ Remediation call. A call with our lead tester to walk through findings and remediation strategy.
How we deliver

Our process, end to end

  1. 1
    Scoping call & fixed-scope quote
    A 30-minute call. We define scope, targets, timeline. You get a fixed-scope quote within one working day.
  2. 2
    Test plan & authorisation
    Written test plan covering methodology, targets, and rules of engagement.
  3. 3
    CREST-aligned execution
    Senior tester runs the engagement. Critical findings flagged immediately during testing.
  4. 4
    Technical + executive report
    Detailed technical findings with reproduction steps. Board-ready executive summary.
  5. 5
    Remediation call & retest
    Walkthrough with our lead tester. Retest of remediated findings within the agreed window.
Engagement scope

What shapes the quote

Small scope
Focused scope, smaller surface. 5-7 working days.
Medium scope
Multi-role, several integrations. 8-12 working days.
Enterprise scope
Complex environment, compliance evidence. 12-25 working days.
Fixed-scope quote within 1 working day
No surprise invoices. We commit to a number before you commit to us.
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