Source Code Review Providers

Source code review (also known as secure code review or code audit) is a systematic examination of an application's source code to identify security vulnerabilities, coding errors, and deviations from secure coding practices. Manual code review by experienced security engineers is combined with static application security testing (SAST) tools to analyse code for vulnerabilities including injection flaws, authentication weaknesses, cryptographic errors, insecure data handling, race conditions, and logic flaws.

Code review covers multiple programming languages and frameworks, examining both custom code and the use of third-party libraries and dependencies. This white-box approach finds vulnerabilities that black-box testing cannot detect, such as backdoors, insecure cryptographic implementations, and subtle logic errors.

Source code review is particularly valuable during the software development lifecycle (SDLC) as it allows vulnerabilities to be identified and fixed early, when remediation costs are lowest. It is recommended by compliance frameworks including PCI DSS, SOC 2, and NIST, and is essential for organisations developing security-critical applications, financial systems, healthcare platforms, and government software.

8 providers
Top UK ProviderElite TestersResearch-Driven
SECFORCE logo

SECFORCE

Leading UK offensive security consultancy based in Canary Wharf, delivering CREST-accredited penetration testing and adversary simulation to organisations with the most demanding security requirements.

95
Score
LOCLondon, United Kingdom
Web ApplicationNetworkMobile App+9
CRESTISO 27001Cyber Essentials
Best UK ProviderBest for EnterpriseResearch Leaders
NCC Group logo

NCC Group

Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.

75
Score
LOCManchester, United Kingdom
Web ApplicationNetworkMobile App+13
CRESTCHECKCBEST+6
Best OverallElite TestersResearch Pioneers
Bishop Fox logo

Bishop Fox

Premier US-based offensive security firm known for elite penetration testers, cutting-edge research, and the Cosmos continuous attack surface management platform.

50
Score
LOCTempe, Arizona, United States
Web ApplicationNetworkMobile App+8
SOC 2OSCP Employer
SEC Consult logo

SEC Consult

Leading European cybersecurity consultancy from Vienna with a prolific vulnerability research program and deep expertise in IoT and embedded systems security.

43
Score
LOCVienna, Austria
Web ApplicationNetworkMobile App+7
ISO 27001
IOActive logo

IOActive

Elite boutique security consultancy specializing in IoT, SCADA/ICS, embedded systems, and hardware security research with world-renowned researchers.

42
Score
LOCSeattle, Washington, United States
Web ApplicationNetworkIoT+7
OSCP Employer
Trail of Bits logo

Trail of Bits

Elite security research firm specializing in source code review, blockchain auditing, and building industry-standard open-source security tools.

41
Score
LOCNew York, New York, United States
Source Code ReviewWeb ApplicationAPI+3
OSCP Employer
Praetorian logo

Praetorian

Offensive security firm founded by former DoD professionals, offering elite penetration testing and the Chariot continuous attack surface management platform.

40
Score
LOCAustin, Texas, United States
Web ApplicationNetworkCloud+7
SOC 2
Cure53 logo

Cure53

Berlin-based specialists in web security, browser security, and cryptographic auditing, trusted by the world's leading VPN providers and privacy tools.

32
Score
LOCBerlin, Germany
Web ApplicationAPISource Code Review+2

Source Code Review FAQs

What programming languages can be reviewed?+

Professional code reviewers typically cover Java, C#, Python, JavaScript/TypeScript, Go, Ruby, PHP, C/C++, Swift, Kotlin, and other common languages. Specialist reviewers may cover embedded systems languages and proprietary platforms.

How is source code review different from automated SAST?+

Automated SAST tools find common patterns but produce false positives and miss complex logic flaws. Manual review by experienced engineers finds subtle vulnerabilities, validates automated findings, and assesses overall code quality.

How long does a source code review take?+

Duration depends on codebase size, complexity, and languages used. A focused review of critical components typically takes 5-15 days. Full application reviews of large codebases may take several weeks.