A code audit can uncover problems that are difficult to spot during routine development, from technical debt and weak architecture to security risks, outdated dependencies, and performance bottlenecks. The companies below approach code auditing from different angles, including mobile software, enterprise systems, fintech products, legacy applications, and security-focused source reviews.
1. Gilzor
Gilzor provides code audit services with a particular focus on mobile applications and existing digital products. Its technical assessments examine the areas that tend to create trouble as a product grows, including architecture, technical debt, dependencies, performance, security concerns, build pipelines, crash patterns, and compatibility issues.
The audit process is designed to give teams an independent view of the current codebase rather than simply identify isolated bugs. Findings can help product owners understand which technical issues deserve immediate attention and which can be handled as part of longer-term development. This can be useful for applications experiencing unstable releases, recurring defects, performance problems, or growing maintenance costs.
Key Facts:
- Best for: Mobile products requiring an independent technical assessment
- Core services: Code audit, architecture review, technical debt assessment, security checks, performance analysis
- Specialization: Mobile application codebases
- Location: Warsaw, Poland
- Notable strength: Assessment of code health alongside wider engineering risks
Contact Information:
- Website: www.gilzor.com
- E-mail: contacts@gilzor.com
- LinkedIn: www.linkedin.com/company/gilzor-softwaredevelopment
- Address: Poland, Warsaw, Office 58, street Adama Mickiewicza 37, 01-625
2. Net Devs
Net Devs works with enterprise codebases where an audit is often the first stage of a larger modernization project. Its assessment covers architecture, dependencies, security posture, testing coverage, risk areas, ownership costs, and technical constraints that can slow future development.
Rather than stopping at a list of code problems, the company connects audit findings with modernization planning. This can include identifying dependencies between changes, estimating engineering effort, and establishing a sequence for improving the system. Its broader engineering stack includes .NET, Java, Kotlin, Node.js, Python, Go, Azure, AWS, and Google Cloud.
Key Facts:
- Best for: Enterprise systems being assessed before modernization
- Core services: Software audit, code analysis, architecture review, modernization planning
- Specialization: Enterprise software
- Technologies: .NET, Java, Kotlin, Node.js, Python, Go, Azure, AWS, GCP
- Location: Warsaw, Poland
Contact Information:
- Website: net-devs.com
- Phone: +48 571 282 759
- Email: contact@net-devs.com
- LinkedIn: www.linkedin.com/company/net-devs
- Address: Obrzeżna 1D, 02-691 Warszawa
3. Lengreo
Lengreo provides code audit work alongside web and mobile development. Its technical review can examine source code for structural problems, security concerns, performance bottlenecks, and broader quality issues. This combination can suit businesses that want an external assessment but may also need engineering work after the audit is complete.
Its development capabilities extend across web and mobile products, giving the company scope to connect audit findings with practical remediation. Lengreo works with companies in areas including SaaS, software development, cybersecurity, fintech, healthcare, and Web3.
Key Facts:
- Best for: Web and mobile products requiring review and follow-up development
- Core services: Code audit, code review, performance analysis, web development, mobile development
- Specialization: Web and digital product engineering
- Industries: SaaS, software, cybersecurity, fintech, healthcare
- Locations: Amsterdam, Netherlands and Kyiv, Ukraine
Contact Information:
- Website: lengreo.com
- E-mail: hi@lengreo.com
- Twitter: x.com/Lengreo
- LinkedIn: www.linkedin.com/company/lengreo
- Instagram: www.instagram.com/lengreo.agency
- Address: Vrijstraat 9 C/D, 5611 AT Eindhoven, Netherlands
- Phone: +31 686 147 566
4. Itexus
Itexus handles code assessment through its Project Audit and Rescue work, with a strong emphasis on existing fintech products. The company reviews code quality, stability, security, and performance while also examining the technical problems that may be preventing a software project from moving forward.
Its work can extend beyond diagnosis into documentation recovery, refactoring, technology upgrades, and improvements to development processes. That wider scope is particularly useful for financial software where the codebase may have to support complex integrations, security requirements, and business-critical workflows.
Key Facts:
- Best for: Fintech products and software projects requiring technical recovery
- Core services: Project audit, code quality assessment, security assessment, performance review, refactoring
- Specialization: Fintech software
- Industries: Banking, payments, lending, trading, wealth management
- Location: Warsaw, Poland
Contact Information:
- Website: itexus.com
- Email: info@itexus.com
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
- Address: 8, The Green, STE road, Dover, DE 19901, United State
5. SoftPro
SoftPro works across custom software, web applications, cloud development, and AI-related projects. Code review forms part of its wider engineering work, making the company suited to organizations that need an existing codebase examined in the context of ongoing software development or maintenance.
Its technology experience includes .NET, ASP.NET, Azure, React, and Node.js. This gives SoftPro a practical role in projects where code quality questions are tied to application architecture, cloud infrastructure, future development, or the maintenance of established business software.
Key Facts:
- Best for: Businesses combining code review with ongoing engineering
- Core services: Code review, custom software development, web applications, cloud development
- Specialization: Business software and web applications
- Technologies: Azure, ASP.NET, .NET Core, React, Node.js
- Location: Warsaw, Poland
Contact Information:
- Website: soft-pro.pl
- Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401
6. OSKI Solutions
OSKI Solutions uses technical auditing as part of its legacy modernization and software support work. Audits can cover existing codebases, dependencies, integrations, data, and workflows, giving development teams a clearer picture of what needs attention before major changes begin.
This approach is particularly applicable to established applications that cannot simply be replaced. Audit findings can be used to identify fragile areas, introduce safeguards and testing, and plan incremental refactoring. OSKI works with technologies including .NET, Node.js, React, Angular, Umbraco, SQL Server, PostgreSQL, AWS, and Azure.
Key Facts:
- Best for: Legacy and business-critical software
- Core services: Codebase audit, dependency review, legacy assessment, modernization planning
- Specialization: Legacy modernization and enterprise software
- Technologies: .NET, Node.js, React, Angular, Umbraco, AWS, Azure
- Location: Tallinn, Estonia
Contact Information:
- Website: oski.site
- Phone: +48571282759
- Email: contact@oski.site
- LinkedIn: www.linkedin.com/company/oski-solutions
- Address: Kaupmehe tn 7-120, Tallinn, 10114, Estonia
7. A-listware
A-listware connects code review with a broader range of software engineering, application security, testing, and modernization services. Its work includes secure code review and other assessments intended to identify technical and security issues in existing applications.
The company’s wider service range can be useful when an audit is only one part of the project. Teams can combine code assessment with application testing, cybersecurity work, maintenance, modernization, or additional software development. A-listware works across industries such as fintech, banking, healthcare, retail, manufacturing, transportation, and telecommunications.
Key Facts:
- Best for: Teams combining code review with development or application security
- Core services: Secure code review, application security, software testing, modernization, development
- Specialization: Custom software and application services
- Industries: Fintech, banking, healthcare, retail, manufacturing, transportation
- Location: United Kingdom
Contact Information:
- Website: a-listware.com
- Phone: +1 (888) 337 93 73
- Email: info@a-listware.com
- LinkedIn: www.linkedin.com/company/a-listware
- Facebook: www.facebook.com/alistware
- Address: North Bergen, NJ 07047, USA
8. 21Century.Tech
21Century.Tech uses an AI-assisted engineering model in which senior developers remain responsible for architecture, business logic, security decisions, QA, and code review. Its work covers existing software as well as new development, including legacy refactoring, testing, documentation, integrations, and production deployment.
For code audit projects, that engineering model can support teams that need to examine existing code and then move directly into cleanup or refactoring. The company’s broader delivery process includes full-stack development, test coverage, documentation, CI/CD, and human review before production release.
Key Facts:
- Best for: Existing products requiring code review and subsequent refactoring
- Core services: Code review, legacy refactoring, software development, testing, documentation
- Specialization: AI-assisted software engineering
- Project types: MVPs, full-stack features, integrations, existing software refactoring
- Notable strength: Senior engineers retain responsibility for code review and final quality
Contact Information:
- Website: 21century.tech
- Email: kirill@oski.site
Conclusion
Code audit services vary considerably in scope. Some teams concentrate on source code quality and security, while others examine architecture, technical debt, dependencies, performance, testing, and the wider development process. The right scope depends on why the audit is being commissioned in the first place.
For an established product, it often makes sense to look beyond individual code issues and consider what happens after the assessment. A useful audit should leave the development team with a clearer picture of technical priorities, risks, and possible next steps, whether that means targeted fixes, refactoring, modernization, or a broader rebuild.
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