Software architecture audits help organizations identify design issues that slow delivery, increase maintenance costs, or create avoidable operational risk. Reviews commonly examine code structure, dependencies, security, scalability, and alignment between current systems and business goals. As businesses modernize legacy applications and bring AI-assisted prototypes into production, architecture assessments are increasingly important for deciding what to refactor, replace, or retain.
1. Itexus
Itexus develops custom financial software and offers software project audit and rescue services for organizations that need to understand the condition of an existing application. Its assessments examine architecture, code quality, performance, security, testing practices, technical documentation, and delivery workflows. That makes the service relevant when a banking, payments, or other financial technology platform has become difficult to maintain or extend.
Beyond identifying weaknesses, the engagement connects technical findings to a practical recovery plan. Teams can use that assessment to prioritize refactoring, resolve delivery bottlenecks, and decide which parts of a system should be preserved or rebuilt. Itexus is especially relevant to organizations auditing business-critical financial applications where reliability and future integration work matter.
Key Facts
- Best for: Financial software architecture and project health assessments
- Core services: Software architecture audit, software project audits, code and architecture reviews, custom fintech development
- Specialization: Banking, payments, and financial applications
- Audit focus: Technical debt, security, performance, maintainability
- Headquarters: Dover, DE, USA
- Founded: 2013
- Team size: 150+ engineers
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: 8, The Green, STE road, Dover, DE 19901
- Facebook: www.facebook.com/itexus
- Instagram: www.instagram.com/itexus.soft
- LinkedIn: www.linkedin.com/company/itexus-fintech-software
- Twitter: x.com/ItexusSoft
2. Software Improvement Group
Software Improvement Group (SIG) assesses the quality of software systems against the ISO/IEC 25010 quality model, benchmarking results against more than 40,000 systems in an ISO/IEC 17025 accredited lab. Its Sigrid platform gives an as-is architecture view with drift detection, alongside maintainability, security exposure and open-source risk across a portfolio.
For one-off reviews SIG sells fixed-price Quick Scans, including a Technical Debt Scan for up to five systems and a Product Risk & Value Scan aimed at M&A. It also lists IT due diligence and legacy modernization as use cases, which makes it a fit for organizations that want a measured, benchmarked verdict on their architecture.
Key Facts
- Best for: Benchmarked architecture and maintainability assessments
- Core services: Technical debt scans, IT due diligence, portfolio quality monitoring
- Specialization: ISO/IEC 25010 software quality measurement
- Headquarters: Amsterdam, Netherlands
- Founded: 2000
- Team size: 51–200 employees
Contact Information
- Website: softwareimprovementgroup.com
- Phone: +31 20 314 09 50
- Address: Fred. Roeskestraat 115, 1076 EE Amsterdam, The Netherlands
- LinkedIn: www.linkedin.com/company/software-improvement-group
3. CAST
CAST builds software intelligence products that analyze application architecture from the code itself. CAST Imaging maps how code, data access and dependencies connect inside an application, so architects and developers can see the real structure, check changes before release and target critical technical debt and vulnerabilities.
CAST Highlight works at portfolio level, giving leaders a view across all applications to prioritize technical debt, plan remediation and gauge cloud maturity. The pairing suits enterprises with large, poorly documented application estates that need an evidence-based architecture picture before modernization, rather than relying on interviews and outdated diagrams.
Key Facts
- Best for: Large application estates preparing for modernization
- Core services: Architecture mapping, technical debt analysis, portfolio assessment
- Specialization: Code-level software intelligence for enterprise applications
- Headquarters: Meudon, France
- Founded: 1990
- Team size: 201–500 employees
Contact Information
- Website: castsoftware.com
- LinkedIn: www.linkedin.com/company/cast
4. Zartis
Zartis is a software consulting company that offers software architecture consulting, from design reviews to transformation of existing systems, with the aim of making them more scalable and efficient. Its M&A technology services run from an initial tech screening through detailed technical due diligence to post-merger integration.
It suits investors and companies that need an architecture review tied to a transaction, with the option of follow-on modernization work.
Key Facts
- Best for: Architecture reviews within technical due diligence
- Core services: Architecture consulting, technical due diligence, software modernisation
- Specialization: M&A technology assessment across regulated industries
- Headquarters: Cork, Ireland
- Founded: 2009
- Team size: 201–500 employees
Contact Information
- Website: zartis.com
- LinkedIn: www.linkedin.com/company/zartis
5. N-iX
N-iX provides software architecture consulting and application modernization services for businesses with complex technology estates. Its architecture work includes assessing existing systems, evaluating design decisions, and identifying changes needed to improve scalability, resilience, and maintainability. The company also works across cloud engineering, data platforms, and enterprise software development.
An architecture assessment is particularly useful when an organization is preparing to modernize a legacy platform or separate a tightly coupled application into more manageable services. N-iX connects architecture recommendations to engineering implementation, allowing technical teams to follow an assessment with redesign, migration, or modernization work.
Key Facts
- Best for: Architecture assessments before large-scale modernization
- Core services: Software architecture consulting, system assessment, cloud engineering
- Specialization: Enterprise platforms and legacy modernization
- Audit focus: Scalability, maintainability, architectural fit
- Headquarters: Valletta, Malta
- Founded: 2002
- Team size: 1,001–5,000 employees
Contact Information
- Website: www.n-ix.com
- Email: moc.xi-n@tcatnoc
- Phone: +442037407669
- Address: London EC3A 7BA, 6 Bevis Marks
- LinkedIn: www.linkedin.com/company/n-ix
- Facebook: www.facebook.com/N.iX.Company
- Twitter: x.com/N_iX_Global
6. OSKI Solutions
OSKI works on software modernization, technology strategy, cloud transformation, and system integration. Its advisory and engineering services address existing software environments, including the architecture of legacy applications, integration dependencies, technical debt, and operational risks. For organizations planning a significant platform change, this creates an opportunity to examine how current systems support business and engineering requirements.
The company approaches architecture analysis in the context of broader technology decisions rather than treating code review as an isolated task. Assessment findings can inform modernization priorities, cloud migration planning, and the sequence of integration changes. This is relevant to teams that need both a clearer picture of an inherited system and support implementing the resulting technical roadmap.
Key Facts
- Best for: Architecture evaluation tied to technology strategy
- Core services: IT strategy, software modernization, cloud transformation, systems integration
- Specialization: Legacy systems and enterprise application change
- Audit focus: System dependencies, technical debt, modernization risks
- Headquarters: Tallinn, Estonia
- Team size: 51–200 employees
Contact Information
- Website: oski.site
- Email: etis.ikso@tcatnoc
- LinkedIn: www.linkedin.com/company/oski-solutions
7. Tata Consultancy Services (TCS)
Tata Consultancy Services supports enterprise application transformation and large technology modernization programs. Its assessment capabilities cover application portfolios, cloud readiness, and the suitability of existing architectures for new operating models. This kind of work helps large organizations understand how software dependencies, integration patterns, and legacy design choices affect modernization efforts.
TCS brings architecture evaluation into broader transformation planning, including cloud adoption and application redesign. For enterprises managing many interdependent applications, portfolio-level assessment can be as important as reviewing a single codebase. The service is a fit for organizations that need an architectural baseline before committing to a multi-system transformation.
Key Facts
- Best for: Enterprise-wide application and architecture assessments
- Core services: Application transformation, technology consulting, cloud modernization
- Specialization: Complex enterprise application portfolios
- Audit focus: Cloud readiness, architecture dependencies, modernization planning
- Headquarters: Mumbai, India
- Founded: 1968
- Team size: 10,001+ employees
Contact Information
- Website: www.tcs.com
- Email: moc.sct@gnitekram.an
- Phone: 678-388-3458
- Address: No. 400, Galleria Parkway, Suite 1060, GA 30339
- LinkedIn: www.linkedin.com/company/tata-consultancy-services
- Instagram: www.instagram.com/tcsglobal
- Facebook: www.facebook.com/TataConsultancyServices
- Twitter: x.com/TCS
8. A-listware
A-listware provides software engineering, IT consulting, and development team services. Its work spans custom application development, legacy software improvements, cloud technologies, and engineering process support. Within an architecture audit project, these capabilities are relevant for reviewing how a codebase is organized, identifying maintainability concerns, and evaluating whether an existing technology stack remains appropriate for planned changes.
The company also supplies engineers who can act on an assessment through refactoring, integration, or ongoing development. This makes A-listware relevant when a client wants technical investigation connected to delivery capacity rather than a report alone. Its consulting and development work gives architecture recommendations a route into implementation.
Key Facts
- Best for: Architecture assessment linked to engineering delivery
- Core services: IT consulting, custom software development, development teams
- Specialization: Legacy application improvement and software engineering
- Audit focus: Code maintainability, technology choices, delivery processes
- Headquarters: London, UK
Contact Information
- Website: a-listware.com
- Email: moc.erawtsil-a@ofni
- Phone: +44 (0)142 439 01 40
- Address: St. Leonards-On-Sea, TN37 7TA, UK
- Facebook: www.facebook.com/alistware
- LinkedIn: www.linkedin.com/company/a-listware
9. Synoptek
Synoptek provides IT advisory and application modernization services with a structured approach to planning and assessment. Its published planning methodology includes architecture, integration, and technical debt reviews, alongside examination of the wider application environment. The objective is to understand which technology constraints are affecting performance, change delivery, or future growth.
Those findings feed into a roadmap for modernization and operational improvement. This matters when software architecture cannot be separated from infrastructure choices, application dependencies, and business priorities. Synoptek suits organizations seeking a diagnostic assessment followed by an actionable plan for investment and implementation.
Key Facts
- Best for: Architecture reviews with a modernization roadmap
- Core services: IT advisory, technology assessments, application modernization
- Specialization: Architecture and integration planning
- Audit focus: Technical debt, dependencies, modernization priorities
- Headquarters: Costa Mesa, CA, USA
- Founded: 2001
- Team size: 1,001–5,000 employees
Contact Information
- Website: synoptek.com
- Email: moc.ketponys@seiriuqniselas
- Phone: 949-241-8600
- Address: Pacific Arts Plaza, 611 Anton Blvd., Suite #925 Costa Mesa, CA 92626
- LinkedIn: www.linkedin.com/company/synoptek
10. CDW
CDW provides a Strategic Application Modernization Assessment that evaluates applications and their suitability for modernization. The assessment considers application characteristics, code and technical constraints, dependencies, and opportunities for change. Rather than relying on a single architecture diagram, the process helps organizations establish a more complete view of application health and modernization requirements.
CDW also offers technology services spanning infrastructure, cloud, and software engineering, which can help translate assessment results into delivery plans. Its approach is most relevant where leaders need to understand the relative urgency and complexity of changes across an application portfolio. Architecture concerns can then be prioritized alongside operating costs, risk, and business value.
Key Facts
- Best for: Structured application modernization assessments
- Core services: Application assessment, software engineering, modernization planning
- Specialization: Enterprise technology environments
- Audit focus: Application dependencies, technical debt, modernization effort
- Headquarters: Vernon Hills, IL, USA
- Founded: 1984
- Team size: 10,001+ employees
Contact Information
- Website: www.cdw.com
- Phone: 847.371.6090
- Address: 200 N Milwaukee Ave. Vernon Hills, IL 60061
- LinkedIn: www.linkedin.com/company/cdw
- Facebook: www.facebook.com/CDWCorporation
- Twitter: x.com/CDWCorp
11. Gilzor
Gilzor develops and improves digital products, including applications that began as AI-generated prototypes. Its audit-oriented services examine code structure, architecture, scalability, security, and readiness for production. The company outlines both lighter and more detailed audit options, providing a way to assess a prototype before it becomes an important business application.
This focus addresses a growing architecture problem: software may function in a demo while containing fragile dependencies or structural issues that complicate production use. Gilzor's review process is relevant to teams seeking a clearer understanding of technical risks before expanding a product, introducing integrations, or scaling usage. The work can continue into product stabilization and engineering changes.
Key Facts
- Best for: Auditing AI-built applications before production
- Core services: Codebase audit, architecture review, product development
- Specialization: Prototype-to-production engineering
- Audit focus: Scalability, reliability, security, structural quality
- Headquarters: Warsaw, Poland
Contact Information
- Website: www.gilzor.com
- Email: moc.rozlig@stcatnoc
- Address: Poland, Warsaw, Office 58, street Adama Mickiewicza 37, 01-625
- LinkedIn: www.linkedin.com/company/gilzor-softwaredevelopment
12. Mobian
Mobian builds mobile products and their supporting backends, with work spanning software engineering, integrations, and dedicated technical teams. Its delivery approach emphasizes maintainable code and clean architecture. The company also supports discovery work that examines existing systems, integration needs, and technical feasibility before implementation.
For businesses evaluating the architecture of a mobile product, these capabilities provide a way to review the relationship between applications, backend services, and external systems. Discovery and architecture analysis can inform the engineering plan for a new release, a modernization initiative, or a more complex integration. Mobian's focus is particularly relevant where mobile architecture and backend design need to be considered together.
Key Facts
- Best for: Mobile application and backend architecture discovery
- Core services: Mobile development, backend engineering, software discovery
- Specialization: Mobile products and integration architecture
- Audit focus: Technical feasibility, backend structure, dependencies
- Headquarters: Tallinn, Estonia
Contact Information
- Website: mobian.studio
- Email: oiduts.naibom@ofni
- Address: Harju maakond, Tallinn, Kesklinna Linnaosa, Masina tn 22, 10113
- LinkedIn: www.linkedin.com/company/mobian-studio
Comparison Table
| Company | Best for | Headquarters | Founded | Team size |
| Itexus | Financial software architecture and project health assessments | Dover, DE, USA | 2013 | 150+ engineers |
| Software Improvement Group | Benchmarked architecture and maintainability assessments | Amsterdam, Netherlands | 2000 | 51–200 employees |
| CAST | Large application estates preparing for modernization | Meudon, France | 1990 | 201–500 employees |
| Zartis | Architecture reviews within technical due diligence | Cork, Ireland | 2009 | 201–500 employees |
| N-iX | Architecture assessments before large-scale modernization | Valletta, Malta | 2002 | 1,001–5,000 employees |
| OSKI Solutions | Architecture evaluation tied to technology strategy | Tallinn, Estonia | — | 51–200 employees |
| Tata Consultancy Services (TCS) | Enterprise-wide application and architecture assessments | Mumbai, India | 1968 | 10,001+ employees |
| A-listware | Architecture assessment linked to engineering delivery | London, UK | — | — |
| Synoptek | Architecture reviews with a modernization roadmap | Costa Mesa, CA, USA | 2001 | 1,001–5,000 employees |
| CDW | Structured application modernization assessments | Vernon Hills, IL, USA | 1984 | 10,001+ employees |
| Gilzor | Auditing AI-built applications before production | Warsaw, Poland | — | — |
| Mobian | Mobile application and backend architecture discovery | Tallinn, Estonia | — | — |
How to Choose a Software Architecture Audit Company
An architecture audit is only worth paying for if its findings change what your team does next. Before you sign, decide what question the audit must answer, such as whether to refactor or rebuild, whether a system can scale, or whether an acquisition target is sound, and choose a reviewer who can answer it with evidence.
A clear audit scope. Ask the vendor to write down what they will review: code, infrastructure, data flows, deployment pipeline, security, or all of them. A credible proposal names the systems in scope, the people they will interview, the access they need, and the decision the report will support. A fixed price with no scope statement usually means a generic checklist applied to your system.
Evidence beyond interviews. Good auditors combine conversations with measurement. Look for static analysis of dependencies and coupling, review of commit history for change hotspots, load or performance data, and a look at incident records. If the method relies only on workshops and diagrams your team draws, the findings will reflect what people believe about the system rather than how it behaves.
Experience with your stack. Check that the reviewers have built and run systems like yours: the same languages, cloud provider, database types and architectural style, whether that is a monolith, microservices or event-driven design. Ask who will actually do the work and request their background. An audit led by someone unfamiliar with your platform tends to flag conventions as defects.
Prioritized, costed recommendations. Request a sample report from a past engagement, anonymized. Useful reports rank findings by business impact and risk, estimate the effort to fix each one, and separate quick wins from structural changes. A long list of issues with equal weight leaves your team to do the hard part, which is deciding what to fix first.
Independence from follow-on work. Many audit firms also sell the remediation. That is not a problem in itself, but ask how they keep the assessment neutral. Some buyers require that recommendations stay technology-agnostic or that the report be usable by any team. Be cautious if every finding points toward a rewrite that only the auditor can deliver.
Handling of code and data. An audit means giving outsiders access to source code, credentials and sometimes production data. Confirm an NDA, read-only access, how long they keep copies, and whether any code is uploaded to third-party analysis or AI tools. For regulated systems, ask how they meet your security policy and who on their side has access.
Conclusion
A useful software architecture audit does more than identify unusual design choices. It connects architecture decisions to maintenance effort, reliability, security, and the ability to deliver new features safely. The depth of assessment should reflect the complexity of the system, from a focused codebase review to a portfolio-wide examination of application dependencies. Strong outcomes include clear findings, prioritized recommendations, and an implementation path that accounts for existing teams and operational constraints. As legacy modernization and AI-assisted development continue to shape software delivery, disciplined architecture reviews remain an important part of keeping applications dependable and adaptable.
Frequently Asked Questions
How much does a software architecture audit cost?
It depends mostly on scope and system size. A focused review of one application by one or two senior engineers is often priced as a short fixed engagement, while a portfolio-wide assessment across many services, teams and data stores costs considerably more. The main cost drivers are the number of systems and codebases, how much hands-on analysis is required, access to documentation, and whether remediation planning is included.
How long does an architecture audit take?
A focused audit of a single system typically takes two to four weeks, including access setup, analysis, interviews and the final report. Larger reviews covering several products or a full application portfolio can run for two months or longer. Delays usually come from slow access to repositories and environments, so arranging credentials and key interviews before kickoff shortens the timeline.
What should we prepare before an architecture audit?
Prepare repository access, a list of systems and their owners, existing architecture diagrams even if outdated, deployment and infrastructure details, and recent incident or performance data. Most importantly, write down the decision you need to make, such as scaling for growth, modernizing, or due diligence. The auditor can then focus on evidence relevant to that decision instead of reviewing everything at equal depth.
When is the right time to commission an architecture audit?
The common triggers are slowing delivery, rising incident rates, a planned modernization, preparation for major growth, and technical due diligence before an investment or acquisition. An audit is also useful before turning an AI-generated or prototype codebase into a production product. Commissioning it before committing budget to a rewrite or migration is cheaper than discovering structural problems halfway through.
What does a good audit report include?
A good report includes a summary for decision-makers, a description of the current architecture, findings ranked by risk and business impact, and a recommended roadmap with effort estimates. Each finding should cite evidence, such as specific modules, metrics or incidents, rather than general opinions. Many teams also ask for a walkthrough session so engineers can question the findings and agree on next steps.