Reviewed by Björn Groenewold, Dipl.-Inf. · Software engineering since 2010 · Last updated September 3, 2026 · Made in Germany in Leer, East Frisia. Figures without a named external source are Groenewold IT project-planning ranges, not guarantees.
Many organisations have software that works but they don't know how it will hold up as they grow. A legacy code analysis replaces guesswork with facts.
We inspect source code, architecture and infrastructure for real risks. These include security gaps, outdated dependencies and maintainability bottlenecks.
You get a prioritised action plan, not a generic checklist. It separates stable areas, urgent work and valuable modernisation opportunities.
Refactor, partly rebuild or migrate to a new stack – the analysis gives you the evidence to decide.
Project references
Concrete examples with measurable outcomes — swipe through matching references or open the full case study.
Detailed findings with severity ratings, code examples and concrete recommendations
Prioritised action plan with effort estimates, risk levels and quick wins
Whether to refactor, partially rebuild or start fresh – we tell you what makes economic sense
A legacy code analysis is the essential first step before investing in modernisation.
We assess code quality, technical debt and security risks across your existing software. The evidence supports informed investment decisions.
The review covers architecture, dependencies, test coverage and compliance. Its roadmap prioritises actions and estimates the required effort.
Technical debt accumulates silently. What starts as a shortcut during a sprint becomes an architectural constraint that affects every future change.
Our analysis quantifies that debt so you can budget for it and address it strategically rather than reactively.
We have assessed Delphi, Java, .NET, PHP, Python and JavaScript codebases. They range from desktop monoliths to distributed microservices.
Every analysis ends with a stakeholder presentation. We explain risk exposure, modernisation effort and expected returns in clear business terms.
This ensures both technical teams and decision-makers have a shared understanding of the path forward.
The analysis is the entry point to our broader replace legacy software hub. The report remains useful if you implement with us or brief another vendor. It also supports targeted modules through modernising your legacy software. There is no obligation to continue with us.
On the scheduling page, pick a free slot for a 30-minute intro call about Legacy Code Analysis – straightforward next steps.
Free & non-binding · 30-minute intro call
Book next available slotFrequently Asked Questions
We review code quality, architecture, performance and security.
Every finding documents severity, impact and estimated effort. You also receive a prioritised modernisation roadmap.
The standard assessment takes exactly five working days from kick-off to presentation.
Day one covers access, while days two to four cover analysis. On day five, we present the risk report. A larger codebase can require two to four weeks. We estimate that duration after an initial scoping call.
We offer a fixed price; there are no hidden costs.
The exact price is agreed in an initial call.
You receive a detailed report and a prioritised roadmap.
We present every finding to your team. We can support later modernisation, but there is no obligation. Many clients use the report to brief internal teams or other vendors.
No.
We work with your source repository and build configuration. When relevant, we request anonymised database schemas or API documentation. We never require live-system or customer-data access.
Get clarity about your legacy code
A thorough analysis today prevents costly surprises tomorrow.
A thorough analysis today prevents costly surprises tomorrow. Let us assess your codebase.
Legacy code analysis and due diligence before budget decisions—not modernization delivery on legacy modernization.
After analysis, interfaces and integration via API integration and system integration.
Service overview: Integration & interfaces (overview)
Review source code, name risks and costs, and evaluate options for continued care or modernization with effort.
1. Code access and tooling setup
We get secure access to source code, build scripts, and (where possible) data. We use static analysis, complexity, and security tools—matching the language (Delphi, VB6, COBOL, Java, .NET, …).
2. Analyze complexity, security, and dependencies
We assess code quality, complexity hotspots, security vulnerabilities, and dependencies on libraries or frameworks that are no longer maintained.
3. Interviews with business and development
We talk to the people maintaining or using the application to capture tacit knowledge. So it becomes clear where care is really hard—not only where 'the code looks weird'.
4. Report with options and effort
You receive a clear report for management and IT with options (continue care, modernize selectively, step-by-step rebuild), effort, and risks—as a decision basis.
Use our funding calculator to see which government grants may apply to your project.
Björn Groenewold – Managing Director
Service cluster
Related services for System integration interfaces: connect APIs, ERP & legacy
Quick orientation for APIs, system landscapes, ERP, Microsoft 365 and legacy – with separate entry points for interface and integration projects.
Related topics
Complementary services from other areas
These services are frequently requested together with Legacy Code Analysis or complement it thematically.
IT operations support: maintenance, monitoring & rescue
IT consulting strategy: roadmaps & digitalisation
From the field: Legacy-Code-Analyse & Due-Diligence. All references.
Use our interactive calculator for a first budget indication—free and non-binding.
Thorsten Frieling – Projektmanagement
A legacy code analysis turns assumptions into evidence about dependencies, security, testability and operational risk. It supports due diligence as well as a practical modernisation roadmap.
The output prioritises actions by business impact so teams can stabilise first and replace only where the evidence supports it.
Legacy Code Analysis is most effective when it is aligned with your business goals, existing systems, and team capabilities.
At Groenewold IT Solutions we combine product thinking, clear architecture, and hands-on delivery so that every project delivers measurable value. We address operational, compliance, and performance aspects early so that later releases stay on track.
Our approach to Legacy Code Analysis emphasises transparent backlogs, close collaboration with your stakeholders, and incremental delivery.
Whether you need a discovery workshop, an MVP, or a full-scale implementation, we define scope, effort, and success criteria up front. With over 250 completed projects we have the experience to recommend the right level of investment and the right next steps for your situation.
Explore our services overview for the full portfolio, our topic pages for in-depth articles linked to each service, and the IT Glossary for key terms.
For books and practical guides by Björn Groenewold, see publications. If you would like to discuss your project, we are happy to clarify scope, priorities, and a realistic timeline in a short consultation.
Our topic overview links related articles and entry points alongside this service page.
Recent articles from our blog that match this service.
Technical debt in legacy systems: A ticking time bomb?
In the fast-paced world of software development, time and budget are often the driving forces. In order to adhere to deadlines and keep projects within the framework, compromises are often made at...
Replace legacy software: strategies and common pitfalls
In today's fast-paced digital world, outdated software systems, often referred to as legacy software, are one of the biggest challenges for companies. You can find innovations frombrem...
Legacy Migration: Strategies for a smooth transition
In today's rapidly changing digital landscape, outdated IT systems, often referred to as legacy systems, represent a considerable challenge for many companies. Although she...
