Systematic legacy app modernisation

Reduce effort and risk. Boost speed and future-proofing.

How much longer should your legacy software continue to hold back your growth?

Agile app modernisation: We transform your legacy applications (whether native, hybrid or outdated web tech) into modern, high-performance solutions. Technology-agnostic, AI-based and at a fixed price. Get in touch now!

Outdated existing systems tie up valuable resources and prevent you from responding flexibly to new market demands or AI trends. It is time to break free from technological shackles with a well-thought-out modernisation strategy and make your IT the driving force behind business success once again.

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Operations are becoming more expensive

Every year, the maintenance costs of outdated infrastructure and the search for specialists in obsolete programming languages rise. Studies show that almost two-thirds of all companies spend over €1.7 million annually on maintenance and updates for their legacy systems alone – and the trend is upwards.

Further development takes too long

Complex, organically grown legacy platforms turn every small change into a risk and unnecessarily prolong your release cycles. Those trapped in old tech stacks lose valuable ground to more agile competitors in the race for the fastest time-to-market.

Security vulnerabilities are on the rise

Outdated systems often no longer receive security updates, turning them into an unpredictable gateway for cyberattacks. Modernisation is not an option here, but a necessary safeguard for your compliance and business continuity.

76%

of companies state that outdated systems are blocking their AI innovations

We modernise your legacy systems using four key elements in a single methodology

  • Mature AI tools

    Our AI tools systematically analyse the code, architecture and documentation of applications to precisely extract the underlying business logic required for transformation. This results in a comprehensive, end-to-end analysis of entire application landscapes in a fraction of the usual time.

  • Software Engineering

    We bring 25 years of engineering experience to bear, transforming your legacy systems into clean, scalable and secure architectures. In doing so, we eliminate technical debt in a sustainable manner and focus on the best possible optimisation and functionality. At adesso, you will find experts in maintenance, rehosting and replatforming. We develop best practices through the integration of modern technologies such as AI-driven automation.

  • Domain expertise

    We understand your specific business processes and ensure that business-critical functions are preserved without error during the modernisation process. Our industry knowledge and adaptability guarantee the precise translation of your business logic into new technologies.

  • AI application

    Using the adSCAILE methodology and specialised AI agents, we automate modernisation projects and the testing of your applications. This ensures maximum implementation speed whilst maintaining high precision, thanks to experienced specialists involved in the process. adesso migrates outdated technologies to a new platform and ensures a rapid return on investment. Learn more

Modernisation of legacy software – with concentrated AI power

Modern app modernisation transforms outdated legacy applications into future-proof solutions – completely technology-agnostic and radically AI-driven. Regardless of whether your starting point is a native application or a hybrid framework, we bring proven business logic and processes into a new era using state-of-the-art AI agents.

Our structured approach begins with a precise assessment of the current state of all components and future functional requirements, followed by an in-depth analysis of the system context and all integration interfaces. Through detailed UX/UI, architecture and code reviews, we evaluate the optimal target platform – whether web, cross-platform or native.

The subsequent AI-based implementation (as a new build, modernisation or refactoring) is carried out at a transparent fixed price in scalable packages. In this way, we not only guarantee a fast time-to-market, but also long-term maintainability without incurring new technical debt, thanks to accompanying documentation, automated tests and other services. Find out more about the benefits of modernising legacy systems with adesso as your partner.

30–60% cost savings

Thanks to the targeted use of specialised AI agents and LLMs, we automate complex analysis and coding processes, drastically reducing manual effort. This enables us to achieve cost savings of up to 60% compared to conventional modernisation methods and bring your application up to date in record time. You invest less and benefit more quickly from a modern system landscape.

Concentrated expertise

At adesso, you benefit from a unique combination of over 25 years of proven software engineering excellence and six years of in-depth experience in applied artificial intelligence. This solid track record guarantees that we not only work with state-of-the-art AI tools, but also consistently adhere to proven engineering principles and the highest quality standards. Put your trust in a partner who understands the complexity of legacy systems and masters the tools of the future.

Cost-effectiveness redefined

Legacy system migration projects that were previously considered “impossible” due to cost and complexity are, for the first time, becoming truly cost-effective thanks to our agent-based approaches. We transform your technological burden into a strategic competitive advantage and make modernisations possible that would previously have failed on the business case. This allows you to safeguard the value of your business-critical logic whilst optimising resource allocation.

Fixed-price security

We put an end to the risk of unclear project costs by offering you full scalability from the outset through clearly defined fixed-price packages. This planning certainty prevents budget surprises and enables you to make reliable financial calculations for your entire strategy for modernising legacy systems. With adesso, you know exactly what results you can expect in relation to the price – secure, scalable and predictable.

Legacy migration with adesso

Your path to a modern application with our Agentic First approach

Structured, transparent and AI-accelerated – four clear steps to a new system:

Step 1

Current state analysis & discovery

We precisely map the current scope of functionality of your legacy applications as well as your future requirements for new features to create a comprehensive roadmap for your digital transformation. In doing so, we identify all relevant integration interfaces and the entire system context within the legacy code to ensure that no critical business processes are lost from the legacy system.

Step 2

Deep Dive Audit

Our specialised AI agents conduct an in-depth scan of the architecture and source code for technical debt and automated sources of error, creating a level of transparency that would be virtually impossible to achieve manually. At the same time, we assess the UI/UX quality to ensure that the modernised application not only runs stably but also delights your users.

Step 3

Strategy

Based on the data gathered, we determine the most efficient migration path – whether targeted refactoring or a strategic rebuild. We make this decision purely on the basis of data to guarantee the optimal balance between cost savings, time investment and long-term sustainability.

Step 4

Recommendation & Implementation

We define the ideal target technical platform and implement the modernisation highly efficiently using our proven adSCAILE methodology. In doing so, we combine the tremendous speed of agent-based AI with the in-depth experience of our senior engineers in a ‘human-in-the-loop’ process to ensure the highest code quality.

Start modernising your legacy applications now – with adesso as your strategic partner

Transform your legacy technology into a real competitive advantage before technical debt completely stifles your innovative capacity. With our combination of decades of engineering experience and pioneering agentic-first approaches, we prepare your application landscape for the AI era – efficiently, with low risk and at a guaranteed fixed price.

Our services by complexity

Lean Migration (Simple Applications)

Package S

Target group: Standalone apps or applications with minimal business logic

  • AI-supported code analysis and refactoring of a core platform
  • Capture of functional scope
  • UI/UX refresh
  • Technical migration to modern target architecture

Benefit: Fast time-to-market through agent-based standard templates

Business Transformation (Medium Complexity)

Package M

Target group: Apps with multiple integration interfaces and established business logic

  • Complete extraction of business processes via AI agents
  • Conversion into clean, new code
  • Analysis of the system context
  • Modernisation of interfaces (APIs)
  • Validation by human-in-the-loop experts

Advantage: 30–60% lower costs compared to a traditional rewrite, whilst ensuring full future-proofing

Enterprise Rebuild (Highly Complex Ecosystems)

Package L

Target group: Highly interconnected app landscapes with critical dependencies

  • Holistic agent-first approach
  • Complete rebuild or rearchitecting
  • Resolution of legacy blockers
  • End-to-end IoT connectivity with real-time data flow into backend systems
  • Integration with state-of-the-art cloud infrastructures

Benefit: Maximum scalability and security with drastically reduced migration risk

adSCAILE

Agent-based software development

adesso develops software throughout the entire lifecycle using AI agents. We have developed our own proven process for this purpose. adSCAILE opens up entirely new possibilities in software production. Scalable, compliant and proven.

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Any questions?

Ready to shed the digital baggage? Book your free initial assessment now and let’s work together to unlock the full potential of your applications.