Modernising legacy software
Many organisations rely on a platform, portal or operational system that has been developed in-house over recent years and still supports crucial processes. The software works, contains a wealth of process knowledge and is business-critical. At the same time, teams are finding that further development is becoming increasingly difficult: features that previously fit within a single sprint now take three to four sprints, the same errors keep recurring and new ambitions such as AI or additional integration are difficult to fit into the existing structure.
This shifts the question from pure maintenance to a strategic choice: is targeted refactoring still the best route, does the situation call for a software rebuild, or does a phased application modernisation better suit the scale and pace of the organisation?
DTT helps to clarify that choice based on the actual state of the codebase, and translates the outcome into a realistic modernisation programme with a well-defined scope and investment strategy.
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The benefits of this service
Clarity on the technical condition of your legacy software
An informed choice between refactoring and rebuilding the software
Control over risks, investments and development speed
A future-proof foundation for further growth
How we work
01
We assess the current technical foundation
Together with your team, we assess the quality of the codebase, the technical dependencies, maintainability and scalability. We specifically identify the areas where legacy software is slowing down innovation, increasing risks or requiring an unnecessary amount of development capacity. The result is an objective picture of the codebase and its impact on the team, free from assumptions.
02
We determine the best modernisation route
We then assess which route best suits the current situation and the organisation’s ambitions. This may result in targeted refactoring, a software rebuild, or a phased software modernisation in which continuity and innovation are carefully combined. Because DTT implements all three routes, our advice remains independent and tailored to what delivers the most value in your specific context.
03
We translate this into a concrete plan
We develop the outcome into a clear approach with scope, priorities, phasing and investment direction. This creates a path that is administratively justifiable and technically aligned with further development, integrations and growth.
Here's what to expect
An informed choice for the future of your software
An ageing codebase calls for a clear assessment of the next step. This service identifies where technical debt is truly holding things back, which limitations are currently being felt, and which approach delivers the most value in terms of continuity, development speed and future-proofing.
Refactoring when the existing foundation still supports further development
When the core architecture still makes sense and problems are concentrated in specific parts of the system, targeted refactoring often delivers the quickest value. We focus our approach on reducing technical debt, improving maintainability and increasing development speed, without unnecessarily disrupting existing processes.
Software rebuild when legacy software continues to hold things back
When features consistently require a significant amount of time, maintenance consumes a large portion of the team’s capacity, and new ambitions such as AI or new integrations are difficult to fit into the existing structure, software rebuild or application modernisation offers greater scope. A new foundation can be more compact, easier to maintain, and designed from the outset for scalability and further development, whilst retaining the process knowledge accumulated from the existing system.
Frequently asked questions
When should you opt to refactor an existing codebase?
Refactoring is often a good choice when the core architecture is still serviceable and the main issues lie in maintainability, complexity or local technical debt. It is particularly effective when targeted improvements provide sufficient scope to speed up development and reduce risks, and when continuity is a key consideration.
When is rebuilding software a smarter option than continuing to develop it?
Rebuilding software becomes a more viable option when legacy software systematically slows down development, limits scalability, or contains numerous dependencies that remain difficult to manage. Thanks to modern frameworks, better tooling and AI-assisted development, development times have become significantly shorter than they were a few years ago, making rebuilding a more realistic option than organisations might expect.
How do you determine whether legacy software is still fit for the future?
This starts with an understanding of code quality, maintenance overhead, dependencies, performance, and the extent to which new requirements can still be implemented. Compatibility with future growth, integrations and organisational processes also plays a key role in this assessment, alongside practical indicators such as feature development times and recurring errors.
What are the benefits of analysing an outdated codebase?
A thorough analysis highlights where the technical risks lie, how much development speed is being lost, and which modernisation approach is most suitable. This provides a solid basis for investment decisions and for determining how refactoring, a complete rebuild or phased software modernisation should be approached, including an initial overview of the scope and phasing.
Can application modernisation also be carried out in phases?
Yes. In many situations, a phased approach makes sense, for example when business continuity is a key consideration or systems are closely intertwined with other processes. In such cases, modernisation is implemented step by step, with clear priorities, a manageable scope and controlled risks for each phase.
Does DTT also assist with implementation following the analysis?
Yes. Based on the analysis, DTT advises on which approach — targeted refactoring, software rebuild or a combination — will deliver value most quickly. Your team can take on that advice internally, or we can take over the implementation in full or in part. This is suitable if your internal team wants to keep the focus on the product and users, if extra speed is needed in the process, or if you prefer to outsource part of the development capacity. We have experience with every approach and will help you choose the one that provides the most peace of mind and control in your situation.
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