Process Digitisation
Replace / Extend Your Legacy Software
Custom Software Development
In the world of business technology, there is a common and dangerous misconception: if the software is still running, it isn’t costing you anything. Many companies in Switzerland continue to rely on legacy applications—systems built decades ago on technologies like Delphi, Visual Basic, Access, or older .NET versions—simply because they fear the upfront cost of change.
However, the reality is that retaining these “grown” applications often costs significantly more in hidden efforts, technical debt, and operational risks than a targeted modernization would. Modernization is not merely an expense; it is a strategic investment in operational efficiency and the long-term viability of your digital infrastructure.
What Exactly is Legacy Software?
Legacy software refers to older applications that have grown organically over years or decades. While they often control production-critical processes—especially in the Swiss industrial sector—they are built on foundations that the modern tech world has left behind. These systems become “black boxes” where only a few veteran employees understand how the gears turn.
The Reality of Technical Debt
Technical debt represents the non-visible costs that accumulate when software is extended over decades without a fundamental overhaul. Imagine a system with 1.5 million lines of code (roughly equivalent to 41,000 A4 pages). In such an environment, a developer might require 450 hours of reading time just to understand the logic before they can safely make a single update.
Caption: Visible maintenance costs are just the tip of the iceberg; technical debt and opportunity costs lie beneath.
Breaking Down the Hidden Costs
Research into industrial software systems reveals startling figures regarding the true cost of maintenance:
- Onboarding Hurdles: New team members often require hundreds of hours to grasp complex, undocumented interfaces. In a modern environment, this takes days; in legacy systems, it takes months.
- Knowledge Silos & Dependency: When knowledge resides in the heads of a few individuals rather than in documentation, the business faces extreme risk. If a key developer retires, the “source of truth” for your production line leaves with them.
- Risk Surcharges: Hosting, security compliance, and cyber-insurance become increasingly expensive as the underlying technology ages. Outdated systems are harder to patch, making them prime targets for ransomware.
- Opportunity Costs: While competitors deploy new features weekly using agile methods, legacy systems suffer from long release cycles and frequent bugs. The cost of not innovating often outweighs the cost of the software itself.
The ROI of Modernization: A Model Calculation
Modernization, or re-engineering, does not mean discarding your existing business logic. Your company has spent decades refining processes; those workflows are valuable. Re-engineering involves lifting those proven processes onto a sustainable foundation.
Consider a model calculation for a system with a historical investment of 3.5 million CHF (approx. 23,000 working hours):
| Key Figure | Details |
|---|---|
| Historical Total Hours | ~23,000 hours |
| Productive Logic Share | ~30% (approx. 5,030 hours) |
| Efficiency Gains | 10–30% faster with modern tools |
| Additional Effort | +25% (PM, QA, Documentation) |
| Estimated Total Costs | ~1.2 to 1.8 million CHF (including security reserves) |
 | |
| Caption: Re-engineering allows you to preserve your business logic for roughly one-third of the original cost. | |
| This means you can replace a crumbling foundation for roughly one-third of the original investment, while significantly lowering the 15% annual “maintenance tax” typically required to keep legacy systems alive. |
Strategic Benefits Beyond the Price Tag
- Increased Delivery Speed: Modern CI/CD pipelines allow for daily updates rather than quarterly “big bang” releases.
- AI Readiness: AI requires structured access to data. Legacy systems often trap data in proprietary formats. Modernization unlocks this data, creating a foundation for machine learning and automated insights.
- Scalability: Modernized systems can leverage cloud elasticity, growing with your business without requiring massive hardware investments.
The “Step-by-Step” Replacement Strategy
The biggest mistake companies make is the “Big Bang” project—trying to replace everything at once. Expert modernization follows a controlled, staged approach:
- Analysis: Understanding the existing data structures and dependencies.
- Stabilization: Securing the current environment to prevent failures during transition.
- Modular Renewal: Replacing the system piece by piece so that business continuity is never broken.
Conclusion
Continuing to run outdated software is not a cost-saving measure; it is a gamble against stagnation. When maintenance and failures cost more annually than 15% of the original development value, it is time to act. In the Swiss industrial sector, the financial impact of a single hour of production downtime can exceed 100,000 CHF. To put that in perspective, the cost of just one hour of lost production is often equivalent to the budget for an entire month of dedicated modernization work.
By choosing a staged, modular replacement strategy, businesses can transform a growing cost block back into a manageable investment asset. Modernization is ultimately an investment in your company’s future competitiveness and its ability to innovate in an AI-driven world.
PROCESS DIGITISATION
