Services

Replacing the irreplaceable — during live operation

At some point, the system your business runs on becomes a risk: the original developers are no longer in the company, the documentation describes a state from ten years ago, and every change carries the danger of breaking something unforeseen. Switching off is not an option, but neither is the status quo: security gaps stay open, specialists for outdated technologies become rare, and every new requirement takes longer and costs more. We modernize such systems where it is hardest: during live operation, without interrupting your business.

What you get

  • Step-by-step migration instead of big bang: We break the modernization into manageable stages and run the old and new systems in parallel until every building block has proven itself in live operation. Your day-to-day business keeps running. There is no cut-off date on which everything has to work.

  • Systematic knowledge preservation: The most valuable asset of a legacy system is the business rules that have grown into it over decades, often documented nowhere but the code itself. We extract this domain knowledge systematically, AI-assisted through automated code analysis, and transfer it traceably into the new system.

  • Risk minimization as a method: Every stage has defined acceptance criteria, comparison tests against the legacy system and a proven way back. You stay in control in every phase and keep the option to adapt the pace to your business.

  • An architecture with a future: The result is not a "new legacy system" but a maintainable, testable and documented platform that your team or ours can develop again at pace, including the foundations for later AI integration.

  • Security and compliance along the way: Outdated systems are often the biggest weakness in a security audit. We bring authentication, encryption, logging and data protection (GDPR) up to today’s standard, following the same ISMS processes (TISAX) we use for the automotive industry.

  • Clarity before the decision: Not every system needs a rebuild. In the assessment we honestly evaluate whether refurbishment, gradual conversion or new development is the most economical path, with a reliable effort estimate instead of a rule of thumb.

How we proceed

  1. Analysis: Automated, AI-assisted survey of the code base, data flows and dependencies, even where documentation is missing.

  2. Strategy: A migration roadmap with stages, priorities and a parallel-operation concept, aligned with your business-critical dates.

  3. Implementation: Stage-by-stage migration with comparison tests, continuous acceptance by your business units and a way back at any time.

  4. Operations: After the replacement we take on long-term responsibility on request: operation, maintenance, further development.

What we build it with

We choose technologies by stability, security and future-readiness, not by hype cycle:

  • Backends & core systems: Established enterprise platforms such as .NET, complemented by systems languages where maximum efficiency is required.

  • Frontend: Modern single-page frameworks for fast, maintainable interfaces.

  • Data: Relational databases (SQL), time-series and NoSQL technologies, including migration of your existing data with verified completeness.

  • DevOps & continuous delivery: Automated build, test and deployment pipelines with mandatory code review: every stage traceable, every release reproducible.

Reference

We rebuilt a risk platform in energy trading (over €1bn in volume, business in more than 100 countries) completely during live operation. Without a single day of standstill.

How to start

Every collaboration starts with a free initial consultation. If needed, it is followed by a fixed-price assessment whose result stays yours.

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