Software release during operation: This is how the change can be done without downtime

Software release in running operation: This allows change without downtime

*June 2026 *

In today's rapidly changing digital landscape, the modernization of software is no longer an option, but a necessity.

Outdated systems, often referred to as legacy software, can significantly limit the agility of a company, risk security and hinder the implementation of new technologies.

But the biggest challenge for many companies is to replace the Alte software without disturbing the running operation.

A stoppage of the systems, even for a short time, can lead to significant financial losses and reputational damage.

This article highlights the strategies and best practices for successful software release during operation.

Challenges in Resolving Legacy Software

Short: Executive answer: In today's rapidly changing digital landscape, the modernization of software is no longer an option, but a necessity.

Executive answer: In today's rapidly changing digital landscape, the modernization of software is no longer an option, but a necessity.

If Software release during operation: This is how the change can be done… is on your roadmap, View services und Discover solutions outline services and next steps.

The decision to replace an outdated software is often associated with a number of challenges. These range from technical barriers to organisational resistance.

Technical complexity

Short: Legacy systems have often grown for years or even decades and are deeply integrated into an enterprise's IT infrastructure.

Legacy systems have often grown for years or even decades and are deeply integrated into an enterprise's IT infrastructure.

They are often poorly documented and are based on outdated technologies for which there are few experts. This complexity makes it difficult to identify all dependencies and seamlessly integrate the new software.

Data migration

Short: Transfer of data from the old system to the new application is one of the most critical steps.

Transfer of data from the old system to the new application is one of the most critical steps.

Inconsistent data formats, missing data integrity and the sheer volume of data to be migrated can lead to considerable problems.

Careful planning and implementation of data migration is essential to avoid data loss or damage.

Resistance in the company

Short: Employees who have been working with the old software for years often face a sceptical change.

Employees who have been working with the old software for years often face a sceptical change.

The fear of the unknown, the effort for training and the concern that the new software could be more complicated are frequent reasons for resistance.

Open communication and early involvement of employees are therefore essential.

Strategies for successful software release

Short: Successful software release during operation requires careful planning and a step-by-step procedure.

Successful software release during operation requires careful planning and a step-by-step procedure.

Instead of a "Big Bang" approach, in which the entire system is changed at once, iterative methods have proven to be significantly more successful.

Step-by-step exchange (Strangler Fig Pattern)

Short: This method, named after the wortfeige, which slowly wraps and replaces a tree, provides for gradually replacing the old system with new components.

This method, named after the wortfeige, which slowly wraps and replaces a tree, provides for gradually replacing the old system with new components.

Individual functionalities of the old system are replaced by new microservices or modules. Data traffic is gradually becoming the new components u

References and further reading

Short: The following independent references complement the topics in this article:

The following independent references complement the topics in this article:

• Bitkom – German digital industry association
• German Federal Office for Information Security (BSI)
• European Commission – Digital strategy
• MDN Web Docs (Mozilla)
• W3C – World Wide Web Consortium

"AI in mid-sized companies works when processes are measurable and data is trustworthy—a pilot without a success metric is theatre."

— Björn Groenewold, Managing Director, Groenewold IT Solutions

Frequently Asked Questions (FAQ)

What is this article about: “Software release during operation: This is how the change can be done without downtime”?

Here we cover Software release during operation: This is how the change can be done without downtime — focused on architecture, process, and business outcomes.

In short: In today's rapidly changing digital landscape, the modernization of software is no longer an option, but a necessity. Outdated systems, often referred to as legacy software...

Who benefits most from the content described here?

Typical readers are business and IT leaders in Software development who want to secure quality, security, and maintainability over the long term.

How does this topic fit into an IT or digital strategy?

In a digital strategy, prioritize stable core processes first, then extensions. See also professional software development and consulting. For multi-system landscapes, IT consulting and architecture helps align vendors and internal teams.

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