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Legacy Modernization

Targeted, iterative renovation instead of endless patchwork fixes.
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Modernization Between Proven Methodology and AI Support

Legacy systems often hold critical business logic, but have grown technically and organizationally over the years. There are several strategies for modernizing them, ranging from rehosting and refactoring to rearchitecting or a complete rebuild. Which strategy makes sense depends on business goals, budget, regulatory requirements, and the technical state of the existing system.

AI agents are increasingly used in this process too, for example to analyze large amounts of legacy code or prepare refactorings. What they can’t replace are the underlying architecture and prioritization decisions, which remain a human responsibility. We offer the following formats covering different aspects of legacy modernization:

This page brings together articles, podcasts, talks, and case studies on legacy modernization.

iSAQB® Training

Evolution and Improvement of Software Architectures

Systematically improve software systems

Training

Cloud Migration
Training

Securing Legacy Software
Training

Technical Debt

Our Services

We advise honestly, think innovatively and love to build. The result: successful software solutions, infrastructures and business models.

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Blog Posts

Blog Post

Nebu: Self-made sovereignty

How I’m building an enterprise chat server with agentic development that simply doesn’t exist.

Philipp Beyerlein Senior Consultant
Blog Post

Where AI Helps (and Hurts) Across Different Coding Scenarios

My takeaways from Stanford University’s Developer Productivity Study

Markus Harrer Senior Consultant
Blog Post

Managing Geopolitical Risks with Enterprise Architecture

André Aulich Principal Consultant
Anja Kammer Senior Consultant
Blog Post

The Path to Heterogeneous Cloud Platforms

Philipp Beyerlein Senior Consultant
Blog Post

Modern Legacy (thanks to AI)

Why Focusing on Code Alone Falls Short in the Age of AI

Markus Harrer Senior Consultant
Blog Post

Software Analytics going crAIzy!

From analyzing problems in software systems to working solutions with AI

Markus Harrer Senior Consultant

News

Link

Software Modernization Strategies: 32 Approaches to Revitalize Your Legacy System
Link

André Aulich on Migrate P5 Archive Server to the Cloud
News

INNOQ Technology Night Berlin with Kevlin Henney on November 13

Talks

Talk
Talk

Agentic Software Modernization: Back to the Roots

VibeKode Berlin 2026 / 16:15 - 17:00

Talk
Talk

Continuous Architecture and Code Modernization With Team Habits and the 1% Method

iSAQB Software Architecture Gathering / 15:00 - 15:45

Talk
Talk

Getting to Know Your Legacy (System) with AI-Driven Software Archeology

WeAreDevelopers World Congress / 14:50 - 15:20

Case Studies

Case Study

DEVK: Standardizing Security and Compliance Across a Complex Software Landscape

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Case Study

Building a learning platform that enables continuous pedagogical evolution

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Popular Topics

Frequently asked questions

What do we mean by legacy modernization?

Legacy modernization refers to the process of updating and improving aging software systems. This is necessary to ensure the adaptability of running software to operational, regulatory and market challenges.

Why is modernizing legacy systems important?

By modernizing legacy systems, companies can increase their efficiency, minimize security risks and support future growth with the help of a flexible IT architecture.

How do you determine which legacy systems should be modernized?

The decision is based on a thorough assessment of the current IT landscape, prioritizing systems with high maintenance costs, security risks, or that impede business innovation.

What solution approaches are there for legacy modernization?

When modernizing a legacy system, rehosting, refactoring, rearchitecting, rebuilding and replacing are only some of the solution ideas. We make the decision dependent on business goals, budgets, regulatory requirements and technical challenges.

How does legacy modernization impact IT security?

Modern systems integrate current security standards and technologies that reduce the risk of data leaks and attacks while improving compliance.

How long does a legacy modernization typically take and can it be implemented without interrupting operations?

The duration of a legacy modernization varies depending on the scope and complexity of the project, typically ranging from a few months to several years. Iterative approaches often allow modernization “on the fly” without crippling day-to-day business. Key factors for duration include the size of the existing system, the chosen modernization strategy, and the potential need to introduce new technologies.