
Claus Villumsen
Contributor
I started my people management "career" when I became CTO of Bullguard Internet Security, which was mainly a development team based in Romania. The truth is, I didn't have anything but my common sense and determination to make good products that could guide me in my everyday people management. If I did well by "my guys", maybe it was blind, dumb luck. Sure, I read a couple of psychology and people management books, but I never found the recipe or how-to-guide to do right by people. I am not ashamed to brag about my most outstanding achievement in my professional life: "Making a shit load of people motivated to come to work."
19 articles by Claus Villumsen

Work
Productivity
Legacy modernization requires different instincts than greenfield development. These are the eleven habits that separate engineers who succeed at it from those who struggle.

Productivity
The build vs buy decision doesn't end when you ship. It continues every time you need to modernize what you built. Here is what happens when your custom system becomes your biggest constraint.

Work
Every digital transformation strategy eventually hits the same wall. The legacy system that cannot be modernized fast enough. Here is why that wall exists and what it actually takes to get through it.

Team Management
When an outsourced team hands over a system nobody fully understands, you have a legacy problem before the ink is dry. Here is how to take control of code you did not write.

Productivity
Legacy modernization is a deeply human problem. The systems we inherit were built by people with different assumptions and contexts. Understanding them requires the same diversity of perspective.

Work
We had a mountain of legacy HTML that needed to become structured Strapi CMS content. Manual conversion would have taken months. We built four AI agents to do it instead. Here is how they work.

Productivity
AI
Coinbase built a Ruby on Rails monolith that scaled to billions in transactions and then became a liability. The technical debt they accumulated took years to address. Here is what the faster path looks like.

Work
AI
Wise built a smart monolith. It worked perfectly until it did not. The five-year migration that followed was painful and expensive. Here is what a different approach could have looked like.

AI
Gartner published a clear message in 2025. Legacy applications cannot support AI capabilities without transformation. Here is what that actually means and how you close the gap without a big-bang rewrite.

AI

Legacy Modernization
AI

AI

AI

Legacy Modernization
AI

AI

AI
Legacy Modernization

Legacy Modernization
AI

AI
Legacy Modernization
A Norwegian vehicle leasing company. A 1998 Access database with VBA forms. Twenty-five Italian engineers with a plan I knew would fail. And me, saying yes before I understood what I was getting into. This is what happened next.

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