The engineering logs of an independent builder.

I'm Micael. I spent years as an embedded software engineer in the automotive industry, writing safety-critical code where bugs could cost lives. That environment taught me to think differently about software. Every line matters, edge cases are not optional, and shipping broken code is not an acceptable risk, just look at the endless vehicle recalls.

Now, I apply that same rigor to building my own B2B/B2C tools. Invisible Puzzle is where I document the architecture, the mistakes, and my perspective from shipping software on my own into the world.

This is not another "10x productivity hack" blog. These are engineering logs from the trenches. Here you will find what worked, what failed, and what I learned building products people actually pay for. Without venture funding. Without a team. Just code, customers, and honest metrics.

Each tool here started as a problem I faced or saw others struggling with. MockClip exists because creating demo videos was expensive and slow. MindLock exists because AI chat history is a mess and you cannot trust it. PuzzlePad exists because Stream Decks are €150 and AutoHotkey requires endless configuration.

The pattern is simple. I find a specific problem, build a focused solution, charge money, and iterate based on feedback. Some tools will succeed. Some will fail. But all of them teach me something about building products that solve real problems.

If you are building your own tools, shipping side projects, or just curious about the technical decisions behind indie software, you are in the right place. I share the architecture decisions, the performance optimizations, the failed experiments, and the micro-decisions that nobody talks about, the ones that make or break every product.