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Kamil Mentel

Designer

When designing, I primarily focus on usability as I find people often get lost in poorly designed interfaces.

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Blog posts that I worked on

ux ui

Prototype Testing: How to Run Better Tests Before Building the Final Product

Prototype testing is not just a UX exercise. It is a risk reduction step in the product development process. It helps teams validate design decisions before weak assumptions turn into expensive technical problems. That matters because defects found in production can cost 60 to 100 times more than issues caught at the requirements or prototype […]

Jun 30, 2026 ・17 min read

ux ui

Stop Building Features Nobody Needs: Human-Centered Design That Actually Works

Human centered design is the fastest way to stop shipping „done” features that break in real work. Instead of debating opinions, you attach evidence to the backlog: who the users are, what they must achieve, and what fails under pressure. This guide shows the ISO-backed loop, the 5-day and 2-week playbooks, and the metrics that […]

Mar 31, 2026 ・20 min read