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Hej, I'm CJ.

Empathic leader and technologist at heart.

Annual review and goal setting

I have been experimenting with various approaches to personal growth and goal setting, trying to make it lean and effective. This article describes how I am currently doing it, and includes my goals for 2024.

Is 100% code coverage better than 80%?

The art of writing tests is not straightforward, and writing good tests is even harder. Check out this post to learn how you can verify if your tests are doing what they are supposed to. And if you want to know what Ninja Turtles, X-Men and effective tests have in common.

Migrating a promotions engine

This article describes in depth how we managed to replace one of the most critical components of our checkout experience, with zero downtime. It was a large-scale migration involving approximately 30 teams and 500 active users.