In the first screening interview, we spoke entirely in English.

He asked me about my potential relocation to another country and about my years of experience as a developer, as well as how I had contributed lately. I told him a lot about that, but it didn't seem to be of much interest to him compared to what followed.

Then he proceeded to ask me technical questions, something I didn't expect from an HR person, and therefore, I hadn't prepared for it.

There was a final question about idempotency that I couldn't answer, and the next day, I was notified that I didn't get the position.

Worst time to get a value from a hashmap. And how it works.

What are Dispatchers in Kotlin?

Where would you place a mapper in a project's architecture?

This was passed to me in writing via chat: Can you explain how a mobile app should interact with a backend when performing operations that must be idempotent (e.g., sending a payment or submitting a form)? Please include how idempotency keys are generated, stored, and reused across retries.