I had one interview with a developer that included coding tasks and general questions. I interviewed for a position of a senior but left the interview thinking it was too easy. Questions about maps, slices, and some basics of concurrency.

Unless they are looking for a specific project, do not participate in a technical interview. I had 2 interviews for this company, twice they did not have a specific project in mind, just interviewing randomly. The first interview was one of the worst interviews in my life, the interviewer would ask some of the most weird and incredibly specific questions, after asking him if he ever used these he would say " I stumbled upon this a few weeks ago and wanted to see if you knew this ", bear in mind this is a senior developer with many years of experience. After 2 years I had another interview for this company, interview went awesome, answered basically all questions, (except again with a few very specific questions with again " I stumbled upon this a few weeks ago and wanted to see if you knew about it ", who does that ?). I was told I did not pass for senior but for middle ( bear in mind aside the very specific questions I answered everything, sometimes sluggish as I was stressed or misunderstood the question but still answered )."