They give homework before the actual interview on the HackerRank platform. It consists of several easy theoretical questions and three programming problems.

The first two are also easy, but the last one took several hours to solve. The idea is quite obvious (Dijkstra's algorithm, distances between a given vertex and all the others), but there are a lot of details regarding input/output and error handling, so doing it all accurately takes quite a lot of time.

Based on my solution, they invited me for a behavioral interview with their HR. It was a typical conversation about experience, motivation, previous jobs, etc.

A week or two later, I got an email saying I didn't pass this interview. No specific feedback, just advice to "develop new skills and gain experience so that you can be successful in the interview process in the future."

I asked them what specific skills/experience I should develop, but they didn't respond. The whole process ended up being a waste of my time.

I wouldn't have complained if my "cultural misfit" had been revealed before I spent a lot of my time on their test. In general, I do not advise you to do these test assignments, especially if they require a significant amount of your time and this is the first stage of communication with the company. There is a chance that HR will simply not like you, and your time will be wasted.

Programming Homework:

Problem on Dijkstra's algorithm, finding the distance between a given pair of vertices. Additional condition: return an error if there are several shortest distances.

Behavioral Interview:

A typical conversation about experience, motivation, previous jobs, etc.