First, there was an online group meeting with a Kahoot quiz (basic technical questions). Then, I was invited for a 1-hour interview. The first part was more business-like, while the second part was a technical talk with two software engineers.

A lot about concurrency in Java (concurrency in Collections, threads, ways of synchronization, etc.).

Examples of concurrent sorting algorithms.

Relational Databases - levels of isolation.

Questions about Mockito/Spring/JUnit annotations (shown in an example code snippet).

I had to describe a solution for a task where there were two very large files (that wouldn't fit into operating memory) and there was a need to perform some kind of operations on them, which would result in the creation of a third file containing the outcome.