I applied online. The process took four weeks.

The process was largely fine with multiple stages and a lot of communication throughout until the end. It took four weeks, including two one-hour interviews back-to-back (stages 3 and 4), which requires a large time investment. I managed to get through all phases, and after many hours invested, I received an email saying, "We're going with other candidates." Though I passed the first two stages, clearly something in the final two wasn't good enough.

Design the architecture for a music app's real-time number of people listening to this song counter.