The interview process was very nice. It took less than four weeks to complete.

The first three interviews happened remotely, including a screening, a behavioural interview, and a pair programming exercise.

The final interview at Slack's offices took five hours, consisting of four interviews with several team members. The Slack people were really nice; they were super kind and friendly. There were breaks between sessions, and I was offered snacks and drinks.

After a few days, I received an offer.

Think about a distributed system you have worked on and describe the main challenges/issues you have faced dealing with it.