The overall process included three interviews and a small programming assignment.

The process started with an initial phone interview with the hiring team, followed by a small programming assignment provided with specific application requirements to achieve.

The second interview involved a video call with members of the SRE team, focusing on SRE and software engineering discussions. The previously submitted assignment served as a focal point to discuss development decisions.

Finally, the third interview was also a video call, with different members of the SRE team. This interview focused on systems design and architecture processes, and included whiteboarding an example scenario.

You are building a real-time chat application. How would you design this?