HR reach out, phone screen with hiring mgr, in-person 6-hour loop. The HR people were warm and welcoming. The phone-screen was straight forward and felt good. The in-person needs serious improvement. Several VERY junior people doing interviews with no apparent guidance or support (no one was shadowing to learn and no one shadowed to give feedback) and questions seemed unvetted.

The loop included the worst interview hour I've ever had in my career and I thought of aborting and leaving before lunch based on the low calibre and surreal nature of that person in that hour.

Design a system for an online reservation system.

Code an aggregation function for some time-series events.

Figure out where the error is in this system. Interviewer drew a schematic for a multi-part system and posed a problem related to errors seen in production and asked me to diagnose. Apparently this was something encountered by the team.

Implement an LRU cache. Assume Java.

After making we wait 15 minutes the interviewer asked a series of totally canned business-like questions that I found mind-numbing.