Without going into specifics due to an NDA contract, I will try to be as specific as possible to provide some useful feedback. I was interviewing for a senior engineer position (staff in their org chart).

Good experience overall. The work environment was friendly, and the office environment was modern and new. The engineers seemed competent and relatively experienced. The location is great, in the heart of Boston's Back Bay.

The phone interview was done through a third-party company called Karat. The experience there was rather rigid, and the interviewers provided no help most of the time. That was actually the hardest part of the whole interview process, as everything was so crunched on time, with the aim of you answering as many technical questions as possible.

Given two strings, find the longest common substring.

Given a list of domains, print out the total number of clicks under each parent.

Algorithm question: load packages into containers.

Design a system (system design + DB design).

Design a database schema for a specific use case (DB design).