Phone interview followed by a take-home assignment.

My interview was rescheduled thrice before I had a quick call discussing my current work, job expectations, and interview timeline, as well as a thorough briefing on Thumbtack's future engineering work.

The assignment was an interesting challenge to work on. Like most other reviewers, I wrote a simple in-memory database solution. I submitted my code a week after opening the challenge (you get two weeks) after extensive testing. I got an email back not long after saying they were going with other candidates.

They might be looking for more experienced professionals.

In-memory database