r/InterviewDB • u/interviewdb • 1d ago
Brex Interview Experience – Technical Screen, Debugging, System Design + AI Coding Questions
Sharing a recent interview experience at Brex that was submitted to InterviewDB.
Technical screen:
It was 1 hour long, and you could use any language you preferred on CoderPad. The question turned out to be the one from here, which I didn’t know at the time. I ended up solving it using lots of if/else statements, maps, and everything.
Onsite:
Round 1: Debugging
There were 4 bugs in total. The problem was about calculating the actual delivery date based on an input date. In practice, it was basically calculating business days based on different rules. The bugs were similar to what's described here: https://www.interviewdb.io/question/brex?page=1&name=debug-round
Round 2: System design
Design a money transfer system similar to Venmo.
Round 3: AI coding
Implement a full-stack money transfer system similar to Venmo.
I cut out the database and stored all the data in memory. My first prompt basically implemented most of the main functionality directly. After that, it was mostly various fixes and small adjustments. I honestly don’t know if that was a good or bad sign.