Dexcom Software Engineer Interview Guide

The recruiter reached out in mid-November and we had an initial conversation on the 20th. I was told to expect an update by end of week, but after sending follow-up emails over the next couple of weeks, I heard nothing for what felt like forever before finally getting a rejection email. The silence was really frustrating, honestly.

Before that dead end, though, I did go through multiple rounds. There were phone interviews with HR, the team lead, and the hiring manager, each probing different angles. The team lead asked me to walk through the most complex thing I'd designed, which required me to really articulate not just what I built but my specific role and the technical decisions I made. The hiring manager went deeper into my project history—how many I'd worked on, what I actually owned versus what I inherited, and crucially, how I handled getting stuck. One question that stood out was: what would you do if you could not solve a problem? It wasn't a trick question; they wanted to see if I'd give up, thrash blindly, or think strategically about debugging and escalation.

Then came the onsite, which was a full-day panel format with multiple interviewers. That's where they added an assessment or problem-solving quiz component. What surprised me most was that there was zero LeetCode-style algorithmic coding. Instead, the technical depth came from explaining concepts clearly—writing in the chat to define terms and walk through my thinking. Confidence mattered here; I learned pretty quickly that you had to be ready to drill down on any claim you made. They'd follow up with 'why did you choose that approach?' or 'what would you do differently now?' and you had to have a thoughtful answer, not just a surface-level one.

I ended up declining the offer that came through, but looking back, the process itself—when it was actually happening—was substantive. The communication breakdown at the very beginning was the real letdown.