Completed my Unity final round loop in March 2026. Sharing the actual structure because the 'what to expect' posts I found were mostly from 2021-2022 and things have changed.
Format: Fully remote. Five rounds across two days (you can request to split them). Each round is 55 minutes with 5 minutes of admin/transition.
Round breakdown: Coding (1 hour) - algorithmic, medium difficulty, similar to what you'd expect from the OA but harder. They timed me loosely, weren't strict about 'now stop', more interested in seeing how you think. System design (1 hour) - as described in other posts here: game-aware, drill-down heavy, expect to go two or three levels deep on any component you mention. Behavioral / leadership (1 hour) - senior IC so they were probing for influence without authority, decision-making under ambiguity, and a few retrospective questions about past projects. Technical depth / architecture (1 hour) - this one surprised me. It wasn't another system design, it was more of a technical conversation: 'given this existing design, what would you change and why.' They gave me a fictional but realistic architecture doc beforehand (sent the night before). You're expected to come in with thoughts. Don't skip reviewing it. Hiring manager round (55 min) - culture, team fit, questions for them. This felt lower-stakes but I later learned it's actually a real vote in the debrief, not just a formality.
Wait time after: 10 business days. Got the call from the recruiter, not the HM.
One thing I wish I'd done differently: prepped more on the 'read this doc beforehand' round. It's a genuine differentiator for senior-level hiring there.