Not a Unity employee, but I've placed candidates there and also talked to enough people post-screen to have a solid read on what happens in that first 30-minute call. Sharing because people keep asking.
First thing: Unity recruiter screens are not rubber stamps. The person on the other end has a calibration rubric and is actively assessing fit. Some screens I've heard debrief on were marked 'no proceed' without the candidate realizing it had gone sideways.
What they consistently cover:
Your motivation for Unity specifically. 'Why Unity' is almost always first or second. Vague answers about 'exciting space' don't land. They want to hear something grounded: a product you've shipped with Unity, a specific team or problem you've researched, a technical area you're excited about (multiplayer networking, DOTS, Editor extensibility, ad monetization, etc.). If you haven't used Unity or can't articulate a specific connection, that's something to prepare carefully.
Your current situation. Level, role, what you're working on. This is mostly listening, but they're mapping you to their open req. Be clear and specific about your actual scope; level inflation gets caught later and is awkward.
Salary expectations. Happens in most screens, sometimes early. Have a range ready. For senior SWE in 2026, the range I'm seeing is roughly $195k-$240k base depending on location and team, but confirm with current data points.
Timeline. They'll ask your availability for next steps. Be honest, especially if you have competing offers, because timeline management is something good recruiters can actually help with.
One pattern I'd flag: if the recruiter seems disengaged, that's information. The good signs are follow-up questions and genuine engagement on your background. Scripted-only, no-follow-up screens sometimes go no-further even with a strong candidate on paper.