Went through the Deloitte final round last quarter. Sharing because most posts I found were 3+ years old and the format has changed a bit.
Quick context: senior software engineer role, tech consulting practice, financial services client vertical. My loop had a live coding screen before this so by the final round they'd already seen me code.
The final round format (my experience) Two back-to-back interviews, each 45-50 minutes, on Zoom. One technical/design, one behavioral. There was also a third optional "culture fit" call that I think some practices add.
Technical/design interview The interviewer was a delivery lead, not a pure engineer. We spent maybe 20 minutes on a system design scenario (high-level, not whiteboard-deep), then moved into questions about a project I'd listed on my resume. They went deep on: how I made technical decisions under constraints, how I communicated architecture choices to non-technical stakeholders, how I handled a production issue.
No new coding problem. Just conversation about real work.
Behavioral interview This was with a principal. Full STAR format. Questions: Tell me about a time you had to push back on a client or stakeholder Describe a situation where you had to learn a new technology quickly on a project When have you had to manage a conflict within your team
The emphasis is on client-readiness. They're not just asking if you can code. They're asking if you can sit across from a CIO and handle pushback.
What I wish I'd known Go in with 4-5 strong STAR stories prepped. Not vague ones. Specific. With numbers where you can. And have a 30-second version and a 3-minute version of each. The principal cut me off at one point and asked me to give the summary version, which I wasn't ready for.
Timeline from final round to offer in my case was 11 business days. Which felt long but apparently is pretty normal for Deloitte.