How Microsoft interviews

1. The shape of a Microsoft loop

Microsoft's loop is the most relaxed of the top-tier loops. Four to five rounds, often spread over a day or split across two half-days. Decisions take a week or two, not a day. The pace is calmer than Meta or Amazon, but the bar is the same.

A standard senior IC loop:

Round 1   Coding / problem solving           (60 min)
Round 2   System design                      (60 min)
Round 3   Coding deep dive on a past project (60 min)
Round 4   "As Appropriate" — flex round      (60 min)
Round 5   Behavioral / culture fit            (60 min)

The "As Appropriate" round is unique to Microsoft. The interviewer chooses what to ask based on what the rest of the panel didn't cover. It might be another coding round. It might be a second system design. It might be a behavioral deep dive. The recruiter usually tells you the format the morning of.

2. What Microsoft grades you on

The Microsoft rubric splits into three big buckets that the panel discusses at the end of the loop:

The third bucket is the underrated one. Microsoft has shifted hard to cloud and SaaS, and the bar has shifted with it. Engineers who can frame design decisions in terms of "the customer needs this because…" score higher than those who frame them as "this is technically interesting because…"

3. What's different here

A few patterns specific to Microsoft:

• Multi-tenancy is the implicit constraint. Almost every Microsoft service serves multiple tenants — companies, organizations, schools. Every design conversation eventually lands on "how do we keep tenant A's data separate from tenant B's." Bring it up before they do.
• Identity is the second implicit constraint. Azure AD / Entra is the company's crown jewel. Even non-identity questions get asked through the lens of "how does this work with Azure AD for SSO?"
• Slower decision speed, but tighter writing. Microsoft engineers write a lot of design documents. Senior IC loops sometimes include a "send me a 2-page summary of what we discussed" follow-up by email. Don't be surprised if a system design round ends with the interviewer saying "and write up your decisions in a short doc."
• Reorg-aware design. Senior candidates are asked how their design accommodates the fact that the team owning it might split into two over time. Modularity beats cleverness.
• Less aggressive interview style. Microsoft interviewers don't push as hard as Meta or Amazon. This is a trap if you mistake it for low standards. The grade is the same; the delivery is gentler. The lack of pushback can lull weak candidates into a false sense of security.

4. The level bar

Microsoft levels for IC engineers:

• Level 59–60 (SDE). Entry. Almost no system design. Skip this course at this level.
• Level 61–62 (SDE II). One system design round, scoped tightly. Single deep dive sufficient.
• Level 63–64 (Senior SDE). Two system design rounds. Two deep dives expected per round. Multi-tenancy mentioned without prompting.
• Level 65–66 (Principal SDE). System design rounds shift toward platform-level reasoning. "How does this evolve over 3 years if we acquire another company?"
• Level 67+ (Partner SDE). Org-shaping conversations. Roadmaps, dependencies across teams, RFCs.

This chapter targets Level 63 (Senior SDE) by default. The deep-dive count and tradeoff articulation rise at 64+.

5. The Microsoft-flavored mistakes

6. The seven scenarios + take-home in this chapter

7. The next page

We open with Teams — the chat system Microsoft sells to nearly every enterprise. It's similar to Messenger from the [[messenger-1on1-group-read-receipts]] design, but with a multi-tenant overlay and channel-shaped scale instead of conversation-shaped.