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Frontend interview guide

Microsoft

VS Code, Teams, Azure Portal, Office web. One of the broadest frontend footprints in the industry.

Frontend engineers interviewing at Microsoft — product orgs vary (VS Code, Teams, Office, Azure) and the loop is adjusted accordingly, but the shape is consistent.

Last reviewed 2026-10-04

What they emphasise

  • Breadth and depth — DOM fundamentals, data structures, and system design all live in the loop.
  • Fluent UI awareness — the design system most Microsoft web surfaces are built on.
  • Accessibility seriously — WCAG is not optional in a Microsoft product.
  • Growth mindset in the behavioural round — the Satya-era culture is explicit about it.

The loop, round by round

5 rounds. Durations and formats are typical, not guaranteed — confirm the loop shape with your recruiter in the screen.

  1. Round 1

    Recruiter screen

    ~30 minPhone or video

    What it covers

    • Resume walk-through, level and team alignment.
    • Logistics — location, visa, timing.

    What they're looking for

    • A clear, specific "why Microsoft, why this org" — vary your answer by which org (Teams vs VS Code vs Azure Portal are different cultures).

  2. Round 2

    Technical phone screen

    45–60 minLive coding, usually in a shared editor

    What it covers

    • One or two JS/TS problems — one algorithmic, one practical (debounce, deep-clone, event emitter) depending on the team.
    • A short follow-up — complexity analysis, variants.

    What they're looking for

    • Clean working code and complexity analysis in the same breath — not one or the other.
    • Comfort explaining trade-offs under follow-up questions.

  3. Round 3

    Onsite: coding (two rounds)

    45–60 min eachLive coding across two interviewers

    What it covers

    • One round tends to be algorithmic (data structures and complexity) — trees, hash maps, sliding window, heap.
    • One round is UI-flavoured — build a small interactive component, usually from a described brief.

    What they're looking for

    • Correctness and clarity. Working code the interviewer can read beats clever code they have to parse.
    • In the UI round: a visible accessibility pass (keyboard, ARIA, focus) is often what separates offers from no-offers.

  4. Round 4

    Onsite: system design

    60 minWhiteboard / shared doc

    What it covers

    • A frontend-system prompt grounded in the team's domain — a browser code editor for a VS Code team, a chat UI for Teams, an operations dashboard for Azure Portal.
    • Scale, performance, extensibility, and the real security model.

    What they're looking for

    • Clarifying questions before diagrams.
    • A real position on extension/plugin models (if relevant) — Microsoft is one of the few places where plugin security is treated as architecture.

  5. Round 5

    Onsite: 'as appropriate' / behavioural (hiring manager)

    45–60 minConversation

    What it covers

    • Growth-mindset-shaped stories — learning from feedback, pivoting, admitting a wrong call.
    • Cross-team collaboration, ambiguity, navigating conflict.

    What they're looking for

    • A specific, well-formed 'I was wrong, I learned, I changed' story.
    • Humility paired with evidence — Microsoft's culture is explicit that confidence without curiosity is a red flag.

What each level expects

The bar you're being measured against — plus the failure modes candidates most often trip on at that level.

SDE 2 / mid

~2–4 years

Owns features end to end on an established team.

What they expect

  • Solid TS/React (or whatever framework the org uses — VS Code is React-based, Teams uses Fluent UI React).
  • Can produce accessible markup without having to be reminded.
  • Communicates in writing well enough to review a PR and leave useful comments.

Common failure modes

  • Accessibility ignored until the interviewer asks — in a Microsoft loop, that is often too late.
  • Framing growth-mindset answers as abstract talking points — specifics beat clichés.

Senior

~5–8 years

Owns a technical area, mentors ICs, influences patterns on the team.

What they expect

  • A system-design round that treats security, extensibility and performance as co-equal concerns.
  • Behavioural stories at the level of 'I led a cross-team initiative, here is the measurable outcome'.

Common failure modes

  • A system design that is clearly "my favourite pattern" rather than one adapted to the specific prompt.
  • In growth-mindset rounds, no 'what I would do differently now' — a strong story names the gap.

Principal

~8+ years

Technical direction for an area, shapes multiple teams' work.

What they expect

  • A system-design round that reads as a peer discussion with the interviewer.
  • Behavioural answers rooted in multi-team, multi-quarter outcomes.
  • Visible writing / public artefacts — specs, RFCs, talks.

Common failure modes

  • Showing up as a Senior+. The Principal bar is about influence across teams, not individual output.
  • No single area of deep technical opinion — Principal candidates are expected to be opinionated about something, not neutral about everything.

How to crack it

Day-of advice. The specific moves that separate offers from no-offers when the content is already in your head.

  1. 1Study Fluent UI (React or Web Components) at least enough to recognise the primitives. Microsoft web surfaces lean on it heavily.
  2. 2Prepare one component build in the VS Code / Teams / Azure Portal style depending on the team — a tabs component with keyboard nav, a tree view, a filtered list.
  3. 3Review the WCAG 2.2 keyboard-nav and focus-management sections. These come up more often in Microsoft loops than almost anywhere else.
  4. 4Pre-write three growth-mindset stories — a time you learned from a mistake, a time you changed your mind on a technical opinion, a time you took on something uncomfortable.
  5. 5If you're interviewing at VS Code specifically, read Monaco's architecture docs. For Teams, read the Fluent UI documentation. The specificity shows.

How to master it (over months, not days)

The longer-horizon work. These are the habits that pay off at Senior+ bars where cramming visibly fails.

  • Build and ship one real accessible component — not a demo. Have it audited by a screen reader user if you can. The depth you build this way is unmatched by study.
  • Learn the DOM at a lower level than you probably need. The Microsoft loop rewards knowing why `innerText` and `textContent` differ, how MutationObserver works, when IntersectionObserver is the right tool.
  • Pick one Microsoft open-source project and contribute to it over months — VS Code, TypeScript, FluentUI. The experience of a merged PR tells you more about the culture than any guide.
  • Make writing a habit — RFCs, blog posts, long-form PRs. The Principal path at Microsoft is heavy on written artefacts.
  • Read Microsoft's engineering blog and the VS Code Insider release notes. Pattern-match on how they discuss trade-offs.

Resources

On-site content for the technical prep, plus short-list of external links worth your time.

A note on sources. This guide synthesises public engineering blogs, published job descriptions, widely cited level frameworks, and public interview reports. Nothing here is insider knowledge or NDA-sensitive. Loops evolve — confirm the current shape with your recruiter.

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