Microsoft
Frontend Engineer • SDE 2/3
A round-by-round preparation track with direct links to lessons and practice problems. Microsoft tests breadth and depth equally — this guide prioritizes what gets asked most.
51
Total Topics
33
Ready to Study
4
Interview Rounds
75L–1.2Cr
Package Range
💡 Microsoft-Specific Tips
- • Microsoft values collaboration — think out loud, discuss trade-offs
- • Accessibility is non-negotiable — always mention ARIA, keyboard nav, screen readers
- • Be familiar with VS Code, Teams, Outlook — system design questions often reference these
- • Clean code matters more than clever code — use meaningful names, modular structure
- • Ask clarifying questions — they evaluate your thought process, not just the answer
Priority:Must Know (asked 80%+)Frequently Asked (40–60%)Good to Know
Round 1
60–75 min • 2 medium problemsDSA & Problem Solving
Arrays, strings, hashmaps, and tree problems. Microsoft expects optimal solutions with clear complexity analysis.
💻Two Sum (HashMap pattern)
Must Know→
💻Maximum Subarray (Kadane's)
Must Know→
💻Best Time to Buy & Sell Stock
Must Know→
💻Contains Duplicate
Must Know→
💻Product of Array Except Self
Must Know→
📖Arrays – Theory & Patterns
Must Know→
💻Container with Most Water
Frequently Askedsoon
💻Merge Intervals
Frequently Askedsoon
💻Valid Parentheses (Stack)
Frequently Askedsoon
💻BFS/DFS on Trees
Good to Knowsoon
💻Binary Search Variations
Good to Knowsoon
6/11 topics available • 6 must-know
Round 2
60–90 min • Build from scratchMachine Coding
Build a fully functional UI component. Microsoft looks for clean architecture, extensibility, and edge-case handling.
📖Machine Coding Fundamentals
Must Know→
💻Autocomplete / Typeahead
Must Knowsoon
🏢Split Pane / Resizable Panels
Microsoft-specificMust Knowsoon
💻Kanban Board with Drag & Drop
Must Knowsoon
💻Multi-step Form with Validation
Frequently Askedsoon
🏢Accessible Modal System
Microsoft-specificFrequently Askedsoon
💻Infinite Scroll with Virtualization
Frequently Askedsoon
🏢Keyboard-navigable Dropdown
Microsoft-specificGood to Knowsoon
1/8 topics available • 4 must-know
Round 3
60 min • Conceptual + CodeUI Technology Deep Dive
JavaScript internals, browser APIs, and React under the hood. They expect you to explain WHY, not just how.
📖JavaScript Runtime & Event Loop
Must Know→
📖Closures & Scope Chain
Must Know→
📖Execution Context & Hoisting
Must Know→
📖Prototypes & Inheritance
Must Know→
📖Promises & Async/Await
Must Know→
📖Polyfills (bind, Promise.all, etc.)
Must Know→
📖call, apply, bind
Must Know→
📖Currying & Partial Application
Frequently Asked→
📖Shallow & Deep Copy
Frequently Asked→
📖Service Workers & Caching
Frequently Asked→
📖LCP & Core Web Vitals
Frequently Asked→
🏢Accessibility (ARIA, Keyboard Nav)
Microsoft-specificMust Know→
📖React Reconciliation & Diffing
Frequently Asked→
📖React Fiber Architecture
Frequently Asked→
📖Custom Hooks Patterns
Frequently Asked→
📖Error Boundaries & Suspense
Good to Know→
📖Code Splitting & Tree Shaking
Good to Know→
17/17 topics available • 8 must-know
Round 4
45–60 min • WhiteboardFrontend System Design
Architect large-scale frontend systems. Expect questions around Microsoft products — Teams, Outlook, VS Code.
📖System Design Interview Formats
Must Know→
📖Client-Server Interaction Patterns
Must Know→
🏢Autocomplete with Caching & Debounce
Microsoft-specificMust Knowsoon
🏢Real-time Collaborative Editor (OT/CRDT)
Microsoft-specificMust Knowsoon
🏢Design Microsoft Teams Chat
Microsoft-specificMust Knowsoon
💻Design Notification System
Frequently Askedsoon
💻Design Image Gallery with CDN
Frequently Askedsoon
📖Micro-frontend Architecture
Good to Knowsoon
2/8 topics available • 5 must-know
Bonus
Behavioural Preparation
Prepare STAR-format answers for behavioural themes commonly asked at Microsoft.
See How Others Cracked It
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