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Microsoft Interview Experience
SDE-II
Process Overview
August 2025
Interview Rounds Breakdown
Online Assessment
90 mins
Data Structures
Algorithms
Combinatorics
The assessment was noted as being more difficult than the subsequent live interview rounds.
The candidate faced significant time pressure during the assessment.
The problems required a combination of graph traversal (Dijkstra/DFS) and advanced mathematical concepts (modular arithmetic).
Questions Asked
Dijkstra + DFS based problem
Graphs
Shortest Path
Solve
C(n,k) combinatorics with modular arithmetic
Math
Technical Round 1
60 mins
Data Structures
Algorithms
The round focused on fundamental data structure manipulation.
The candidate was asked to solve three distinct problems within the hour.
The interviewer prioritized standard algorithmic proficiency.
Questions Asked
Low Level Design Round 1
Low Level Design
Concurrency
The candidate was tasked with designing a Post Office system.
The interviewer heavily scrutinized the concurrency model, specifically how multiple delivery workers process letters in parallel.
The candidate successfully leveraged patterns from previous telemetry logger projects to handle the design constraints.
Questions Asked
Low Level Design Round 2
Low Level Design
The round focused on the classic Elevator system design.
The interviewer evaluated the candidate's ability to implement scheduling logic and handle multiple floor requests.
The design required clear communication protocols between the controller and individual elevator objects.
Questions Asked
Design an Elevator system.
Low Level Design
Applied Problem Solving
System Design
Performance Optimization
Real-time Systems
The round was multi-faceted, covering performance, distributed systems, and project deep-dives.
The candidate initially struggled with the CPU load problem but corrected the approach after interviewer guidance.
Key Takeaways & Advice
Candidate Advice
Interviewers prioritize the thought process over immediate correctness.
If redirected by an interviewer, remain calm and engage with the new direction rather than panicking.
Having actual code written for personal projects makes design rounds significantly more grounded and defensible.
Preparation Tips
Final Verdict
The candidate received an offer! 🎉
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Combinatorics
Solve
Rotten Oranges
Graphs
BFS
Solve
Validate Binary Search Tree
Trees
BST
Solve
Recover Binary Search Tree (Find two swapped nodes)
Trees
BST
Solve
Design a Post Office system with letter distribution and concurrency.
Low Level Design
Concurrency
Solve
The candidate demonstrated depth by discussing real-world implementation details of a Rate Limiter using the token bucket algorithm.
Questions Asked
Write code to optimize CPU load distribution across cores.
Performance
Systems
Design a real-time collaboration system like Google Docs.
System Design
Real-time
Deep dive into Rate Limiter implementation using token bucket.
System Design
Algorithms
Solve
Apply directly through the company careers portal rather than relying solely on referrals.
Build real-world projects from scratch to ground design discussions in practical experience.
Practice company-specific DSA problems.
Prepare for LLD by studying standard patterns like elevators, parking lots, and loggers.