A breakdown of my recent 3-round interview process at Mircosoft for SDE II. The focus was heavily on Low-Level Design (LLD) and the reasoning behind architectural choices.

YOE : Almost 5 years.

Round 1: DSA (60 min) - Feb 27, 2026

Problem: Meeting Rooms II (Finding the minimum rooms required) - https://leetcode.com/problems/meeting-rooms-ii/description/.

Discussion: We explored three approaches: Priority Queue, Two-Pointer, and an Array-based solution (for specific time ranges). I was asked to implement both the PQ and Two-Pointer versions.

Round 2: System Design/LLD (75 min) - Feb 27, 2026

Task: Design a Multi-floor Parking Lot.

Focus: After a project deep-dive, we spent the bulk of the time on the implementation details and class structures.

Round 3: System Design/LLD (60 min) - March 02, 2026

Task: Design an Undo/Redo mechanism for a text editor with configurable limits.

Focus: Heavy emphasis on choosing the right data structures to handle history efficiently.

• Key Takeaway: The design rounds weren't just about diagrams; they were about the "why" behind DSA choices and actual code implementation.

Currently waiting for the results.