I recently interviewed with Expedia Group for a Software Engineer role and wanted to share my experience in case it helps others preparing!

📋 Process Overview

1. Online Assessment (HackerRank)
   A standard OA with a couple of DSA-based coding questions.
   Time complexity awareness and clean code mattered a lot here.

2. Round 1 – DSA
   Questions:

   • Longest Consecutive Sequence in an Array
     Solved using a HashSet for O(n) time.
     Follow-up discussion: time and space optimization.
   • Reorder Linked List
     Find middle → reverse second half → merge both halves.
     Follow-up discussion: edge cases and testing.
     The interviewer focused on clarity of approach and coding fluency.

3. Round 2 – DSA
   Questions:

   • Longest Substring with Distinct Characters
     Sliding window approach; emphasize maintaining indices and handling repeats.
   • Find Minimum in Rotated Sorted Array
     Modified binary search variant; explain invariants and edge cases (duplicates if present).
     What mattered most: explaining why the chosen data structure/algorithm is optimal and stepping through edge cases.

4. Round 3 – LLD (Low-Level Design)
   Design an API that determines whether a product can be delivered within 2 days, given a pincode.
   Key aspects discussed:

   • Core logic design (distance/time validation)
   • Data modeling
   • Extensibility for multiple regions or service levels
   • Handling API failures and scalability

5. Round 4 – Behavioural / HR
   Discussion around past work, challenges faced, and collaboration scenarios.
   They were looking for thoughtfulness and ownership more than anything else.

💡 Tips

• Brush up on array, linked list, sliding window, hashing, and binary-search patterns, these appeared in my rounds.
• Be ready to explain trade-offs clearly, especially in LLD discussions.
• Keep your communication crisp, Expedia’s interviewers value structured thinking.
• Don’t just code, narrate your reasoning as you go.