Delhivery Interview Experience – 1 year of experience

Telephonic Interview due to COVID-19 

Round 1 : 

1. Merge Sort, internal functioning, its complexity. 
   
2. A SQL query was given, I need to find its result. 
   
3. Discussion about locks, synchronized blocks, deadlocks with different situations.
4. Asked about mutual exclusion, progress & bounded waiting
5. Discussion on 0-1 knapsack problem
6. A code snippet was given related to trees, need to tell what that code is doing.
7. Oops concepts: Abstract classes, Interfaces & the difference between them.
8. Asked for my Work Experience in the previous company & the project’s discussion.

Round 2: 

1. Started with a brief introduction & projects from resume
2. Difference between list and set.
3. Design LRU cache
4. Difference between Hashtable and HashMap
5. Discussed multi-threading concept(Asynchronous calls, Future, Concurrent Collections, Threads) – CountDownLatch
6. A programming question: https://www.geeksforgeeks.org/find-smallest-value-represented-sum-subset-given-array/

Round 3
Discussion on my past projects and work experience in the previous company. 

Round 4

1. Discussion on databases: 
   • Difference between ElasticSearch & other NoSql Databases. Why I have used ES in my project.
   • Can Redis be used as Database?
2. Java Concepts: Pass by reference.
3. Design a system, where you need to show each user a list of advertisements in a random fashion till the list is complete and then again show them in a different order than the earlier one shown.
4. Open-ended question: You are going to be stranded on an island and you are allowed to take just 1 bag, what all things will you take with yourself.

Verdict: Selected 

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