Wissen Technology Interview Experience (On-Campus) 2022

• Job Title: Java Developer
• Job Location: Mumbai, Pune, Bangalore
• Eligibility: 7 CGPA and above (the company may shortlist)
• Eligible streams: COMP/IT

Round 1: Coding Round

• 10 MCQ-based questions on Space complexity, Time complexity, Basic Algorithm, and Pseudocode
• Coding Questions (Only the most optimal solutions were fully-accepted):
  • Count Pairs with a given sum in an array
  • One Class implementation Question, based on the integration (strictly to be coded in Java language).

Note- Resume Shortlisting was done after Coding Round 

Round 2: Technical Interview 1 (60 minutes)

• Concept of oops such as inheritance, polymorphism, abstraction, encapsulation and explain each one.
• Asked about my Project( which was based on Spring Boot) and asked me to code any API function introduced newly in Java8 (I coded Time-API ), https://www.geeksforgeeks.org/new-date-time-api-java8/.
• What are Joins and their types?
• What is Cache and its Levels?
• Difference between Aggregation and Composition?
• Coding Question:
  • https://www.geeksforgeeks.org/problems/merge-two-sorted-linked-lists/1
  • https://www.geeksforgeeks.org/write-a-c-function-to-print-the-middle-of-the-linked-list/
• What are the Keys in DBMS? Explain each.
• User-Level and Kernel-Level
• What are Threads? 
• Each Topic was asked in-depth.

Round 3: Technical Interview 2 (45 minutes)

• Do I have any offer in hand from some other company?
• Concepts of Operating systems include deadlock(prevention Algo), Paging, Semaphore, Mutual Exclusion, Critical Section, and Virtual Memory.
• Polymorphism, its types, and uses.
• Indexing in DBMS and its types.
  Coding question : 
  • Print all the elements which occur more than once, in the order given in an array.
  • https://www.geeksforgeeks.org/print-k-sum-paths-binary-tree/
• What is Normalization? Why it is needed? 
• Asked me about the city I was living in and some tourist places.
• Each Topic was asked in-depth. 

Round 4: Technical Interview3 + HR Round (30 minutes)

• Introduce yourself.
• Asked me about the city (Gurugram) where I did my Internship. 
• Can you relocate? Why not only Gurugram?
• What is your Favourite subject? What practicals have you done in that?
• Open Excel Sheet draw two tables (Student and Marks) and asked to perform various query manipulation related to Joins, UNION ALL, etc.
• Puzzle (Similar to)- https://www.geeksforgeeks.org/puzzle-measure-4l-using-given-3-buckets/
• Any Questions for me?

Final Verdict:  Got Selected