Wissen Technology Senior Software Engineer Interview Questions, Process, and Tips

Q1. Write a program to merge 2 sorted list with n+m complexity
Ans. 
Merge two sorted lists with n+m complexity
• Create a new list to store the merged result

• Iterate through both lists simultaneously and compare elements

• Add the smaller element to the new list and move to the next element in that list

• Continue until all elements from both lists are merged
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Q2. From the employee table find out the employee list whose salary is highest in the department
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Q3. Singleton design patterns
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Q4. What is dependency injection
Ans. 
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing a way to mock dependencies.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.
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Q5. N+1 problem of hibernate
Ans. 
The n+1 problem in Hibernate occurs when a query results in multiple individual queries being executed for each row fetched.
• Occurs when a query fetches a collection and then for each element in the collection, another query is executed to fetch related data

• Can be resolved by using fetch joins or batch fetching to reduce the number of queries

• Improves performance by reducing the number of database round trips
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The code is given to you and you have to solve it

Q1. You have to go F2F for the interview, you will be asked for programs
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Q2. And prepare sql questions
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Q1. It was not that good, panel only not able to elaborate the question
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Q2. Very disappointing, did not received the feedback also
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Medium to hard question

Q1. Core java and dsa algorithm
Ans. 
Core Java is a fundamental programming language used for developing software applications. DSA algorithms are essential for efficient problem-solving.
• Core Java is used for developing software applications and is based on the Java programming language.

• DSA algorithms are data structures and algorithms used for efficient problem-solving.

• Examples of DSA algorithms include sorting algorithms like Bubble Sort and searching a
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Q1. Core java and dsa problems
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Q1. Dsa problems and system design
Ans. 
DSA problems involve solving algorithmic challenges, while system design involves designing scalable and efficient software systems.
• Practice solving DSA problems on platforms like LeetCode, HackerRank, or CodeSignal.

• Study common data structures and algorithms like arrays, linked lists, trees, sorting algorithms, and searching algorithms.

• For system design, focus on scalability, reliability, performance, and maintainabil...read more
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Candle problem
Multiple choice questions
Non Repeating characters