Mobikwik Lead Engineer Interview Questions and Answers

Leetcode medium and hard

zigzag traversal of BT
merge K sorted Linked List

Q1. Focussed mainly on Java, Spring and HLD
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Q1. LLD of booking system, designing a thread safe array blocking queue
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Q1. Normal salary discussion
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Q1. Find first non-repeating character in a string
Ans. 
Find the first non-repeating character in a string
• Create a hashmap to store the frequency of each character in the string

• Iterate through the string and check the frequency of each character

• Return the first character with frequency 1
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Q2. Implement stack in a way so that I will get min at any step in 0(1)
Ans. 
Use an additional stack to keep track of the minimum value at each step.
• Create a stack to store the actual values.

• Create another stack to store the minimum value at each step.

• When pushing a new value, compare it with the top of the minimum stack and push the smaller value.

• When popping a value, also pop from the minimum stack.

• To get the minimum value at any step, simply peek at the top of the minimum stack.
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Q1. Print even odd with different threads
Ans. 
Print even and odd numbers using different threads
• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure proper ordering of output

• Example: Thread 1 prints even numbers (2, 4, 6, ...) and Thread 2 prints odd numbers (1, 3, 5, ...)
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Q2. Executor service, java 8, spring boot
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Q1. Design LRU cache
Ans. 
LRU cache is a data structure that stores the most recently used items, discarding the least recently used items when full.
• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When an item is accessed, move it to the front of the linked list to mark it as the most recently used.
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Q2. Design flight booking system
Ans. 
Design a flight booking system for easy and efficient booking process.
• Allow users to search for flights based on destination, date, and number of passengers.

• Provide options for users to select preferred flight times, airlines, and seating preferences.

• Include secure payment processing for booking confirmation.

• Implement a user-friendly interface with clear instructions and easy navigation.

• Offer features like flight statu...read more
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Q1. What is the use of @LoadBalanced annotation
Ans. 
The @LoadBalanced annotation is used in Spring Cloud to indicate that a RestTemplate should be load balanced.
• Used to automatically distribute client requests across multiple instances of a service

• Helps in achieving high availability and scalability

• Works in conjunction with Ribbon load balancer in Spring Cloud
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Q2. You can use this annotation on top of RestTemplate Bean. By this annotation the instance that will be created is load balanced i.e you don't need to write code to make this RestTemplate bean load balanced.
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Q1. Describe your project and role
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Q2. You need to describe your project in detail like current technologies being used etc. and your roles and responsibilities
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Q1. Aap kaha kaam kiye hoo kitna year ka experience hai aapka
Ans. Sales team leader from Resilient innovation private limited
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Q2. Kitna year ka experience hai aapko
Ans. 5 year for sales team leader
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Q3. Aapki city konsi hai
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Q1. Aap freecharge ke bare me kya jante hoo
Ans. Freecharge ek maatra aise company hai jiska type axis Bank se hai
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Q2. Agar hamari company ka soundbox
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Asked string and array questions

Q1. Implementation of a blocking queue
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Q2. Multithreading concepts
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It was a system design round.

SQL and technical. Statistics.

Business case study. Problem solving

Q1. Past experience
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Q2. Reason to change
Ans. 
The reason to change can be due to evolving business needs, technological advancements, regulatory requirements, or competitive pressures.
• Evolving business needs: Changes in market trends, customer preferences, or strategic goals may necessitate a change in business processes.

• Technological advancements: Adoption of new technologies can improve efficiency, enhance customer experience, or enable new capabilities.

• Regulato...read more
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Q1. Reason for change
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Change is necessary to adapt to evolving business needs, technology advancements, and market trends.
• Change is essential for growth and innovation

• To stay competitive in the market

• To improve efficiency and productivity

• To meet customer demands and expectations

• To align with new technologies and industry standards
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Coding, stack and string

Q1. Java 8, collection, multithreading
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