Wingify Software Development Engineer II Interview Questions and Answers

Q1. How make a queue using a stack
Ans. 
To implement a queue using a stack, use two stacks and simulate the queue operations.
• Use two stacks, one for enqueue operation and one for dequeue operation.

• For enqueue operation, simply push elements onto the stack used for enqueueing.

• For dequeue operation, if the dequeue stack is empty, pop all elements from enqueue stack and push onto dequeue stack.

• Then pop from the dequeue stack to simulate dequeue operation.
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Q2. Create a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Initialize a head pointer to null

• Add nodes by updating next pointers

• Traverse the list by following next pointers
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Dsa problems dp and tress problem

Q1. Tell me about your self
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Q2. Projects and intership
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Q1. Tell me about
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Q2. Your self they are asking
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Q3. What is your weakness
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Q4. Any questions ask for me
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Q5. All the best future
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Coding for international

Coding exercise related to probability

Q1. Database design for ride hailing service like uber, ola
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Q2. Tech stack needed to build a real time application
Ans. 
Tech stack for real time applications includes WebSocket, Node.js, Redis, and MongoDB.
• Use WebSocket for real-time communication between client and server

• Node.js for server-side logic and handling multiple connections efficiently

• Redis for caching and storing real-time data

• MongoDB for persistent data storage and retrieval
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Quantitative arithmetic,verbal reasoning,non-verbal reasoning,etc

Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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Aptitude test was easy but difficult

Q1. Technical questions linked list
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Q2. Array binary search Dp
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Q1. RDBMS related questions asked
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Q2. SQL login building related questions
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