TechHub Senior Sdet Engineer Interview Questions and Answers

Q1. 2 sum problem in different approach
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Q2. Maximum sub array sum
Ans. 
Find the maximum sum of a contiguous subarray within an array of integers.
• Use Kadane's algorithm to find the maximum subarray sum efficiently.

• Initialize two variables - maxEndingHere and maxSoFar.

• Iterate through the array and update the variables accordingly.

• Example: Input [1, -2, 3, 4, -1, 2, 1, -5, 4], Output: 10 (subarray [3, 4, -1, 2, 1])
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Q1. Design LLD for factory pattern
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Factory pattern is a creational design pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.
• Create an interface or abstract class to define the factory method

• Create concrete classes that implement the interface or extend the abstract class

• Factory class should have a method that returns an object of the interface type based on in
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It was online interview with video

Q1. Difference between string buffer and string builder
Ans. 
String buffer is synchronized and thread-safe, while string builder is not synchronized and faster.
• String buffer is synchronized, making it thread-safe for use in multi-threaded environments.

• String builder is not synchronized, making it faster but not thread-safe.

• String builder is preferred for single-threaded operations due to its faster performance.

• String buffer is used when thread safety is required, even though it
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Q2. What is hashmap
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HashMap is a data structure in Java that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap is part of the Java Collections framework.

• It uses hashing to store and retrieve elements quickly.

• Each key in a HashMap must be unique.

• HashMap allows for null keys and values.

• Example: HashMap map = new HashMap<>();
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Was asked to find a bug in code

Permutation probablity maths

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Q1. What is binary tree
Ans. 
A binary tree is a hierarchical data structure in which each node has at most two children.
• Consists of nodes connected by edges

• Each node can have at most two children

• The left child is smaller than the parent, and the right child is greater

• Used for efficient searching, sorting, and organizing data
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Q2. What is bst(binary search tree)
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A binary search tree (BST) is a data structure that organizes elements in a hierarchical manner, allowing for efficient searching, insertion, and deletion.
• BST is a type of binary tree where each node has at most two children.

• The left child of a node is always smaller than the node, and the right child is always greater.

• BST allows for efficient searching with a time complexity of O(log n) on average.

• Common operations on...read more
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Easy round with number

Q1. What is role inthe compay
Ans. 
As a Senior SDET Engineer, my role in the company is to design, develop, and maintain automated testing frameworks to ensure the quality of software products.
• Designing and implementing automated testing frameworks

• Developing test scripts and scenarios

• Collaborating with developers and QA teams to identify and fix software defects

• Participating in code reviews and providing feedback on testability

• Analyzing test results and
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Q2. Why shuld i hire uh
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30 questions aptitude

3 data structures questions

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Q2. Where would u see ur self in 5 years? What du tou except form us v
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