BOLD Technology Systems Sdet-I Interview Questions and Answers

Hackerrank - 3 questions 2 hrs

Hackerrank test with medium questions

Q1. Machine coding round to design a shopping cart
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3 Coding question, mix of easy medium and hard questions. Online proctored on Hackerrank

Q1. 1. A variation on 2 sum problem (based on number of digits) 2. Average of node value and its subtree (Count no of nodes where average of the subtree and the node itself equals to the node value). It was t...read more
Ans. 
2 sum problem variation based on number of digits and finding nodes where average of subtree and node value equals node value.
• For the 2 sum problem variation, use a hash table to store the digits and their indices.

• For the subtree problem, use a recursive function to traverse the tree and calculate the average.

• Examples: [1, 2, 3, 4, 5] with target 7 and tree with root 5, left child 4, right child 6, should return 2 and
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Q1. I was asked an LLD question about a system to manage and track cars and their maintenance. Also some questions based on run time polymorphism and SQL
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Q1. Discussion with the CTO. You get to explain about the work you did and some clarifying questions.
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Q1. Write a program on stack operations
Ans. 
A program for stack operations
• Create a stack using an array or linked list

• Implement push() and pop() functions

• Check for stack overflow and underflow

• Implement peek() function to view top element

• Example: stack.push(5), stack.pop(), stack.peek()
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Q1. Basic Java 2 coding questions
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Q2. Testing related scenario based questions
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Q1. 1 easy java question
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Q2. Work experience and project related questions.
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Q3. Frameworks related questions
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Q4. Scenario based Question
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Q1. Everything related to your resume
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Q2. Projects you've worked on in detail
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Q3. Behavioural Questions
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Round duration - 60 Minutes
Round difficulty - Medium

Timing was around 11 am
Environment was great, it intrigued me to join Blinkit.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Round duration - 60 Minutes
Round difficulty - Medium

Timing 11 am
Interviewer had good knowledge

Q1. Can you explain the activity lifecycle in Android development?
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Q2. Can you explain the fragment lifecycle in Android development?
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Q3. Can you explain the MVVM pattern?
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Round duration - 30 Minutes
Round difficulty - Easy

This round is cultural fit round

Q1. Design an Ordering system with multithreading
Ans. 
An ordering system with multithreading for efficient processing
• Use a queue data structure to store incoming orders

• Create multiple threads to process orders concurrently

• Implement synchronization mechanisms to prevent race conditions

• Consider using a thread pool to manage threads

• Use locks or semaphores to ensure thread safety
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Q1. Design a whatsapp like service
Ans. 
A messaging service with features like text, voice, video calls, group chats, and file sharing.
• Create a user-friendly interface for messaging and calling

• Implement end-to-end encryption for secure communication

• Allow users to create and join groups for group chats

• Enable file sharing for documents, images, and videos

• Provide options for voice and video calls with good quality

• Develop a notification system for new messages a
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Q1. General questions about my projects
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