QBurst Technologies Lead Engineer Interview Questions and Answers for Experienced

Q1. Transaction in Spring Boot
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Transactions in Spring Boot help manage database operations as a single unit of work.
• Transactions ensure ACID properties (Atomicity, Consistency, Isolation, Durability) for database operations.

• Use @Transactional annotation to mark a method as transactional.

• Transactions can be managed programmatically using TransactionTemplate.

• Rollback can be triggered manually in case of exceptions.

• Spring Boot supports both declarative
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Q2. Java Array and problem solving
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Q1. What is hoisting in Javascript
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Hoisting is a behavior in JavaScript where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q2. What is function currying
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Function currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.
• Currying allows partial application of a function, where some of the arguments are fixed and the rest are left to be supplied later.

• It helps in creating reusable functions and improving code readability.

• Example: const add = (a) => (b) => a ...read more
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Q1. Basic of Oops and Garbage collection
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Q1. Code Review in c# and also with some network regarding questions
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Q1. Implement minstack
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Q2. How load balancers work
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Load balancers distribute incoming network traffic across multiple servers to ensure no single server is overwhelmed.
• Load balancers monitor the health of servers and distribute traffic based on predefined algorithms.

• They can be hardware-based or software-based.

• Common algorithms used by load balancers include round-robin, least connections, and IP hash.

• Load balancers can improve reliability and scalability of a website ...read more
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Q1. 2 sum problem to implement in O(n)
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The Two Sum problem involves finding two numbers in an array that add up to a target value.
• Iterate through the array and store the difference between the target and current element in a hashmap.

• Check if the current element exists in the hashmap, if yes, return the indices of the current element and the stored difference.

• Time complexity of O(n) can be achieved by using a hashmap to store elements and their indices.
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Q2. About the projects i have done
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Q1. Domain specific Questions
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Q2. NA NA NA NA NA, can't remember
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Q3. Can't remember the interview questions
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Q1. Core Domain specific Questions
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Q2. Can't remember the interview questions
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Q1. About me and experience
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Q2. Salary expectation and schedule of intervew
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Q1. About my experience and what I used to do
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Q2. Mainframe related questions
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Q3. Situation based questions
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Q4. How to handle and team dynamics
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Q1. Expectatations from me
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Expectations include strong analytical skills, communication abilities, domain knowledge, and leadership qualities.
• Demonstrate strong analytical skills to identify business needs and propose solutions

• Communicate effectively with stakeholders to gather requirements and provide updates

• Possess domain knowledge to understand industry trends and challenges

• Show leadership qualities by guiding team members and driving project
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Q2. My experience on the situations they handle day to day
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Q1. How the interview went
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Q2. How soon can I join
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Q3. Negotiation on the pay
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Most votes by a candidate given that people can give preference vote

Q1. Design Tagging System
Ans. 
Design a tagging system for organizing and categorizing data.
• Consider the types of data to be tagged (e.g. text, images, videos)

• Create a standardized set of tags and categories

• Allow for multiple tags to be assigned to each piece of data

• Implement a search function based on tags

• Consider implementing a hierarchy of tags for more complex categorization
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