Horizontal Integration Software Engineer Interview Questions and Answers

45 min of mcq question on java and reasoning and aptitude.

Q1. All question from java spring boot, microservices and rest api along with some basic design of database.
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Q1. DSA Questions on array/linkedlist
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Q2. Spring Boot, Java OOPs,
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Senior Engineer from the team which is hiring you and an HR will join and you are given array, string and hashmap leetcode easy question and then some dbms queries to write. Once you solve that, engineer will ask tech related questions from your resume to see your understanding about those tech.

Q1. Design a multi tenant logging system
Ans. 
A multi-tenant logging system captures logs from multiple clients while ensuring data isolation and security.
• Use a centralized logging service (e.g., ELK stack) to aggregate logs from different tenants.

• Implement tenant identification in log entries (e.g., using tenant IDs or namespaces).

• Ensure data isolation by using separate indices or databases for each tenant in the logging system.

• Provide role-based access control (...read more
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Q2. DSA 3 - sum problem
Ans. 
The sum problem involves finding combinations of numbers that add up to a target value.
• Identify the target sum and the array of numbers.

• Use techniques like recursion, backtracking, or dynamic programming.

• Example: Given [2, 3, 5] and target 8, combinations are [3, 5] and [2, 3, 3].

• Consider edge cases like empty arrays or negative numbers.
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Q3. What is event loop?
Ans. 
The event loop is a programming construct that manages asynchronous operations in environments like JavaScript.
• The event loop allows non-blocking I/O operations, enabling efficient handling of multiple tasks.

• It works by continuously checking the call stack and the message queue.

• When the call stack is empty, the event loop pushes the first message from the queue to the stack for execution.

• Example: In JavaScript, setTime...read more
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Q4. Difference between cluster and worker threads
Ans. 
Cluster threads manage multiple processes, while worker threads execute tasks within a single process.
• Cluster threads are used in distributed systems to manage multiple nodes.

• Worker threads operate within a single application, handling tasks concurrently.

• Example of cluster threads: Node.js cluster module for scaling applications.

• Example of worker threads: Java's ExecutorService for managing thread pools.
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Q5. Why node js is single threaded
Ans. 
Node.js is single-threaded to handle asynchronous operations efficiently, using an event-driven architecture for scalability.
• Node.js uses a single-threaded event loop to manage multiple connections concurrently.

• This design allows Node.js to handle I/O operations without blocking the main thread.

• For example, while waiting for a database query, Node.js can process other requests.

• Single-threading simplifies the programmin...read more
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Q1. HashCode and equals method difference
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Q2. Project discussion
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Two coding questions and 8 MCQ's related to databases and springboot technologies.

Q1. Given arrays related problem to solve and some technical questions based on java springboot and mySql
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Q1. Discussed about the topics of threads and some other technical questions
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Q2. Asked to solve the question related to Linked List.
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Q1. Technical questions on node js
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Q2. Coding round which had 2 questions
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Basic aptitude questions were asked by interviewer, the way of communication of interviewer was pretty cool. overall good experience throughout the interview process.

Oops concepts, basic dbms questions, cloud computing questions etc