Paynearby Technologies Technical Support Engineer Interview Questions and Answers

Q1. Normal java and sql question
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Q1. Sping boot and microservice
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You should be familiar with core java features. Collections, converting one collection Array / Vector to other. Removing duplicates. Lambda chaining / Functional programming. Basic SQL - Joins, Aggregates etc.

Q1. Explain Architecture of applications you worked on. Justify use of components. System Design questions.
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It was about DS Algo and Java garbage collection,multithreading

Q1. Low level design of rate limiter
Ans. 
Rate limiter is a system that controls the rate of traffic sent or received by a network interface.
• Implement a token bucket algorithm to track and limit the rate of requests

• Use a sliding window algorithm to track the number of requests within a specific time frame

• Consider using a distributed rate limiter for scalability and fault tolerance
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Q2. Springboot basics, java basics, future interfaces, basic sql queries
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A coding test based on data structure and Algorithms.

Q1. Question based on Projects in the resume
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Q2. Data Structure and Algorithms Object oriented programming Database management system Operating system
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The Question was average, the interviewer had a fixed approach in mind, which he wanted to follow, but was friendly and trying to help. Overall a good experience.

There was a Hackerearth test with two questions

Q1. Some standard data structures question on array
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Q2. Standard question on trees
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Q1. Snake and ladder lld
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Q2. Spring question on annotations
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Q1. Find k closest elements
Ans. 
Find k closest elements in an array
• Sort the array based on the absolute difference between each element and the target element

• Return the first k elements from the sorted array
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Q2. K Closest elements
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