Perfios Software Solutions Senior Software Development Engineer Interview Questions and Answers

Q1. Internal working of hashmap
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Q2. What are collections
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Q3. What are design Patterns explain singleton design pattern
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Q4. What annotations did you use in spring boot. how @transaction annotation works
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Q1. Asked 2 puzzles
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Q2. What is vertical scaling and horizontal scaling
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Q1. Salary Discussion
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Q1. SOLID Principles
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Good round moderate coding questions were asked

Q1. Coding question based on trees
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Q2. Coding question based on math/binary search
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Q1. Rate Limiter with possible test cases
Ans. 
Rate limiter is a mechanism to control the rate of requests sent to a server
• Implement a sliding window algorithm to track the number of requests within a specific time frame

• Set a limit on the number of requests allowed per unit of time

• Return an error response when the limit is exceeded

• Test cases: 1. Send requests below the limit - should be successful. 2. Send requests above the limit - should receive an error response
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Q1. Rank teams based on some criteria
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Q1. Job scheduler system design round
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Q1. Javascript question Diff b/w function declaration and expression, types of scope, Call,bind and apply,
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Q1. Lexical Scope and questions based on scope
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Quant and reasoning question

Two coding question 1 medium and 1 hard

Q1. Core java in depth and dsa question
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Q1. Hr rounds salary and company policy discussion
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I attended through campus placement.they gave a general topic and ask us to speak

Q1. What is variable html structure coding in array
Ans. 
A variable is a storage location in a computer program that holds data and can be referenced and manipulated.
• Variables are used to store data in a program and can be of different types such as integers, strings, or arrays.

• In HTML, variables are not directly used, but data can be stored in attributes or elements for manipulation.

• Coding in an array involves storing multiple values in a single variable, accessed by index
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Q1. It was just a simple general discussion about the timings
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45 min simple technical oops java based and aptitude

30 min coding test 1 question on dp

Q1. Dsa question + resume
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Q1. One dsa question
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