Paynearby Technologies Technical Support Engineer Interview Questions and Answers for Experienced

Q1. About thread safety and synchronisation
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Q1. Find edge score of the nodes in a directed graph
Ans. 
Edge score of nodes in a directed graph
• Edge score is a measure of the importance of a node in a graph

• It is calculated by counting the number of edges that point to or from a node

• Nodes with higher edge scores are considered more important

• Edge score can be calculated using algorithms like PageRank or HITS
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Q1. Rotten oranges after every second in 2D matrix
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Simulate rotting of oranges in a 2D matrix every second.
• Create a queue to store the coordinates of fresh oranges

• Iterate through the matrix and add the coordinates of fresh oranges to the queue

• Simulate the rotting process by iterating through the queue and rotting adjacent fresh oranges

• Keep track of the time taken for all oranges to rot

• Return -1 if there are any fresh oranges left after the simulation
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Q2. Java and Spring concepts, HTTP, HTTPS, OSI layers
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Q3. DB design for air ticket booking system
Ans. 
DB design for air ticket booking system
• Create tables for flights, passengers, bookings, and payments

• Use foreign keys to establish relationships between tables

• Include fields for flight details, passenger information, and payment details

• Consider implementing a caching mechanism for frequently accessed data
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Technical MCQs (OS, CN, etc.), 2 coding questions (medium level)

Q1. Leetcode - Rainwater Harvesting
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Q2. Leetcode - Array/String
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Q1. HR + Resume Review (Technical)
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Q2. Explain Projects/Experience
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In round 1 we could only use Java

Q1. Interviewers are very friendly. Mostly the questions were based on SQL, dsa
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Basic DSA and android questions

Live coding round for android

Q1. Explain your past experiences?
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Q1. Explain Concurrency
Ans. 
Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run concurrently, improving performance and efficiency.

• Concurrency can be achieved through multithreading or multiprocessing.

• Example: A web server handling multiple requests simultaneously using multithreading.
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Q2. Explain Acid principles
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ACID principles are a set of properties that guarantee database transactions are processed reliably.
• Atomicity: Transactions are all or nothing. If one part of the transaction fails, the entire transaction is rolled back.

• Consistency: Transactions bring the database from one valid state to another. All constraints are satisfied.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once...read more
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Q1. 3 sum problem and number of operations required to make 2 strings same
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3 sum problem involves finding 3 numbers in an array that add up to a target sum. Number of operations to make 2 strings same involves finding the minimum number of operations (insert, delete, replace) needed to transform one string into another.
• For 3 sum problem, use a hashmap to store complements of each number and check if the complement exists in the hashmap while iterating through the array.

• For number of operation...read more
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Q1. Nearby app machine coding
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Q1. Project and practices followed and hld for inshort
Ans. 
I have experience working on projects using high-level design (HLD) practices.
• Utilized UML diagrams to create HLD for projects

• Followed industry best practices for software design

• Collaborated with team members to ensure HLD aligns with project goals
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Q1. Types of REST API methods?
Ans. 
Types of REST API methods include GET, POST, PUT, DELETE, PATCH, and more.
• GET - Retrieve data from a server

• POST - Create new data on a server

• PUT - Update existing data on a server

• DELETE - Remove data from a server

• PATCH - Partially update data on a server
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