5paisa Capital Ltd. DevOps Site Reliability Engineer Interview Questions and Answers

There was a take home coding test - application to allot a parking lot.

Q1. Questions around optimisations around parking lot application submitted in round1. Implement more use cases asked on the spot System Design/Scaling related questions
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Q1. Mine was java, so Java technical questions, Java new features Questions around Design patterns Questions on SOLID principles
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Q1. Use case was given for wallet(e.g. pay later wallet) and asked to design basic REST APIs. E.g. User have balance in wallet User makes transaction via the wallet User add money in wallet
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Q1. It was 1 hour round. This was round with Engineering Technical Head. The questions were around willingness to work, long term / short term goals, high level behavioural questions, cross questions to evalua...read more
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Q1. This was HR round, around 20 minutes
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Q1. How to build an caching layer for iOS Apps
Ans. 
Building a caching layer for iOS Apps
• Identify the data that needs to be cached

• Choose a caching mechanism (e.g., NSCache, CoreData, SQLite)

• Implement caching logic in the app's data access layer

• Define cache eviction policies to manage memory usage

• Consider using a cache expiration mechanism

• Handle cache invalidation when data changes

• Optimize cache performance by using appropriate data structures
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Q2. How to optimise image rendering for iOS Apps
Ans. 
Optimizing image rendering for iOS Apps involves techniques like image compression, caching, lazy loading, and using the appropriate image formats.
• Use image compression techniques like JPEG or PNG optimization to reduce file size without compromising quality

• Implement caching mechanisms to store and retrieve images locally, reducing network requests

• Utilize lazy loading to load images only when they are needed, improving...read more
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Q3. Tell me about framework types in iOS
Ans. 
There are several types of frameworks in iOS, including system frameworks, third-party frameworks, and custom frameworks.
• System frameworks are provided by Apple and include UIKit, Foundation, and Core Data.

• Third-party frameworks are developed by external developers and can be integrated into iOS apps, such as Alamofire and Firebase.

• Custom frameworks are created by developers for specific project needs and can be reused...read more
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Machine Coding Round

Low level design - ATM design

High level design - Uber

Q1. Director of engineering round
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Q2. Motivation to join the company
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Q3. Previous roles and responsibilities held
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One machine coding round, parking lot question

Q1. Question related to parking lot
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Q2. Current project related questions
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Q1. High level design
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Q2. Yet to appear ......
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Q1. Which programming language would you use in which situation?
Ans. 
I would use Python for data analysis, Java for enterprise applications, and JavaScript for web development.
• Python - data analysis, machine learning, scientific computing (e.g. pandas, numpy)

• Java - enterprise applications, backend development (e.g. Spring framework)

• JavaScript - web development, front-end development (e.g. React, Angular)
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Create a service to assign a delivery operator

Q1. Design Uber ride assignment system
Ans. 
Design a system for assigning Uber rides efficiently and fairly
• Use a matching algorithm to pair riders with drivers based on location, availability, and other factors

• Implement a dynamic pricing system to incentivize drivers to accept rides in high-demand areas

• Consider implementing a rating system for both riders and drivers to ensure quality service

• Utilize real-time data and analytics to optimize ride assignments and r
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Q1. Design BookMyShow
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Q1. What qualities do you see in a leader
Ans. 
A leader should possess qualities such as communication skills, empathy, decisiveness, and the ability to inspire and motivate others.
• Communication skills - A leader should be able to effectively communicate with team members, stakeholders, and other leaders.

• Empathy - A good leader should be able to understand and relate to the emotions and experiences of others.

• Decisiveness - Leaders should be able to make tough decis...read more
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Machine coding round, try to come up with at least one working requirement

Q1. Low level design
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Q2. Cant share the exact quesy
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Q1. High level design
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Q1. Hiring manager round
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This was a live coding round where the problem statement was shared 15 minutes before the interview. The time duration was 2 hours.
The problem statement was a Driver allocation system. I had to write few APIs such as:
1) take input for source, destination, distance
2) allocate free driver to new booking
3) record driver's

The complete backend app had to be developed for this to make a working code. The database, language was completely free for choosing.
The program had to be developed on the system and code had to be shared on mail later.

Q1. Write a code in Go to find kth minumum element from a given list of numbers.
Ans. 
Code in Go to find kth minimum element from a given list of numbers.
• Sort the list of numbers in ascending order

• Return the kth element from the sorted list
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Q2. How do goroutines work internally?
Ans. 
Goroutines are lightweight threads that are managed by Go runtime.
• Goroutines are created using the 'go' keyword.

• They are multiplexed onto OS threads by Go runtime.

• They communicate using channels.

• They are scheduled cooperatively, not preemptively.

• They have a small stack size (2KB) compared to OS threads.

• They are used extensively in Go for concurrency and parallelism.
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Q1. Design a system for food delivery app like Swiggy. Then questions based on the design.
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Q1. Have you ever faced OutOfMemoryError? How did you resolve that?
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Q2. How you will load text data into DB systems?
Ans. 
Text data can be loaded into DB systems using various methods such as SQL INSERT statements, bulk loading, or ETL processes.
• Use SQL INSERT statements to insert text data into the database one record at a time.

• For large datasets, consider using bulk loading techniques like BULK INSERT or LOAD DATA INFILE.

• ETL (Extract, Transform, Load) processes can be used to extract text data from different sources, transform it as per...read more
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