Go-Jek Senior Software Engineer Interview Questions and Answers

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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I'm motivated to join the company for its innovative projects, collaborative culture, and commitment to professional growth.
• The company's focus on cutting-edge technology aligns with my passion for innovation, as seen in my previous work on AI-driven applications.

• I admire the collaborative culture here, which fosters teamwork and creativity, similar to my experience in agile development teams.

• The commitment to professi...read more
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Q3. Previous roles and responsibilities held
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I have held roles as a software engineer, team lead, and project manager, focusing on full-stack development and agile methodologies.
• Led a team of 5 engineers in developing a microservices architecture for a healthcare application, improving scalability by 30%.

• Managed end-to-end project lifecycle for a financial software product, ensuring timely delivery and adherence to budget constraints.

• Implemented CI/CD pipelines t...read more
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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
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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
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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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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
Ans. 
Design REST APIs for a pay later wallet system with user balance, transactions, and fund additions.
• GET /wallet/{userId} - Retrieve the user's wallet balance.

• POST /wallet/{userId}/transaction - Create a new transaction using wallet balance.

• POST /wallet/{userId}/add-funds - Add money to the user's 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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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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