30+ Go-Jek Interview Questions and Answers

Entering the market with a new massy product

• Research the existing product and its market

• Identify the gaps and pain points of the existing product

• Develop a unique value proposition for the new product

• Prioritize features based on customer needs and available resources

• Create a wireframe to visualize the product

• Test the wireframe with potential customers for feedback

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

Determine the minimum number of operations needed to make a binary string beautiful by having alternating 0s and 1s.

• Iterate through the binary string and count the number of operations needed to make it beautiful by flipping the bits if they are the same.

• Keep track of the current bit and compare it with the next bit to determine if an operation is needed.

• Return the total number of operations needed for each test case.

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)

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.

Metrics for a photo-sharing app MVP and communicating success to upper management

• Metrics: user acquisition, retention, engagement, user-generated content, referral rate, conversion rate, churn rate, revenue

• Dashboard hierarchy: team-specific metrics, overall app metrics, comparison with industry benchmarks

• Communicating success: tie metrics to business goals, highlight improvements and areas for growth, use data visualization

• Examples: increase in daily active users, decrease in...read more

Find the rectangle within a matrix that has the maximum sum of its elements.

• Iterate through all possible rectangles within the matrix

• Calculate the sum of each rectangle

• Keep track of the maximum sum found

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

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 app performance

• Choose the appropriate image formats (e.g....read more

Reverse nodes within blocks of specified sizes in a singly linked list.

• Iterate through the linked list and reverse nodes within each block size specified in the array.

• Handle cases where block size exceeds remaining nodes by reversing the remaining nodes as one block.

• Update pointers accordingly to reverse the nodes within each block size.

Product expectations clear but engineering team struggling to architect solution. How did you unblock them?

• Identified the specific challenges the engineering team was facing

• Collaborated with the team to brainstorm potential solutions

• Brought in outside expertise or resources if necessary

• Prioritized and broke down the problem into manageable tasks

• Provided clear communication and support throughout the process

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 across multiple apps.

• Frameworks provide pre-built functio...read more

As a Product Lead, I own metrics such as user engagement, retention, and revenue growth. These metrics generate RoI by improving the overall user experience and driving business growth.

• I own metrics such as user engagement, retention, and revenue growth.

• By improving user engagement, we can increase the time users spend on our platform and reduce churn.

• By improving retention, we can increase the lifetime value of our customers and reduce acquisition costs.

• By driving revenue gr...read more

I own the product metrics related to user engagement and retention.

• I track user retention rate and churn rate to understand user behavior.

• I analyze user engagement metrics such as daily active users, time spent on the app, and feature usage.

• I use A/B testing to measure the impact of new features on user engagement and retention.

• I collaborate with the data analytics team to ensure data accuracy and consistency.

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 reduce wait times

Fragment lifecycle in Android involves various states and methods for managing UI components.

• Fragments have several lifecycle states such as created, started, resumed, paused, stopped, and destroyed.

• Methods like onCreate(), onCreateView(), onResume(), onPause(), onStop(), onDestroy() are used to manage fragment lifecycle.

• Fragment lifecycle is closely tied to the hosting Activity's lifecycle.

• Example: When a fragment is added to an activity, it goes through onCreate(), onCreate...read more

To solve a global search problem, I would utilize advanced algorithms and technologies to efficiently search through vast amounts of data from various sources.

• Utilize advanced search algorithms like BFS, DFS, A*, etc.

• Implement indexing and caching techniques to speed up search process.

• Leverage distributed computing and parallel processing for faster search results.

• Utilize machine learning and natural language processing for better search relevance.

• Consider implementing a hybr...read more

GBM is a machine learning algorithm that builds multiple decision trees to predict outcomes and combines them to improve accuracy.

• GBM stands for Gradient Boosting Machine

• It builds multiple decision trees sequentially, each one correcting errors made by the previous tree

• The final prediction is a combination of predictions from all the trees

• GBM is an ensemble learning technique that is popular for its high accuracy and flexibility

Designing test cases for a vending machine server to ensure functionality and reliability.

• Identify all possible user interactions with the vending machine server (e.g. selecting items, making payments)

• Test the communication between the server and the vending machine hardware

• Verify the server's ability to handle concurrent transactions

• Check for error handling and recovery mechanisms in case of failures

Yes, building a chat app can improve communication and collaboration within the team.

• Enhances real-time communication

• Facilitates quick decision-making

• Increases team collaboration

• Can integrate with project management tools for better workflow

Testing allows me to ensure the quality and reliability of software products before they are released to customers.

• I enjoy the challenge of finding bugs and improving the overall quality of the product.

• I have a keen eye for detail and enjoy the investigative aspect of testing.

• I believe that testing is just as important as development in the software development lifecycle.

• I have a passion for ensuring that users have a positive experience with the software.

• I appreciate the opp...read more

Choosing the right framework technology is crucial for successful software development testing.

• Consider the requirements of the project and the team's expertise when selecting a framework.

• Popular choices include Selenium for web applications, Appium for mobile apps, and JUnit for unit testing.

• Evaluate the scalability, maintainability, and community support of the framework before making a decision.

A user-friendly to-do list app with customizable categories, reminders, and collaboration features.

• Allow users to create multiple categories for tasks (e.g. work, personal, groceries)

• Include a calendar view for easy scheduling and tracking

• Enable setting reminders for important tasks

• Allow sharing and collaboration on tasks with others

• Include a search function for easy task management

Search for a specific word in a file

• Read the file line by line

• Check each line for the search word

• Return the line number if word is found

Design elevator system for efficient and safe transportation

• Consider the number of floors in the building

• Implement algorithms for efficient elevator routing

• Include safety features such as emergency stop buttons

• Design user interface for passengers to select floors

• Utilize sensors for detecting weight and preventing overloading

Convert Roman numerals to integers

• Create a mapping of Roman numerals to integers

• Iterate through the input Roman numeral string from right to left

• If the current numeral is smaller than the one after it, subtract its value from the total, else add its value to the total

Design a ticketing system for managing and tracking tickets.

• Create a user-friendly interface for users to submit tickets.

• Implement a system for assigning tickets to appropriate teams or individuals.

• Include a feature for tracking the status of tickets and updating users on progress.

• Allow for prioritization of tickets based on urgency or impact.

• Generate reports on ticket resolution times and overall performance.

• Integrate with email notifications for updates on ticket status.

• Inc...read more

K-means is a popular clustering algorithm used to partition data points into K clusters based on similarity.

• K-means aims to minimize the sum of squared distances between data points and their respective cluster centroids.

• It requires the number of clusters (K) to be specified in advance.

• The algorithm iteratively assigns data points to the nearest cluster centroid and updates the centroids until convergence.

• K-means is sensitive to initial centroid selection and may converge to ...read more

Design a chat system for real-time communication

• Use WebSocket for real-time communication

• Implement user authentication and authorization

• Store chat messages in a database for persistence

• Support features like group chat, file sharing, and message encryption