Deliveroo Interview Questions and Answers

Hackerrank - Android Fundamentals

Android Application Assignment

Q1. Design a system where users can claim 6M burgers in 10 minutes
Ans. 
Design a system to allow users to claim 6M burgers in 10 minutes
• Implement a scalable backend system to handle high volume of requests

• Use load balancing to distribute requests evenly across servers

• Set up a queue system to manage incoming requests and process them efficiently

• Implement caching mechanisms to reduce response times

• Consider implementing rate limiting to prevent abuse of the system
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Q2. How do you handle concurrent requests
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Q1. Tell me about a time you supported a Junior Engineer
Ans. 
I mentored a junior engineer on a project, providing guidance and support throughout the process.
• Assigned specific tasks and provided clear instructions

• Offered regular check-ins and feedback on their progress

• Encouraged them to ask questions and seek help when needed
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Q2. Monolith vs Microservices
Ans. 
Monolith is a single, large application while Microservices is a collection of small, independent services.
• Monolith is easier to develop and test as it is a single unit.

• Microservices offer better scalability and flexibility as each service can be developed, deployed, and scaled independently.

• Monolith can lead to dependencies and bottlenecks, while Microservices can be more resilient to failures.

• Microservices allow for ...read more
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1 hr. moderate sql sceraio questions

Moderate 1 hr modelling and system design

Q1. Moderate 30 mins
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Design a cron parser

Q1. Design a system to distribute 6M burgers in 10 minutes.
Ans. 
Utilize multiple distribution centers, automated burger assembly lines, and efficient transportation to distribute 6M burgers in 10 minutes.
• Set up multiple distribution centers strategically located to cover a wide area.

• Implement automated burger assembly lines to quickly produce a large number of burgers.

• Utilize high-speed transportation methods such as drones or conveyor belts to deliver burgers to various locations.

• ...read more
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Q1. 2-3 standard scenarios
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Q1. How you resolved conflicts in your team
Ans. 
I resolved conflicts in my team by promoting open communication, active listening, and finding common ground.
• Encouraged team members to openly express their concerns and perspectives

• Actively listened to all parties involved to understand their viewpoints

• Facilitated discussions to find common ground and reach a mutually agreeable solution
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Q2. About a time where you received difficult feedback
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Q1. Design a system that distributes 6Million burgers in 10 min
Ans. 
Utilize multiple distribution centers, automated assembly lines, and efficient transportation to distribute burgers quickly.
• Set up multiple distribution centers in strategic locations to cover a wide area

• Implement automated assembly lines to quickly prepare and package burgers

• Utilize efficient transportation methods such as drones or high-speed delivery vehicles

• Coordinate logistics and timing to ensure smooth and timel...read more
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Q2. No user can claim more than once. You can over distribute but not under distribute
Ans. 
Ensure each user can only claim once, can distribute extra but not less
• Implement a system to track claimed rewards by users

• Set up validation to prevent users from claiming more than once

• Consider implementing a queue system to distribute rewards fairly

• Use a database to store user claims and track distribution
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Q1. Take home assignment: Implement Custom Cron job parser
Ans. 
Implement a custom cron job parser as a take-home assignment for Software Engineer II position.
• Understand the cron syntax and how it works

• Parse the cron expression into separate fields (minute, hour, day of month, month, day of week)

• Implement logic to calculate the next execution time based on the current time and cron expression

• Handle edge cases like leap years, different month lengths, etc.

• Test your implementation wi...read more
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Q2. Interview: Add support to year fields, Get Next N schedules
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Q1. Overview of my experience and how it is relevant to the applied role.
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Q1. Tell me about a time when you handled difficult stakeholder
Ans. 
Handled a difficult stakeholder by actively listening, addressing concerns, and finding a mutually beneficial solution.
• Actively listened to the stakeholder's concerns and validated their feelings

• Communicated openly and transparently about the situation

• Worked collaboratively to find a solution that met both parties' needs
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