Deliveroo

Software Engineer 1

Software EngineerL3Medium

This interview process is for a Software Engineer L3 role at Deliveroo. It is designed to assess a candidate's technical skills, problem-solving abilities, and cultural fit within the company.

Rounds

3

Timeline

~14 days

Experience

1 - 3 yrs

Salary Range

US$90000 - US$120000

Total Duration

135 min

Overall Evaluation Criteria

Technical Skills

Problem-solving approach
Algorithmic thinking
Code quality and efficiency
Understanding of data structures

Communication & Collaboration

Communication clarity
Ability to articulate thought process
Active listening skills
Collaboration potential

Cultural Fit

Alignment with Deliveroo's values
Motivation and enthusiasm for the role
Adaptability and resilience
Proactiveness and ownership

Preparation Tips

1Review fundamental data structures and algorithms.
2Practice coding problems on platforms like LeetCode or HackerRank.
3Understand core computer science concepts (e.g., operating systems, databases, networking).
4Prepare to discuss your past projects in detail, focusing on your contributions and challenges.
5Research Deliveroo's mission, values, and recent news.
6Practice behavioral questions using the STAR method (Situation, Task, Action, Result).
7Be ready to discuss your understanding of system design principles for scalable applications.

Study Plan

1

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms fundamentals. Practice implementations and complexity analysis.

Weeks 1-2: Focus on foundational data structures (arrays, linked lists, stacks, queues, trees, graphs, hash maps) and their common algorithms (sorting, searching, graph traversal). Practice implementing these from scratch and analyze their time and space complexity.

2

System Design

Weeks 3-4: System Design principles. Focus on scalability, databases, caching, and APIs.

Weeks 3-4: Dive into system design concepts. Study topics like scalability, availability, reliability, load balancing, caching, databases (SQL vs. NoSQL), and API design. Work through common system design interview questions.

3

Behavioral and Situational Questions

Week 5: Behavioral questions preparation using STAR method. Align with company values.

Week 5: Prepare for behavioral and situational questions. Reflect on your past experiences and prepare examples using the STAR method that demonstrate your problem-solving skills, teamwork, and leadership potential. Align your answers with Deliveroo's company values.

4

Final Preparation

Week 6: Mock interviews, company research, and final review.

Week 6: Review your notes, practice mock interviews, and research Deliveroo's products and engineering blog. Ensure you have clear and concise answers for common questions and are ready to ask insightful questions about the role and company.

Commonly Asked Questions

Given an array of integers, find the contiguous subarray with the largest sum.
Design a URL shortening service like bit.ly.
Tell me about a time you failed and what you learned from it.
How would you design a system to track the delivery status of food orders in real-time?
What are the trade-offs between using a relational database and a NoSQL database for a user profile service?
Describe a situation where you had to explain a complex technical concept to a non-technical audience.

Location-Based Differences

London

Interview Focus

Adaptability to local market nuances.Understanding of regional tech trends.Communication skills in the local language.

Common Questions

Tell me about a time you had to deal with a difficult stakeholder.

How do you prioritize your work when faced with multiple urgent tasks?

Describe a challenging technical problem you solved and how you approached it.

Tips

Research Deliveroo's presence and operations in this specific region.
Be prepared to discuss projects relevant to the local market.
Highlight any experience working with diverse, international teams.

New York

Interview Focus

Proficiency in specific technologies prevalent in the US market.Experience with large-scale distributed systems.Ability to work autonomously and drive projects forward.

Common Questions

How do you ensure code quality and maintainability in a fast-paced environment?

Describe a situation where you disagreed with a technical decision and how you handled it.

What are your thoughts on microservices architecture?

Tips

Familiarize yourself with common US tech stacks and best practices.
Prepare examples of projects that demonstrate scalability and performance.
Showcase your ability to contribute to a collaborative and innovative environment.

Process Timeline

1
Coding Challenge45m
2
System Design60m
3
Behavioral and Cultural Fit30m

Interview Rounds

3-step process with detailed breakdown for each round

1

Coding Challenge

Solve coding problems focusing on data structures and algorithms.

Technical Interview (Coding)Medium
45 minSoftware Engineer

This round focuses on your core technical abilities. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to understand the problem, devise a solution, write clean and efficient code, and explain your reasoning. Expect to discuss time and space complexity.

What Interviewers Look For

A structured approach to problem-solving.Correct implementation of algorithms and data structures.Clean and efficient code.Ability to explain the solution and its trade-offs.

Evaluation Criteria

Problem-solving skills
Algorithmic thinking
Coding proficiency
Communication of approach

Questions Asked

Given a binary tree, invert the tree.

Data StructuresAlgorithmsTrees

Find the kth smallest element in a sorted matrix.

Data StructuresAlgorithmsArraysMatrices

Preparation Tips

1Practice coding problems on platforms like LeetCode, focusing on common data structures and algorithms.
2Be prepared to write code on a whiteboard or shared editor.
3Think out loud and explain your thought process as you solve the problem.
4Consider edge cases and test your solution thoroughly.

Common Reasons for Rejection

Inability to articulate thought process clearly.
Lack of fundamental programming knowledge.
Poor problem-solving approach.
2

System Design

Design a scalable system and discuss its components and trade-offs.

System Design InterviewHard
60 minSenior Software Engineer / Architect

In this round, you'll be asked to design a system or a component of a larger system. This could range from designing a URL shortener to a real-time notification system. The focus is on your ability to think about scalability, reliability, availability, and trade-offs. You'll need to discuss various components, their interactions, and potential bottlenecks.

What Interviewers Look For

Ability to design scalable and reliable systems.Understanding of distributed systems concepts.Knowledge of databases, caching, and messaging queues.Ability to justify design choices and discuss trade-offs.

Evaluation Criteria

System design thinking
Scalability and performance
Trade-off analysis
Component interaction

Questions Asked

Design a system to count the number of views for a given YouTube video.

System DesignScalabilityDatabases

Design a rate limiter.

System DesignDistributed SystemsAlgorithms

Preparation Tips

1Study common system design patterns and principles.
2Practice designing systems like Twitter feed, Uber, or a distributed cache.
3Be prepared to draw diagrams and explain your design choices.
4Consider different aspects like data storage, APIs, load balancing, and fault tolerance.

Common Reasons for Rejection

Lack of understanding of system design principles.
Inability to handle scale and performance considerations.
Poor trade-off analysis.
3

Behavioral and Cultural Fit

Discuss past experiences and how they align with the role and company culture.

Behavioral InterviewMedium
30 minHiring Manager / Team Lead

This interview focuses on your past experiences and how they relate to the role and Deliveroo's culture. You'll be asked behavioral questions that require you to provide specific examples using the STAR method. The interviewer wants to understand your work style, how you handle challenges, and your potential fit within the team.

What Interviewers Look For

Evidence of past behavior that predicts future performance.Ability to work effectively in a team.Resilience and ability to learn from mistakes.Enthusiasm for Deliveroo and the role.

Evaluation Criteria

Behavioral competencies
Teamwork and collaboration
Problem-solving in past experiences
Cultural alignment

Questions Asked

Tell me about a time you had to work with a difficult colleague. How did you handle it?

BehavioralTeamworkConflict Resolution

Describe a project you are particularly proud of and your role in it.

BehavioralProject ExperienceOwnership

Preparation Tips

1Prepare examples for common behavioral questions (e.g., teamwork, leadership, conflict resolution, failure).
2Use the STAR method (Situation, Task, Action, Result) to structure your answers.
3Research Deliveroo's company values and try to align your examples with them.
4Be honest and authentic in your responses.

Common Reasons for Rejection

Poor communication skills.
Lack of self-awareness.
Inability to provide specific examples.
Not aligning with company values.

Commonly Asked DSA Questions

Frequently asked coding questions at Deliveroo

View all
Remove Invalid ParenthesesHARDVertical Order Traversal of a Binary TreeHARDCount Number of Nice SubarraysMEDIUMSearch Suggestions SystemMEDIUMFind Words Containing CharacterEASY