Mercari is looking for a talented Software Engineer at the MG5 level to join our dynamic team. This role involves designing, developing, and maintaining scalable and high-performance software solutions that power our e-commerce platform. You will collaborate with cross-functional teams to deliver innovative features and contribute to the continuous improvement of our engineering practices.
Rounds·3
Timeline·~14d
Experience·5 - 8 yrs
Comp band·US$120000 - US$150000
Interview time·150 min
Evaluation
What they measure.
Technical proficiency in relevant programming languages and frameworks.
Strong understanding of data structures, algorithms, and software design principles.
Ability to design scalable, reliable, and maintainable systems.
Effective problem-solving and debugging skills.
Good communication and collaboration skills.
Alignment with Mercari's values and culture.
Experience in leading technical projects and initiatives.
Ability to mentor and guide junior engineers.
Demonstrated leadership potential and ownership.
Proactive approach to identifying and solving problems.
Understanding of Mercari's business and product.
Ability to translate business requirements into technical solutions.
Product sense and user empathy.
Adaptability to changing priorities and technologies.
Effective communication and interpersonal skills.
Ability to work collaboratively in a team environment.
Openness to feedback and continuous learning.
Cultural fit with Mercari's values (e.g., Speed, Simplicity, Diversity).
02Practice coding problems on platforms like LeetCode, HackerRank, focusing on medium to hard difficulty.
03Study system design principles and common patterns for scalable applications.
04Understand Mercari's business, products, and recent news.
05Prepare examples for behavioral questions using the STAR method (Situation, Task, Action, Result).
06Research Mercari's engineering blog and tech stack.
07Practice explaining your thought process clearly and concisely.
Study plan
Fig · Study plan — 04 phases
01 / 04
01
Phase 01 of 04
Data Structures & Algorithms
Weeks 1-2: DSA fundamentals and practice.
Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash maps, sorting, searching, dynamic programming, and greedy algorithms. Practice implementing these and analyzing their time and space complexity.
02
Phase 02 of 04
System Design
Weeks 3-4: System Design principles and patterns.
Weeks 3-4: Dive into System Design. Study concepts like scalability, availability, reliability, load balancing, caching, database design (SQL vs. NoSQL), message queues, and microservices architecture. Work through common system design interview questions.
03
Phase 03 of 04
Behavioral Preparation
Week 5: Behavioral questions and STAR method.
Week 5: Prepare for Behavioral and Situational Questions. Reflect on your past experiences related to teamwork, problem-solving, leadership, conflict resolution, and handling failure. Use the STAR method to structure your answers.
04
Phase 04 of 04
Company Research & Mock Interviews
Week 6: Company research and mock interviews.
Week 6: Company Research and Mock Interviews. Understand Mercari's mission, values, products, and recent developments. Conduct mock interviews with peers or mentors to simulate the actual interview environment and get feedback.
Questions
Commonly asked.
Describe a complex system you designed or contributed to. What were the key challenges and how did you address them?
How would you design a recommendation engine for Mercari?
Given a scenario with high traffic, how would you ensure system stability and performance?
Tell me about a time you disagreed with a technical decision. What did you do?
How do you approach code reviews?
What are your favorite programming languages and why?
Explain the concept of eventual consistency.
How would you design a notification system for user activity?
Describe a situation where you had to learn a new technology quickly.
Locations
Regional differences.
Fig · Regions — 02 locations
01 / 02
Location
Tokyo
Interview focus
System DesignScalabilityProblem-SolvingLeadership and Mentorship
Common questions
How would you design a system to handle real-time inventory updates for millions of products?
Describe a challenging technical problem you faced and how you solved it.
What are your thoughts on microservices vs. monolithic architecture for an e-commerce platform?
How do you ensure the scalability and reliability of your code?
Tell me about a time you had to mentor a junior engineer.
Tips
Be prepared to discuss large-scale system design principles.
Highlight your experience with distributed systems and cloud technologies.
Showcase your ability to lead and mentor other engineers.
Emphasize your understanding of Mercari's business and how technology supports it.
Location
Remote
Interview focus
API DesignDatabase OptimizationProduct SenseCollaboration and Influence
Common questions
Design an API for a feature that allows users to follow other users.
How would you optimize a database query that is causing performance issues?
Discuss your experience with A/B testing and its impact on product development.
What are your strategies for debugging complex issues in a production environment?
Describe a situation where you had to influence a technical decision.
Tips
Focus on practical problem-solving and coding skills.
Be ready to discuss your experience with specific technologies relevant to Mercari's stack.
Demonstrate your ability to collaborate effectively with product managers and designers.
Prepare examples of how you've driven technical initiatives and influenced outcomes.
Rounds
Round-by-round.
Expand a step for evaluation criteria, sample questions, and prep notes.
Med
Technical Interview (Coding) · 45 min · Software Engineer (Peer)
This round focuses on your fundamental coding skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your problem-solving approach and communication skills. Be prepared to explain your thought process, discuss time and space complexity, and consider edge cases.
What they look for
Clean, well-structured, and efficient code.Logical and systematic approach to problem-solving.Ability to explain trade-offs of different solutions.Good debugging skills.
Evaluation
Coding proficiency
Problem-solving approach
Understanding of data structures and algorithms
Code clarity and efficiency
Sample questions
Given an array of integers, find the contiguous subarray with the largest sum.
ArrayDynamic Programming
Implement a function to reverse a linked list.
Linked ListPointers
Find the kth smallest element in a binary search tree.
TreeBinary Search TreeRecursion
Prep for this round
01Practice coding problems on platforms like LeetCode.
02Focus on understanding the underlying data structures and algorithms.
03Practice explaining your solutions out loud.
04Be ready to write code on a whiteboard or shared editor.
Common rejection reasons
×Inability to articulate thought process clearly.
×Lack of fundamental data structures and algorithms knowledge.
×Poor coding practices (e.g., inefficient solutions, lack of error handling).
×Difficulty in debugging code.
Hard
System Design Interview · 60 min · Senior Software Engineer / Engineering Manager
This round evaluates your ability to design and architect complex, scalable systems. You'll be presented with an open-ended problem, such as designing a specific feature or a large-scale service. The interviewer will assess your understanding of distributed systems, databases, caching, load balancing, and other relevant technologies. Focus on clarifying requirements, proposing a high-level design, and then diving deeper into specific components, discussing trade-offs and potential bottlenecks.
What they look for
Ability to break down complex problems into smaller components.Knowledge of various architectural patterns and technologies.Consideration of non-functional requirements (scalability, reliability, availability).Clear communication of design choices and justifications.
Evaluation
System design capabilities
Scalability and performance considerations
Understanding of distributed systems
Trade-off analysis
Problem-solving in a large-scale context
Sample questions
Design a URL shortening service like bit.ly.
System DesignScalabilityDatabases
Design a real-time notification system.
System DesignWebSocketsScalability
How would you design a system to handle millions of concurrent users for a live streaming service?
System DesignHigh AvailabilityLoad Balancing
Prep for this round
01Study system design concepts and common patterns.
02Practice designing systems like Twitter feed, URL shortener, etc.
03Understand trade-offs between different technologies (e.g., SQL vs. NoSQL, REST vs. gRPC).
04Think about scalability, availability, and reliability from the start.
Common rejection reasons
×Inability to design scalable and robust systems.
×Lack of understanding of distributed systems concepts.
This round focuses on your past experiences, behavioral competencies, and cultural fit. You will be asked questions about how you've handled specific situations in previous roles, such as dealing with conflict, managing challenging projects, or working in a team. Use the STAR method (Situation, Task, Action, Result) to provide clear and concise answers backed by specific examples. The interviewer will also assess your motivation, career aspirations, and alignment with Mercari's values.
What they look for
Examples of teamwork, leadership, and conflict resolution.Honesty and self-awareness.Alignment with Mercari's values.Passion for technology and the company's mission.
Evaluation
Behavioral competencies
Teamwork and collaboration
Problem-solving approach in past experiences
Cultural fit
Motivation and career goals
Sample questions
Tell me about a time you had to work with a difficult colleague.
BehavioralTeamworkConflict Resolution
Describe a project where you took initiative or leadership.
BehavioralLeadershipOwnership
How do you handle constructive criticism?
BehavioralFeedbackGrowth Mindset
Why are you interested in Mercari and this specific role?
BehavioralMotivationCompany Fit
Prep for this round
01Prepare examples for common behavioral questions using the STAR method.
02Reflect on your strengths, weaknesses, and career goals.
03Research Mercari's company culture and values.
04Be prepared to ask thoughtful questions about the role and the team.
Common rejection reasons
×Poor communication or collaboration skills.
×Lack of alignment with company values.
×Inability to provide specific examples for behavioral questions.