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Software Engineer - Experimentation System - Mercari
- Employment Status: Full-time
- Work Hours:Full Flextime (no core time)
- Office: Roppongi
For more details, see the Overview of Our Positions section on our Careers site.
About Mercari
Circulate all forms of value to unleash the potential in all people
"What can I do to help society thrive with the finite resources we have?" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential. For more information about Mercari Group’s mission, see Mercari’s Culture Doc
Organization/Team Mission
Mercari Engineering Principles
Mercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari. The Engineering Principles are designed to complement the organizational identity (Mercari’s mission, values, and culture) from an engineering viewpoint.
These principles ultimately help us achieve Mercari’s mission by defining the ideal state we seek to realize in the long term.
- Passion For The Product
- Grow Together
- Solve Through Mechanisms
- Collaborate Openly
For more details, please see the following link:
- Engineering Culture
In the Strategic Experimentation & Analytics (SEA) team, we are responsible for the administration, operation, and optimization of the Experimentation Platform, a system that enables anyone at Mercari to perform A/B tests and experiments and safely and gradually roll out new features. The team oversees the Experimentation Platform and Feature Flags systems across prod and dev, handling incident response, demos, and roadmap planning while coordinating A/B testing and feature rollouts.
- Everyone can learn and acquire empirical knowledge about customer behavior and our service domain
- Anyone at Mercari can run experiments at scale
- Everyone can understand and trust reproducible experiments
- All product changes can be rolled out or rolled back quickly and safely via Feature Flags
See here for more information about our mission and values.
This role is responsible for ensuring the delivery of a highly cost-effective data analytics environment. The successful candidate will build and maintain a mechanism that naturally fosters cost-awareness among users, eliminates operational waste, and ensures that finite computing resources are precisely allocated to high-priority business tasks.
Work Responsibilities
Continuously improve the system for access control, resource allocation, cost optimization, and usability to deliver sustained value to engineering and product teams.
- Design and maintain a scalable distributed system
- Implement new features on an existing code base
- Scale the current product to handle 10x load
- Design and Implement Agentic Workflows
Unique Challenges
Architecting for modern AI Workflows. As the organization transitions to becoming AI-native, you will be instrumental in designing and building the systems that highly efficiently support new use cases, such as automated configuration, control and data utilization via AI agents.
- Ability to design and maintain a scalable distributed system
- Operate and debug via observability metrics and kubernetes
- Basic familiarity with cloud based databases and tools (Google Cloud, BigQuery, Redis, etc)
- Understanding of stateless API design and protocols (gRPC)
- Define, implement, test, and deploy core features in an existing code base independently
- Communicate effectively with technical and non-technical stake-holders
- Quickly acquire a solid foundation in Software Engineering concepts such as Domain Driven Design, Event Sourcing, Service Oriented Architecture
Qualifications
Passionate about building tools for developers, with a strong ability to collaborate with the team to identify and implement features.
- Required Experience/Skills
- Go, Python, Typescript
- Good CS fundamental
- Experience with Cloud technologies
- communicate effectively with technical and non-technical stake-holders
- Ability to quickly acquire a solid foundation in Software Engineering concepts such as Domain Driven Design, Event Sourcing, Service Oriented Architecture
- Preferred Experience/Skills
- Bazel, Cuelang, Terraform, GCP, Kubernetes
- Implementing parsers and virtual machines
- Memory allocation optimization
- Language
- Japanese: A2
- English: B2 and above
For details about CEFR, see here.
Learn More About Mercari Group
- Careers site: https://careers.mercari.com/en/
- Mercan: https://mercan.mercari.com/en/
- Social media: X / Linkedin
Recruiting at Mercari
At Mercari Group, we value empathizing with and embodying the mission and values of the Group and each company. To promote the creation of an organization that maximizes the total amount of value exhibited by all members, we would like to understand the experience and skills of each candidate as accurately as possible.
Recruiting cycle at Mercari Group
- Application screening
- Skill assessment: For engineering positions, you will be asked to complete a skill assessment on HackerRank or GitHub. For non-engineering positions, you may be asked to complete an assessment depending on the position. (The timing of the assessment may coincide with the interview process.)
- Interview: The number of interviews may vary depending on the position.
- Reference check: We will ask for online references around the timing of the final interview.
- Offer: Offers will be determined carefully in consideration of the final interview and the reference check.
Learn more about our recruiting process here.
Equal Opportunity Hiring
Here at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value. We also firmly believe that a mindset of Inclusion & Diversity is essential for us to achieve our mission.
This, of course, extends to our hiring practices as well. Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background. For more details, please read our I&D statement.
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