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About Mercari
We believe the world needs a place where people can exchange their loved goods. That’s why we built Mercari—to connect people who want to buy and sell things of emotional value through their mobile phones. Mercari has grown to become a leading community-powered marketplace that brings together millions of people every day.
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Position
Our Mission
Mercari is a Japan-based company with the mission of “create value in a global marketplace where anyone can buy & sell.” Having continuously worked toward this goal since our founding in 2013, we are now transforming from a startup into a global player. While this transformation brings its own specific set of challenges, we believe that solving them one after another will allow us to fully achieve our mission. Are you interested in working together to take on these exciting challenges?
Our Culture
Mercari’s culture has been central to the company since our founding, with the three core values of Go Bold, All for One, and Be a Pro. In addition, the “Trust & Openness” value was introduced to embody our culture of mutual trust, where information remains transparent and rules are kept to a minimum. Regardless of how big Mercari gets, our culture is essential to achieving our mission and will be promoted throughout our organization.
Position Overview
Work Responsibilities
- Mercari is looking for a security engineer to join our Product Security Team in Tokyo. The Product Security Team ensures that Mercari products meet security requirements and investigates, tracks, and assists in fixing security issues. The team strives to be a business enabler working on a variety of tasks and applying a risk-based approach to security-related decision making
- As a Product Security Engineer you will be responsible for eliciting and communicating security requirements to product teams, performing threat modeling, design reviews, and security testing. You will also be involved in evaluating, designing, developing, and deploying automated security assessment solutions (DAST, SAST, SCA, etc.) and take on the challenge of ensuring the safety of Mercari’s development lifecycle
Bold Challenges
- Work with a modern, cloud-first development and deployment environment
- This position will allow you to take full advantage of your skills and experience because you will work on a variety of projects ranging from an online marketplace to payments and IoT
- Mercari offers a multicultural environment with colleagues from over 40 different countries and various backgrounds (experiences and skills), so you will be able to discuss and address issues from different perspectives and use that for personal growth
Roles and Responsibilities
- Review product designs to define necessary security requirements based on threat modeling
- Review proposed architecture and propose a set of security controls in order to minimize risk
- Review source code to find security problems and potential vulnerabilities
- Conduct vulnerability assessments and penetration testing on Mercari’s Web, iOS, and Android applications
- Automate security checks and tests so that they can be easily and transparently plugged into the CI/CD pipeline
- Develop technical solutions to help mitigate security vulnerabilities
- Maintain technical and security standards for Web and mobile application technologies
- Educate developers on secure coding practices with workshops, talks, and lessons
- Evaluate and investigate suspected security events or incidents and perform remediation in accordance with Incident Response procedures
- Collaborate with information security officers, the legal team, and internal auditors on technical security matters
Your qualification
- 2+ years of experience analyzing the security of systems (penetration testing, Web application security testing, vulnerability scanning, threat modeling, etc.)
- Bachelor's degree or equivalent practical experience
- Programming experience with one or more programming languages including but not limited to: Go, PHP, Java, Ruby, Python, C/C++, Objective-C, Swift, Kotlin, or JavaScript
- Good understanding of modern Web application architecture, TLS, HTTP, TCP/IP, and standard network and system security technologies
- Experience with modern software development tools, such as distributed version control systems (git), dependency management, build systems, and CI/CD pipelines
- Effective interpersonal and communication skills
- Strong teamwork skills in a diverse environment
Will be a plus
- In-depth technical knowledge of security engineering, computer and network security, Unix-based operating systems, mobile security, authentication, security protocols, and applied cryptography
- Good understanding of development methodologies such as Object-oriented Programming (OOP), Domain-driven Design (DDD), and Test-driven Development (TDD)
- Strong experience in securing both backend (Go, PHP) and frontend (Web, JavaScript, iOS, Android) applications
- Good understanding of microservice architecture and related security patterns
- Knowledge of container and orchestration technology like Docker and Kubernetes
- Experience working with large-scale cloud infrastructure and services (GCP or AWS)
- Experience working in an agile and DevOps-centric environment
Screening Criteria
- Technical experience
- Communication skills
- Culture fit to both the team and Mercari as a whole
Language Requirements
- English or Japanese: Independent (CEFR - B2)
- (either Japanese Independent (CEFR - B2) + English Basic (CEFR - A2) OR English Independent (CEFR - B2) + Japanese Basic (CEFR -A2)
For details about CEFR, see here
What we offer
Employment Status
Full-time
- Probationary period: First 3 months after joining the company (During this period your contract conditions will be the same as that of a permanent employee)
Office Location
Roppongi
- Smoking is prohibited within our offices
- Mercari has introduced a work style policy called “Your Choice.” Each member is free to choose whether they want to work in the office or work fully remote.
*Exceptions made for certain kinds of work
Work Hours
- Full flextime (no core time)
*Does not apply to all positions
Holidays
- Two days off per week (as well as national holidays, New Year's break, etc.)
- Paid leave, congratulatory and bereavement leave, relax days, sick leave
Salary
- Annual salary paid in 12 monthly installments (including fixed overtime allowance)
- Based on skills, experience, and abilities
- Reviewed twice a year
Benefits
- Complete health and social insurance
- Incentive program
- Language learning support
- Support systems, including those that benefit employee family members
- Translation/interpretation support
*See this page for details
Support
- Relocation Support
*See this page for details
Additional details
Media
Corporate Sites
- Mercari, Inc.
- Merpay, Inc. [Japanese]
- Souzoh, Inc.
- Mercoin, Inc. [Japanese]
- Mercari US
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