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About the Role
This role provides an environment where you can engage in experience design with a management perspective, not just engineering tasks, and grow into a leader who will drive the Mercari Group in the future. For those aiming to become future product leaders, this role offers the opportunity to take on challenges from both business growth and social problem-solving perspectives.
Responsibilities
- Review security designs and processes.
- Develop and deploy security countermeasures.
- Conduct penetration tests.
- Monitor systems and analyze logs.
- Develop logging infrastructure.
- Perform security reviews and create threat models.
- Design and implement security automation or dashboards.
- Conduct web and mobile application security testing.
- Manage technical projects.
- Participate in threat modeling, code reviews, and security testing under the guidance of senior engineers to help identify and reduce risk in Mercari’s systems.
- Develop or enhance automation scripts for common security tasks such as compliance checks, asset inventory reconciliation, and alerting.
- Conduct focused security research on a supervised topic (e.g., AI system security, supply chain risks), summarize key findings, and propose actionable improvements for Mercari.
- Support vulnerability management processes by helping triage security findings, verify issues, and coordinate with developers on remediation efforts.
- Contribute to internal documentation, including secure development guidelines, AI security best practices, security playbooks, and onboarding material for engineers.
- Assist in security monitoring efforts, such as analyzing logs to detect anomalies, tuning detection rules, and helping track misconfigurations or policy violations.
Requirements
- Shared understanding and belief in our company’s mission and values.
- Strong interest in cybersecurity and engineering.
- Programming experience with one or more programming languages including but not limited to: Go, Python, PHP, JavaScript.
- Enrolled in a Bachelor's degree (or higher) program or technical school in Computer Science, Information Security, or other engineering-focused major.
- Effective interpersonal and communication skills.
- Basic familiarity with Linux, including common commands and scripting.
- Foundational knowledge of SQL and data querying.
- Basic understanding or strong interest in any of the following: Experience attending or speaking at domestic and international security conferences, such as SECCON, Hardening Project, Black Hat, or DEF CON.
- Hands-on experience in security practices such as participating in CTF (Capture The Flag) competitions, bug bounty programs, or penetration testing.
- Knowledge of Web or mobile application security testing.
- Public cloud infrastructure platforms (GCP, AWS or Azure).
- Container and orchestration technologies (Docker, Kubernetes).
- Security automation and DevSecOps.
- Experience leveraging AI for security operations automation and the protection of AI-driven systems.
- Basic experience with software development tools such as Git, dependency management, build and deployment tools.
- Understanding of modern Web or mobile applications.
- English or Japanese: Independent (CEFR-B2).
Skills
- Cybersecurity
- Engineering
- Go
- Python
- PHP
- JavaScript
- Linux
- SQL
- CTF
- Bug bounty programs
- Penetration testing
- Web application security testing
- Mobile application security testing
- GCP
- AWS
- Azure
- Docker
- Kubernetes
- DevSecOps
- AI for security operations automation
- Git
- Software development tools
Location
- Japan (Roppongi)
Work Type
- Permanent (New Graduate)
- Full-time
Experience Level
- New graduate
Education Level
- Bachelor's degree (or higher) program or technical school in Computer Science, Information Security, or other engineering-focused major
About the Company
- Circulate all forms of value to unleash the potential in all people.
- 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.
- Mercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari.
- 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
Equal Opportunity
- 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.