Jobs in Japan
Explore hand-picked jobs in Japan for English speakers across tech, education, marketing, and more.
Vetted companies only. Apply from overseas.
Jobs in Japan
Explore hand-picked jobs in Japan for English speakers across tech, education, marketing, and more.
Vetted companies only. Apply from overseas.
MercariThis job posting was originally in Japanese. The English version is automatically translated. Please visit the company site for the most accurate information.
As an intern on Mercari’s Security Engineering team, you will work on security design and process reviews, building and deploying security measures, penetration testing, and other initiatives. Mercari security engineers have a unique role within the company, working on projects that affect the entire organization. You will have the opportunity to engage with the topics below and take responsibility for one area of work of your choice: monitoring and log analysis, development of logging infrastructure, conducting security reviews and creating threat models, designing and implementing security automation and dashboards, security testing of web and mobile applications, or technical project management. Under the guidance of senior engineers, you will participate in threat modeling, code reviews, and security testing to identify and mitigate risks in Mercari’s systems. You will develop and improve scripts to automate common security tasks, such as compliance checks, asset inventory reconciliation, and alert operations. You will conduct security research on specific topics, such as AI system security and supply chain risks, summarize key findings, and propose actionable improvements. You will support the vulnerability management process by triaging and validating security findings and coordinating remediation with developers. You will contribute to creating and updating internal documentation, including secure development guidelines, AI security best practices, security playbooks, and onboarding materials for engineers. You will support security monitoring activities, including log analysis, tuning detection rules, and tracking misconfigurations and policy violations.
- Alignment with Mercari’s mission and values - Strong interest in cybersecurity and engineering - Availability to work at least 20 hours per week for 2–3 months - Development experience in at least one programming language, such as Go, Python, PHP, or JavaScript - Currently enrolled in a university program (bachelor’s degree or higher) or vocational school, majoring in computer science, information security, or engineering - Excellent interpersonal and communication skills - Basic knowledge of Linux, including using common commands and scripts - Basic knowledge of SQL and data querying - English or Japanese proficiency at the Independent level (CEFR B2)
- Basic knowledge of or strong interest in any of the following: participation in or speaking at Japanese events such as SECCON and the Hardening Project, or international conferences such as Black Hat and DEF CON - Practical experience participating in Capture the Flag (CTF) competitions, bug bounty programs, or penetration testing - Public cloud infrastructure platforms (GCP, AWS, Azure) - Container and orchestration technologies (Docker, Kubernetes) - Knowledge of security testing for web or mobile applications - Security automation and DevSecOps practices - Experience using AI to automate security operations or protect AI-driven systems - Basic experience with software development tools such as Git, dependency management, and build and deployment tools - Knowledge of modern web or mobile applications
- Mercari’s platform is built using modern cloud-native technologies such as GCP, Kubernetes, and Terraform, and is integrated with AI and automation tools. - Work on large-scale, complex security challenges involving the data and systems that support tens of millions of users—an opportunity rarely available elsewhere. - Mercari is pursuing new initiatives such as AI-driven development, zero-trust architecture, and secure-by-design practices, and interns are encouraged to make suggestions, ask questions, and grow. - Experienced security engineers who are passionate about knowledge sharing and developing the next generation of talent will mentor you and support your practical learning and growth. - For those living overseas, visa support and arrangements for airfare and accommodation will be provided.
