Mercari, inc.
Internet
SecurityEngineerInternship
Neural analysis suggests this role is
optimal for Entry candidates.
“Security Engineer Internship at Mercari, inc.. Skills: Security design, Process reviews, Security countermeasures development and deployment, Penetration tests, Threat modeling, Security automation, Web and mobile application security testing, Monitoring and log analysis, Vulnerability management. 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 f”
What You'll Achieve.
Identify and reduce risk in Mercari’s systems.; Propose actionable improvements for Mercari.; Help us build out our security systems and solve interesting challenges.
Industry & Context.
Solve Through Mechanisms; Tackling complex security and infrastructure problems; Help us build out our security systems and solve interesting challenges in a fast-paced environment.
Must be able to stay in Japan, Visa support and accommodation arrangements provided for overseas candidates, Internship must be from within Japan
What They're Looking For.
Must Have
Shared understanding and belief in our company’s mission and values, interest in cybersecurity and engineering, Availability to work 20+ hours per week for a period of 2–3 months, 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
Nice to Have
Basic understanding or 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, 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
What You'll Do.
Participate in threat modeling
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
Conduct focused security research on a supervised topic (e.g.
summarize key findings
and propose actionable improvements for Mercari.
Support vulnerability management processes by helping triage security findings
and coordinate with developers on remediation efforts.
Contribute to internal documentation
including secure development guidelines
AI security best practices
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.
How You'll Work.
Team & Collaboration
Collaborate openly; Coordinate with developers on remediation efforts; Work with experienced security engineers who are passionate about sharing knowledge and building the next generation of talent.; Team members are encouraged to contribute, ask questions, and grow.
Communication Scope
Effective interpersonal and communication skills; Independent (CEFR-B2) English or Japanese
Process & Methodology
Technical project management
Full Job Description
### JD in Japanese follows. 英文の後に和文JDをご覧いただけます。 ### Security Engineer – Mercari (Internship) * Target Applicants: Those who can join as new graduates in October 2027 or April 2028. * Employment Status: Intern * Please apply only if you are able to stay in Japan, as the internship must be from within Japan. * For those who live overseas, we will provide Visa support and accommodation arrangements. * Regarding the arrangement of airline tickets, this applies only to those who have not purchased tickets at the time of the internship offer. * Work Hours: Able to work more than 20 hours per week 2-3 months of Internship is encouraged. * Office: in Japan (Remote or Roppongi) * Application Deadline: August 31, 2026, 23:59 (JST) * For more details, see the [Overview of Our Positions](https://careers.mercari.com/en/recruitment-selection/#section3) 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](https://careers.mercari.com/en/culture/). ### Organization/Team Mission This internship 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 students aiming to become future product leaders, this internship offers the opportunity to take on challenges from both business growth
Applying for this Security Engineer Internship role?
Most applicants get filtered before a human reads their resume. See if yours makes the cut.
ANONYMOUS · UNFILTERED
What do employees actually say about Mercari, inc.?
Real rants from real employees. Read before you apply.