Platform Security Engineer - Mercari

Platform Security Engineer - 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

See here for more information about our mission and values.

Work Responsibilities

As a Security Engineer in the Mercari Platform Security Team, your work will be strengthening the resilience and enhancing the security posture of the foundational platform on which our services are built. This is an important role within Mercari that involves executing impactful projects across the organization. Through these projects, you will help ensure the integration of and compliance with security best practices, frameworks, and regulations across the Mercari platform.

Mercari follows the philosophy of “security as code”, so our security engineers are expected to automate and optimize the solutions they develop to provide a secure-by-default platform to other engineers. That’s why we are looking for people passionate about automation to join our team! Specifically, you will:

• Automate security controls and monitoring.
• Develop technical solutions to prevent or mitigate security vulnerabilities and strengthen overall system security.
• Maintain technical & security standards for production and corporate infrastructure services.
• Collaborate with security management professionals, the legal team, and internal auditors on technical security matters.
• Work with platform engineering teams to balance security with other requirements.
• Review architecture proposals, such as infrastructure or information flows, and propose security controls to minimize risks.

Unique Challenges

• Security Engineers at Mercari are responsible for dealing with a vast array of data, logs, and dependencies. You will be able to use cutting-edge and complex cloud infrastructure systems to help us identify and address issues.
• With rapidly growing organizations and services, it is extremely important for Mercari to introduce automation and stop depending on manual work as much as possible. This is an exciting opportunity to gain experience helping us build our security systems and solve issues in a fast-paced environment.

Qualifications

• Required Experience/Skills
• Strong understanding of core computer security concepts and the ability to explain and apply them, including the CIA triad, principle of least privilege, authentication vs. authorization, cryptography, security protocols, application security, and related topics.
• Experience with standard software development tools such as Git, GitHub, CI/CD tools (GitHub Actions), and shell scripting
• Programming experience with one or more programming languages including but not limited to Go, Python or TypeScript
• Experience using and configuring public cloud infrastructure platforms (GCP, Google Workspace, AWS, Azure), as well as container technologies (Docker, Kubernetes) and Infrastructure as Code (Terraform)
• Experience with UNIX-like systems (i.e. Linux, macOS) configuration, administration and hardening as well as knowledge of basic POSIX command line utilities
• Preferred Experience/Skills
• 4+ years of experience in security domains
• Bachelor's degree in Computer Science or equivalent practical experience
• Familiarity with cloud and web application architecture and best practices
• Familiarity with secure software development lifecycle (Secure SDLC, SLSA).
• Knowledge of SQL (BigQuery, Postgres, etc)
• Familiarity with applied cryptography (key management, TLS, PKIs, KMSes, etc)
• Familiarity with networking - TCP/UDP, DNS, HTTP
• Experience with configuring identity federation (OIDC, SAML)
• Familiarity with PCI-DSS or other information security or privacy standards
• Language
• Either Japanese orEnglish: Independent (CEFR - B2)
  For details about CEFR, see here.

Learn More About Mercari Group

• Careers site:
• Mercan:
• 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
• 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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