Security Engineer, New Graduate

Mercari, Inc.

. Review security designs and processes .

Posted 11/5/2026full-timeMinato City • JapanEntry LevelWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates foundational knowledge in cybersecurity principles, programming languages such as Go, Python, PHP, or JavaScript, and basic familiarity with Linux and SQL. Capable of contributing to security processes, conducting penetration tests, and developing automation scripts for security compliance.

Highest-signal resume keywords

Programming Experience With Go, Python, PHP, Or JavaScriptBasic Familiarity With LinuxFoundational Knowledge Of SQLInterest In Cybersecurity And EngineeringParticipation In Security Conferences Or CTF Competitions

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Penetration TestingSecurity Design ReviewAutomation ScriptingThreat ModelingVulnerability RemediationLog AnalysisSecurity TestingCode ReviewCompliance ChecksAI Security Best Practices

Soft Skills

Effective Interpersonal SkillsCommunication Skills

Tools & Technologies

DockerKubernetesGCPAWSAzureGitDevSecOpsSecurity AutomationBuild And Deployment ToolsModern Web Or Mobile Applications

Industry Keywords

CybersecuritySecurity PlaybooksAsset Inventory ReconciliationSecurity ResearchAI-Driven System ProtectionBug Bounty ProgramsWeb Application Security TestingMobile Application Security TestingPolicy ViolationsDetection Rules

Tech Stack

Tools & technologies

AWSAzureCloudCyber SecurityDockerGoogle Cloud PlatformJavaScriptKubernetesLinuxPHPPythonSQLGo

About the role

Key responsibilities & impact

Review security designs and processes
Develop and deploy security countermeasures
Conduct penetration tests
Participate in threat modeling, code reviews, and security testing under senior engineer guidance
Develop or enhance automation scripts for compliance checks, asset inventory reconciliation, and alerting
Conduct supervised security research and propose actionable improvements
Help triage security findings, verify issues, and coordinate vulnerability remediation with developers
Contribute to secure development guidelines, AI security best practices, security playbooks, and onboarding documentation
Analyze logs to detect anomalies, tune detection rules, and track misconfigurations or policy violations
Work across threat detection and response, platform security, product security, and enterprise security teams

Requirements

What you’ll need

Target applicants able to join as new graduates in October 2027 or April 2028
Candidates are generally expected to participate in an internship before applying for the full-time position; candidates unable to participate due to personal circumstances may apply through this posting
Shared understanding and belief in Mercari’s mission and values
Strong interest in cybersecurity and engineering
Programming experience with one or more programming languages, including Go, Python, PHP, or JavaScript
Enrolled in a Bachelor's degree or higher program or technical school in Computer Science, Information Security, or another engineering-focused major
Effective interpersonal and communication skills
Basic familiarity with Linux, including common commands and scripting
Foundational knowledge of SQL and data querying
English or Japanese at Independent level (CEFR-B2)
Preferred: Basic understanding or strong interest in security conferences, CTF competitions, bug bounty programs, penetration testing, web or mobile application security testing, public cloud platforms (GCP, AWS, or Azure), Docker, Kubernetes, security automation, DevSecOps, AI security operations automation, AI-driven system protection, Git, dependency management, build and deployment tools, and modern web or mobile applications

Benefits

Comp & perks

Mentorship and collaboration with experienced security engineers
Exposure to cutting-edge cloud-native technologies including GCP, Kubernetes, and Terraform
Opportunity to work with systems supporting tens of millions of users
Opportunities to contribute to AI-driven development, zero trust architecture, and secure-by-design initiatives
Guidance and knowledge sharing from experienced security engineers
Permanent employment status as a new graduate