Security Engineer ensuring Mercari products meet security standards and assisting with security issues in Tokyo. Involved in threat modeling, security testing, and system vulnerabilities.
Responsibilities
Review product designs to define necessary security requirements based on threat modeling.
Review proposed architectures and propose a set of security controls in order to minimize risk.
Review source code to find security problems and potential vulnerabilities.
Conduct vulnerability assessments and penetration testing on Mercari’s Backend, Web, iOS, and Android applications.
Automate security checks and tests so that they can be easily and transparently plugged into the CI/CD pipeline.
Develop technical solutions to help mitigate security vulnerabilities.
Maintain technical and security standards for Web and mobile application technologies.
Educate developers on secure coding practices with workshops, talks, and lessons.
Evaluate and investigate suspected security events or incidents and perform remediation in accordance with Incident Response procedures.
Collaborate with information security officers, the legal team, and internal auditors on technical security matters.
Requirements
Bachelor's degree or equivalent practical experience.
Programming experience with one or more programming languages including but not limited to: Go, PHP, Java, Ruby, Python, Swift, Kotlin, or JavaScript.
4+ years of experience analyzing the security of systems (penetration testing, Web application security testing, vulnerability scanning, threat modeling, etc.).
Good understanding of modern Web application architecture, TLS, HTTP, TCP/IP, and standard network and system security technologies.
Experience with modern software development tools, such as distributed version control systems (git), dependency management, build systems, and CI/CD pipelines.
Strong teamwork skills in a diverse environment.
Effective interpersonal and communication skills.
In-depth technical knowledge of security engineering, computer and network security, Unix-based operating systems, mobile security, authentication, security protocols, and applied cryptography.
Strong experience in securing both backend (Go, PHP) and frontend (Web, JavaScript, iOS, Android) applications with the ability to adopt new frameworks and technologies quickly.
Good understanding of development methodologies such as Object-oriented Programming (OOP), Domain-driven Design (DDD), and Test-driven Development (TDD).
Good understanding of microservice architecture and related security patterns.
Good understanding of the inner workings of OAuth2 and OIDC implementations.
Knowledge of container and orchestration technology like Docker and Kubernetes.
Experience working with large-scale cloud infrastructure and services (GCP or AWS).
Experience with securing large-scale cloud infrastructure through analyzing CSPM alerts from tools such as Wiz.
Experience working in an agile and DevOps-centric environment.
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