Job Description

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Software Engineer (Security) in Japan.

In this role, you will design, develop, and maintain advanced security features for large-scale web platforms, ensuring resilience against emerging threats and protecting sensitive data. You will work closely with engineering and product teams to implement secure software practices, perform thorough testing, and contribute to the overall security architecture. This position offers the opportunity to influence the security posture of a widely used platform, participate in cross-functional projects, and mentor team members on secure coding and best practices. Operating in a remote-first, globally distributed team, you will balance technical innovation with operational excellence while fostering a collaborative and transparent engineering culture.

Accountabilities:

• Design, develop, and deliver security features and enhancements for web platforms
• Collaborate with other engineering teams to ensure safe architectural and implementation decisions
• Lead by example in code review, decision-making, and team culture, fostering transparency, empathy, and collaboration
• Develop, review, and deploy security solutions implemented by the team and community contributors
• Maintain security-critical components, address technical debt, and perform security maintenance
• Provide support during application security incidents and operational challenges
• Mentor and guide less experienced engineers on secure development practices

Requirements:

• 5+ years of experience as a software engineer, with a focus on security
• Proficiency in PHP and JavaScript and experience working in modern codebases
• Strong understanding of secure software development, threat modeling, and application-level vulnerabilities
• Ability to break down complex projects into actionable tasks and create proofs of concept
• Experience explaining security issues, privacy risks, and mitigation strategies to non-technical stakeholders
• Comfort working in a remote, distributed team environment
• Nice-to-have: experience with bot detection, CAPTCHA, security countermeasures, MediaWiki, open-source contributions, and secure design patterns

Benefits:

• Competitive, location-adjusted compensation
• Flexible remote work environment
• Opportunities for professional growth and learning specialist security skills
• Inclusive and diverse workplace culture
• Supportive resources for personal and professional development

Why Apply Through Jobgether?

We use an AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team.

We appreciate your interest and wish you the best!

Data Privacy Notice: By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time.

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We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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