Senior Software Engineer - Backend/​Cloud Security (Remote)

About the Role

We are looking for a Senior Software Engineer - Backend/Cloud Security to take ownership of backend and web-platform development for HENNGE One, our flagship cloud-security suite serving over 2.8 million users globally. As a B2B SaaS leader in Japan, we provide mission-critical security solutions that empower enterprises to work safely from anywhere. This Senior Software Engineer remote position is ideal for engineers who want to bridge the gap between advanced backend development and deep cloud infrastructure, utilizing tools like Kubernetes and Terraform to ensure data integrity.

What You'll Do

• Design, build, and maintain new features for HENNGE One, using Python and other web technologies.
• Architect scalable, fault-tolerant services deployed in cloud environments.
• Automate deployment, testing, monitoring, and documentation via CI/CD pipelines and infrastructure-as-code.
• Collaborate closely with Product Management, Design, and Customer Success teams to deliver high-quality user experiences.
• Participate actively in code reviews, discussions, and technical decision-making.
• Mentor junior engineers and contribute to improving team processes and engineering culture.

Requirements

• 3+ years of experience developing production-scale web applications using Python.
• Strong experience across the software development lifecycle (SDLC), from system design to deployment and maintenance.
• Hands-on experience with containerization and orchestration technologies (e.g., Kubernetes, ArgoCD).
• Experience with Infrastructure-as-Code tools, such as Terraform.
• Deep expertise in architecting and operating mission-critical AWS environments.
• Experience with CI/CD, automated testing, code documentation, and clean-code practices.
• Ability to lead technical initiatives, mentor junior engineers, and work collaboratively in a team environment.
• Fluency in English (Japanese is not required), equivalent to CEFR B2 level or above (e.g., TOEIC 785+).

Nice to Have

• Degree in Computer Science or other related technical fields.
• Experience building large-scale distributed systems or SaaS products in the B2B space.
• Familiarity with Go, or a strong interest in learning it, to help build and maintain our multi-language backend infrastructure.
• Additional experience with cloud security best practices, including PII obfuscation and secure data-handling protocols.

What We Offer

• Flexible working hours with a designated core time (11:00-16:00), allowing you to organize your day effectively.
• Annual salary: JPY 8.5M to 12.5M (approximately $80,000 to $120,000 USD).
• English Allowance and Advanced Language Expert Allowance: JPY 10,000 ~ JPY 130,000 per month.
• Physical Communication Bonus: JPY 4,000 per day for coming to the office.
• Transportation allowance (maximum of JPY 35,000 per month).
• Employee Stock Ownership Plan.
• Insurance: Health, Employment, Industrial Injury, Welfare pension.
• Opportunities to attend international and domestic conferences.
• Financial support for technical certifications and technical learning programs.

Join a vibrant team from over 20 countries, united by a love for technology and Japanese culture. We celebrate diversity and offer a dynamic, non-traditional work environment in one of the world's most exciting cities. If you are ready to change and challenge the status quo with us, apply now for this Senior Software Engineer remote position!