Platform Engineer (Infrastructure/Kubernetes & AWS) – HENNGE Platform Team

About HENNGE

HENNGE is a B2B SaaS company based in Tokyo, Japan, and we are at the forefront of the changing workplace. HENNGE One, one of the top cloud security services in Japan, allows customers to adopt flexible work environments and safely harness the power of the cloud from any location. With cloud security ensured, employees are free to focus on working smarter, improving quality, and achieving business results.

Role overview

We are looking for a Platform engineer to take ownership of Internal Developer Platform (IDP) development for powering 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.

In this role, you will join the Platform team, to build,evolve and maintain our Internal Developer Platform leveraging cloud native technologies (Kubernetes) and AWS services. Your mission is to empower our product development teams to build, ship and run their applications securely and efficiently. To succeed in this role, you will bring a strong technical foundation in Kubernetes and AWS.

Tech Stack

Kubernetes (EKS), AWS, ArgoCD, Terraform, Backstage, Kyverno

What you'll do

• Design, develop, and maintain Internal Developer Platform (IDP) using Kubernetes and AWS services
• Contribute to technical discussion to help define the architecture, roadmap and the future direction of the IDP.
• Collaborate with product development teams to seamlessly onboard their product onto the IDP.
• Participate actively in code reviews, discussions and technical decision-making.

What we’re looking for

Minimum Qualifications

• 3 years of experience working with production Kubernetes on cloud, preferably AWS EKS. (Note: please mention the exact years of professional experience with Kubernetes in your cv).
• 3 years of experience building and managing AWS infrastructure with Terraform.
• Hands-on experience with ArgoCD and Kustomize and authoring/deploying Helm charts.
• Experience building and maintaining web application pipelines using GitHub Actions.
• Ability to take technical initiatives, mentor junior engineers, and work collaboratively in a team environment.
• Fluency in English, equivalent to CEFR B2 level or above (e.g., TOEIC 785+).
• Conversational Japanese to coordinate with external vendors (e.g. AWS Japan), cross-functional divisions, and local communities.

While not required, we’d love to hear if you have:

• Degree in Computer Science or related technical field.
• Relevant industry certifications, such as:
  • Certified Kubernetes Administrator (CKA), Certified Kubernetes Application Developer (CKAD), or Certified Cloud Native Platform Engineer (CNPE)
  • AWS Certified Solutions Architect (Associate/Professional) or AWS Certified Security - Specialty
  • HashiCorp Certified: Terraform Associate
• Hands-on experience building custom Kubernetes controllers and implementing policy management tools like Kyverno .
• Experience with Backstage (or similar Internal Developer Portal frameworks)
• Experience setting up and managing observability tools (OpenTelemetry, Grafana / LGTM stack).
• Strong understanding of AWS security best practices.
• Track record of contributing to CNCF open-source projects or speaking at cloud-native tech conferences.
• Strong technical communication and writing skills (runbooks, documentation) to collaborate effectively across Platform and Product teams via code reviews and technical discussions.

Work Style & Employment Details

Work Style
Flexible working hours with a designated core time (11:00–16:00), allowing you to organize your day effectively. Employees typically work 8 hours per day with a 1-hour break.

Employment Type
Permanent employee.

Place of Work
Tokyo, Japan — Shibuya Headquarters. (We will move to Shinjuku starting April 2027)

Compensation

Annual salary: 8 to 10.5 million JPY (includes English Allowance and Physical Communication Bonus)

Benefits

• English Allowance and Advanced Language Expert Allowance: JPY 10,000 ~ JPY 130,000 per month, paid alongside base salary, if the employee fulfills the requirements.
• Physical Communication Bonus: JPY 5,000 per day for coming to the office and interacting with other employees, paid out as bonus according to the number of days. Details will be provided at the offer meeting.
• 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.

Reasons why you will enjoy working at HENNGE

• 🌎 We Celebrate Diversity
  Join a vibrant team from over 30 countries, united by a love for technology and Japanese culture. Located in Shibuya, Tokyo, we offer a dynamic, non-traditional work environment in one of the world's most exciting cities.

• 📍 Smooth Japan Relocation
  We make your move to Japan smooth and stress-free. We provide comprehensive support such as flight tickets, visa sponsorship, and Japanese lessons, to ensure a smooth onboarding process for our new hires, ensuring a seamless transition and a warm welcome for all candidates.

• 🎉 Balanced Work Life
  Work-life balance is highly valued at HENNGE, and lots of fun happens at our office! 200+ of social channels in our Slack, from weekly board game nights to snowboarding club, internal and seasonal events, monthly tech sessions with beer bashes, attendance of international tech conferences, and more. Employees have access to a flexible working hours system (with core working hours) to accommodate their preferred working style.

• ❤ Passion for Technology
  Our CEO has an engineering background and remains deeply engaged in product development. This hands-on understanding of technology helps shape a culture where thoughtful design, technical quality, and continuous improvement are genuinely valued. For engineers, this means working in an environment led by someone who understands the challenges of building products and actively supports teams in doing their best work.

• 🙌 Collaborative Teams
  Work in autonomous teams where your decisions shape our services. Influence every aspect of our products, from UX and architecture to development and deployment, in an agile and collaborative setting.

Be part of a diverse and innovative team at HENNGE, where your passion for technology and desire to make a difference are valued and celebrated.

Ready to change and challenge the status quo with us?

Hiring process

• Solve our online coding challenge
  You will receive an email with our guidance upon your submission, and there is no time limit to finish the challenge.
  Please note that your application will be automatically rejected if you have fewer than 3 years of professional Kubernetes experience.
• Upload your CV and Cover Letter
• Casual interview with our HR
• 2 (or 3) interviews with our engineers (no live coding)
• Final Interview with our CEO

We value your time and want you to perform at your best, so the coding challenge will be the only technical assessment in the process. There will be no live coding sessions.