About HENNGE

Join us at HENNGE, a Tokyo-based cloud-security company with the No. 1 IDaaS revenue share*, helping organizations adopt flexible work environments and safely leverage the cloud. As a B2B SaaS company, we build secure and reliable cloud solutions that help customers manage access and identity efficiently. Our flagship product, HENNGE One, empowers customers with access control, email filtering, archiving, and next-gen cloud security features. What makes us unique: a highly technical CEO, strong engineering culture, and a global mindset. For further details regarding the engineering teams, products, and more, please visit this link: https://speakerdeck.com/hennge/company-introduction-deck-hennge

*No. 1 IDaaS vendor by revenue share, FY2021–FY2025 (forecast), per ITR Market View 2026.

Role overview

We are looking for a Platform Engineer to take ownership of Internal Developer Platform (IDP) development powering HENNGE One, our flagship cloud-security suite used by organizations across a wide range of industries. 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 IDP, 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 (Japanese is not required), equivalent to CEFR B2 level or above (e.g., TOEIC 785+).

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.
Conversational Japanese to coordinate with external vendors (e.g. AWS Japan), cross-functional divisions, and local communities.

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.