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Engineering candidates must start with a coding test. Please email recruit-engineer@hennge.com to receive an entry code and submission instructions. Direct ATS uploads will not be reviewed.

【重要：エージェントの皆様へ】 Greenhouse経由での直接の候補者推薦（CVアップロード）はご遠慮ください。

エンジニア職の選考はコーディングテストから開始いたします。まずは recruit-engineer@hennge.com までご連絡いただき、テスト用のエントリーコードと提出方法の指示を受け取ってください。手順に沿わない直接のアップロードは、選考対象外となる場合がございますので予めご了承ください。

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 Senior Software Engineer to take ownership of backend and web-platform development for HENNGE One, our flagship cloud-security suite used by organizations across a wide range of industries. As a B2B SaaS leader in Japan, we provide mission-critical security solutions that empower customers to work safely from anywhere.

In this role, you will join the Secure Transfer Team, responsible for the development of HENNGE One Data Loss Prevention (DLP) Edition. You will be developing our high-security file exchange solution, which serves as a core component of our product ecosystem. Your mission is to architect scalable and fault-tolerant systems in a distributed cloud deployment to handle and protect sensitive enterprise data. This position requires you to maintain and improve our system architecture leveraging a deep knowledge of AWS and Kubernetes (alongside tools like Terraform), combined with a strong passion for backend application development.

While this role primarily focuses on the DLP Edition, we value engineers who are flexible and open to new challenges, with opportunities to move between teams and products through two-way discussions that support your growth and the company’s goals.

Tech Stack

FastAPI, Kubernetes, ArgoCD, PostgreSQL, AWS

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.

What we’re looking for

Minimum Qualifications

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 pipelines, automated testing, 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+).
Interest in open source or tech community activities.

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

Degree in Computer Science or related technical field.