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Job Application for Senior Software Engineer (Backend/Infrastructure) - HENNGE Secure Transfer at HENNGE Careers

Salary: 850 - 1250 百万円

KubernetesAWSGoPython
English: Fluent

Minimum year of experience: 3

HENNGE

Senior Software Engineer (Backend/Infrastructure) – Secure Transfer

Location: Tokyo, Japan
Work Style: Flexible (core time 11:00–16:00)
Employment Type: Permanent
Compensation: 8.5–12.5 million JPY/year (including language and communication bonuses)

Role Overview

Join the Secure Transfer Team as a Senior Software Engineer, focusing on backend and web-platform development for a flagship cloud-security suite serving millions of enterprise users worldwide. In this role, you’ll architect fault-tolerant, high-availability systems designed to handle and protect sensitive enterprise data. This is an ideal position for engineers passionate about bridging advanced backend development and deep cloud infrastructure, especially with Kubernetes and Terraform.

Opportunities exist to move between teams and products in support of both your individual growth and business needs through collaborative discussion.

Tech Stack:

  • FastAPI
  • Kubernetes
  • ArgoCD
  • PostgreSQL
  • AWS

What You’ll Do

  • Design, build, and maintain new features using Python and modern web technologies
  • Architect and operate scalable, fault-tolerant services deployed in the cloud
  • Automate deployment, testing, monitoring, and documentation via CI/CD and infrastructure-as-code
  • Collaborate with Product, Design, and Customer Success teams to launch high-quality features
  • Participate in code reviews and technical discussions
  • Mentor junior engineers and contribute to engineering culture

What We’re Looking For

Minimum Qualifications

  • 3+ years of experience developing production-scale web applications with Python
  • Strong experience across SDLC, from design to deployment/maintenance
  • Hands-on experience with containerization/orchestration (e.g., Kubernetes, ArgoCD)
  • Experience with Infrastructure-as-Code tools (e.g., Terraform)
  • Expertise in architecting/operating mission-critical AWS environments
  • Familiarity with CI/CD, automated testing, and clean code
  • Ability to lead technical initiatives and mentor teammates
  • Fluent English (CEFR B2+, e.g., TOEIC 785+)
  • Interest in open source or tech community activities

Preferred (Not Required)

  • Degree in Computer Science or related field
  • Experience with large-scale distributed systems or SaaS products
  • Familiarity with Go or strong interest in it
  • Additional experience in cloud security best practices (e.g., data obfuscation)
  • Team leadership skills

Work Style & Location

  • Flexible hours (core time 11:00–16:00, standard 8-hour day)
  • Work location: Shibuya, Tokyo, Japan

Compensation & Benefits

  • Annual salary: 8.5–12.5 million JPY
  • English and Advanced Language Allowances: JPY 10,000–130,000/month, depending on proficiency
  • Physical Communication Bonus: JPY 4,000/day for office attendance and interaction
  • Transportation allowance (max JPY 35,000/month)
  • Employee Stock Ownership Plan
  • Comprehensive insurance (Health, Employment, Industrial Injury, Welfare Pension)
  • Conference attendance (domestic/international)
  • Support for technical certifications and continuous learning

Reasons to Join

  • Diversity: Over 20 countries represented in a vibrant, collaborative environment
  • Smooth Relocation: Full support with relocation, including flight, visa, and Japanese lessons
  • Work-Life Balance: Flexible hours, dynamic office life, social events, and tech sessions
  • Engineering-Driven Culture: Technology-focused leadership, continuous improvement, and a collaborative decision-making environment
  • Influence & Autonomy: Autonomously shape products and services in agile teams

Further reading:

Hiring Process

  1. Online coding challenge (in Python, no time limit)
    • Note: Only Python submissions accepted; <3 years Python experience results in automatic rejection
  2. Upload CV and Cover Letter (check cover letter guide)
  3. Casual interview with HR
  4. 2-3 interviews with engineers (no live coding)
  5. Interview with CEO

Only the coding challenge is a technical assessment—no live coding during interviews.

Be part of a diverse, innovative team where your technical expertise and passion truly matter. Challenge the status quo and grow in a collaborative environment!

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