Senior Backend Software Engineer

The ARM Group is hiring for a “Software Engineer – Backend” with one of our clients in Tokyo, Japan

In this role, you will contribute to the development and enhancement of our Warehouse Management System (WMS) and its companion Handy Terminal device — both key products within our advanced logistics technology suite. These systems are built to seamlessly integrate with our cutting-edge ASRS solutions, driving operational efficiency across modern warehouses.

You will play a crucial part in designing and maintaining a scalable, high-performance backend architecture used across multiple deployments. We value strong technical expertise, collaboration, and a proactive approach to engineering challenges.

• Design, develop, and maintain backend components that optimize supply chain and warehouse operations
• Improve code quality through enhanced testing, automation, and best engineering practices
• Collaborate with cross-functional development teams to deliver integrated and effective solutions

• 3–5 years of professional experience working with Python (3.10 or above)
• Hands-on experience with modern backend frameworks such as FastAPI or Django
• Solid understanding of SQL and database design, ideally with PostgreSQL
• Proficiency in testing and automation tools (pytest, GitHub Actions, Docker)
  

• Experience working with NoSQL technologies (e.g., Redis)
• Familiarity with asynchronous development (asyncio) or messaging systems
• Strong ability to articulate and justify technical decisions
• Experience presenting at engineering events or contributing to open-source projects
• Knowledge of logistics, WMS workflows, or supply chain systems
  

• A problem-solver driven by delivering meaningful results
• Someone who values thoughtful API design and robust system architecture
• A team player who collaborates effectively and understands the bigger picture
• A proactive engineer who identifies issues early and ensures smooth production performance
  

• Competitive salary and performance-driven growth opportunities
• Work with a globally diverse and talented engineering team
• Comprehensive visa sponsorship and relocation support to Japan
• Opportunity to contribute to impactful technology in a rapidly evolving logistics sector

Disclaimer:

ARM GROUP is committed to building a diverse and inclusive workplace. We are an equal-opportunity employer, and all qualified applicants will receive consideration for employment regardless of race, ethnicity, nationality, religion, gender, gender identity, sexual orientation, age, disability, veteran status, or any other legally protected characteristic under applicable Japanese law.

We particularly welcome applications from individuals of diverse backgrounds, including those with disabilities. Reasonable accommodations are available upon request for applicants participating in any part of the selection process.

By submitting your application, you consent to allow representatives of ARM GROUP LLC to contact you regarding this opportunity — via email, phone, text, or other communication methods deemed appropriate by ARM GROUP LLC — strictly for recruitment purposes. All personal information will be handled with confidentiality and used solely in connection with this hiring process.

Please note that ARM GROUP LLC serves as a recruitment partner sourcing candidates on behalf of a client company in Tokyo, Japan. The final decision to hire or decline a candidate rests solely with the client organization with which we have an agreement.

This job description is not intended to be an exhaustive list of all duties, responsibilities, or working conditions associated with the role. These may evolve or change at the discretion of the client, with or without notice.

All prospective employees must meet legal eligibility requirements to work in Japan. Employment may be contingent on verification of identity, work authorization (including visa status, if applicable), and completion of background checks or other screening procedures as required by the client.