Backend Engineer

Senior Software Engineer (Python)

Location: Tokyo, Japan

Work Style: Hybrid / Remote Work Available

Salary: ¥8,500,000 - ¥12,500,000 per year

Employment Type: Permanent / Full-time

About the Company

Our client is a leading cloud-based security provider in Japan, delivering an additional layer of security for companies operating in the cloud.

With more than 70% market share in Japan's cloud security services targeting Microsoft 365 and Google Workspace, the company is experiencing rapid growth and is listed on the Tokyo Stock Exchange.

The engineering team builds cloud security solutions used by thousands of enterprise customers. Its flagship product provides a wide range of security capabilities, including access control, email filtering, online storage, and email archiving.

The company places a strong emphasis on state-of-the-art security technologies, highly available distributed systems with a 99.9% SLA, and delivering an excellent customer experience.

About the Role

We are looking for a Senior Software Engineer specializing in Python to join a fast-growing engineering team.

You will be involved in designing and developing scalable cloud-based security solutions, working on innovative product features while contributing to the architecture, reliability, and overall quality of the platform.

This role is well suited to an experienced Python backend engineer who enjoys working with distributed systems, cloud technologies, and modern software engineering practices.

Responsibilities

• Design, develop, and maintain innovative product features based on business requirements
• Design scalable and fault-tolerant architectures for distributed cloud environments
• Build and maintain high-quality backend services using Python
• Ensure reliable software delivery through CI/CD pipelines, automated testing, and documentation
• Collaborate closely with Design, Product Management, and Customer Success teams to continuously improve the product
• Participate actively in technical discussions and code reviews
• Mentor junior engineers and contribute to improving team collaboration and engineering practices

Technology Stack

• Python 3
• asyncio
• NoSQL
• AWS
• Docker
• CI/CD
• Distributed systems
• Cloud infrastructure

Requirements

Must Have

• 5+ years of professional experience in Python backend development
• Strong experience building scalable web applications using Python
• Experience working with cloud infrastructure such as AWS, GCP, or Azure
• Experience automating deployments through CI/CD pipelines
• Strong understanding of clean code and software documentation
• Ability to mentor junior engineers and collaborate effectively within a team
• Professional fluency in English
• Interest in open-source software and technology communities
• Experience in the same or a closely related industry is preferred
• Active OSS contributions or personal technical projects are highly valued
• Japanese is not required.

Nice to Have

• Experience building large-scale distributed systems
• Strong experience with AWS
• Experience with asyncio-based Python web frameworks
• Experience developing SaaS products
• Knowledge of web security concepts, particularly access control or email-related technologies
• Knowledge of DevOps practices, including CI/CD and Infrastructure as Code
• Strong knowledge of Linux, macOS, or Unix-like environments
• Experience leading an engineering team
• Degree in Computer Science or a related technical field

Why Join?

• Work with a diverse engineering team representing more than 10 countries
• Work in the heart of Tokyo, in Shibuya
• Flexible working hours
• Hybrid and work-from-home options
• Opportunities to attend international and domestic technology conferences
• Financial support for technical certifications and learning programs
• Regular technical sessions and knowledge-sharing activities
• Company events and weekly board game nights
• Opportunities to participate in new business contests
• A technology-driven environment with strong leadership from a CEO who also serves as CTO
• Comprehensive social insurance and employee benefits
• Employee Stock Ownership Plan
• A workplace that supports sexual orientation and gender identity

Working Conditions

• Working hours: 10:00 - 19:00
• Break: 60 minutes
• Holidays: Saturdays, Sundays, national holidays, and year-end/New Year holidays
• Trial period: 3 months
• Annual salary review: Once per year
• Transportation expenses covered according to company policy
• Social insurance: Health, Employment, Workers' Compensation, and Employees' Pension Insurance

Selection Process

1. Online Python coding challenge
2. Casual interview with HR
3. 2-3 interviews with engineers
4. Final interview with the CEO