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 requirementsDesign scalable and fault-tolerant architectures for distributed cloud environmentsBuild and maintain high-quality backend services using PythonEnsure reliable software delivery through CI/CD pipelines, automated testing, and documentationCollaborate closely with Design, Product Management, and Customer Success teams to continuously improve the productParticipate actively in technical discussions and code reviewsMentor junior engineers and contribute to improving team collaboration and engineering practices Technology Stack Python 3asyncioNoSQLAWSDockerCI/CDDistributed systemsCloud infrastructure Requirements Must Have 5+ years of professional experience in Python backend developmentStrong experience building scalable web applications using PythonExperience working with cloud infrastructure such as AWS, GCP, or AzureExperience automating deployments through CI/CD pipelinesStrong understanding of clean code and software documentationAbility to mentor junior engineers and collaborate effectively within a teamProfessional fluency in EnglishInterest in open-source software and technology communitiesExperience in the same or a closely related industry is preferredActive OSS contributions or personal technical projects are highly valuedJapanese is not required. Nice to Have Experience building large-scale distributed systemsStrong experience with AWSExperience with asyncio-based Python web frameworksExperience developing SaaS productsKnowledge of web security concepts, particularly access control or email-related technologiesKnowledge of DevOps practices, including CI/CD and Infrastructure as CodeStrong knowledge of Linux, macOS, or Unix-like environmentsExperience leading an engineering teamDegree in Computer Science or a related technical field Why Join? Work with a diverse engineering team representing more than 10 countriesWork in the heart of Tokyo, in ShibuyaFlexible working hoursHybrid and work-from-home optionsOpportunities to attend international and domestic technology conferencesFinancial support for technical certifications and learning programsRegular technical sessions and knowledge-sharing activitiesCompany events and weekly board game nightsOpportunities to participate in new business contestsA technology-driven environment with strong leadership from a CEO who also serves as CTOComprehensive social insurance and employee benefitsEmployee Stock Ownership PlanA workplace that supports sexual orientation and gender identity Working Conditions Working hours: 10:00 - 19:00Break: 60 minutesHolidays: Saturdays, Sundays, national holidays, and year-end/New Year holidaysTrial period: 3 monthsAnnual salary review: Once per yearTransportation expenses covered according to company policySocial insurance: Health, Employment, Workers' Compensation, and Employees' Pension Insurance Selection Process Online Python coding challengeCasual interview with HR2-3 interviews with engineersFinal interview with the CEO