Senior Backend Engineer (Python) | Design Large-Scale Data Platforms

Our client is an innovative technology company building large-scale digital platforms that process and distribute rapidly growing datasets to customers around the world. The organization combines strong engineering practices with a mission-driven culture, offering engineers the opportunity to work on highly scalable systems, modern cloud technologies, and challenging technical problems in a collaborative international environment. Employees are encouraged to take ownership, contribute to architectural decisions, and continuously improve both products and engineering processes.We are seeking an experienced Senior Backend Engineer to help design, build, and evolve the backend systems that support a rapidly growing global data platform. This position focuses on system architecture, backend development, API design, database engineering, and cloud-based distributed systems. The successful candidate will work closely with cross-functional teams to deliver scalable, reliable, and secure solutions while contributing to technical strategy and long-term platform growth. Responsibilities・ Design and develop scalable backend architectures for data-intensive web applications・ Build and maintain APIs supporting data discovery, management, and delivery workflows・ Design secure and reliable integrations with internal and external systems・ Optimize database structures, performance, and data processing workflows・ Collaborate with software engineers, product teams, and stakeholders to deliver high-quality solutions・ Improve system reliability through testing, monitoring, and engineering best practices・ Participate in architectural discussions and technical decision-making Requirements ・ Strong professional software development experience using Python・ Experience building web applications and backend services・ Experience with PostgreSQL or other relational databases・ Knowledge of software testing and qualityassurance methodologies・ Experience designing APIs and distributed systems・ Business-level English communication skills Preferred Skills・ GraphQL experience・ Cloud-native application development experience・ Container technologies such as Docker and Kubernetes・ Serverless architecture experience・ Database optimization and performance tuning・ AWS experience, including messaging and event-driven architectures・ Technical leadership or mentoring experience What We Offer ・ Flexible working environment・ Remote work options・ Opportunity to influence architecture and technology decisions・ International team environment・ Exposure to large-scale data platforms and modern cloud technologies・ Strong learning and professional development support SalaryJPY 6,000,000 - 9,000,000 depending on experience and skills.・ Passionate about solving complex technical challenges・ Strong interest in scalable system design and software architecture・ Self-motivated and capable of taking ownership・ Comfortable working in an international environment・ Excellent problem-solving and communication skills・ Eager to learn and continuously improve