Common Platform Engineer

The Common Platform Engineer designs, implements, and operates shared platform services used across multiple Loglass products. Working independently from individual product feature teams, the role leads architecture and implementation that preserve product-wide scalability and consistency. The work covers enterprise-scale data volumes, varied business workflows, long-term architecture, and governance that allows each product to remain autonomous.

Development areas include authentication and authorization infrastructure for multi-product use, including SSO and user management; control infrastructure for grouping tenants and products, contract management, and feature controls; and secure integration infrastructure for external services, including machine-to-machine authentication and authorization, limit controls, and IP address restrictions.

The position is part of the Product Platform Team in the Technology Platform Department. The team consists of a development lead who also serves as the product manager for the platform area, an engineering manager, and several engineers. The role works closely with Customer Success and product managers and may also contribute to recruiting activities and technical communication.

Required experience includes designing and implementing internal systems involving service-to-service communication, making technical decisions about non-functional requirements such as performance, availability, fault tolerance, and observability, and developing and operating backend applications. Desired experience includes designing, developing, and operating common platforms; using AI in development work on a daily basis; logical and physical database design and performance tuning; building and operating infrastructure on public clouds such as AWS and GC; and establishing or operating CI/CD and improving development processes and productivity.

The named application technologies are Go, TypeScript, Kotlin, and Rust. The data technologies include PostgreSQL and data lakehouse technologies. Infrastructure tools include AWS, K8s, Argo, and Datadog. AI tools include Claude Code, Codex, and Gemini. Communication tools include Slack, FigJam, and Notion.

This is a permanent full-time position with a three-month probationary period, extendable to six months. Working hours are 10:00 to 19:00 with a one-hour break, under a flextime system with core hours from 10:00 to 15:00. The workplace is the Tokyo headquarters in Mita, Minato-ku; working from home is also available. The possible scope of workplace changes includes locations designated by the company, including a place used for home working.

The stated annual salary range is ¥7,000,000 to ¥20,000,000, determined according to experience and skills. The posting gives monthly examples of ¥584,000 at ¥7,000,000 annually and ¥1,667,000 at ¥20,000,000 annually, each including base salary and fixed overtime pay for 60 hours. Overtime beyond the fixed hours is paid separately. Salary reviews take place twice a year, in April and October. Benefits include company-leased housing, subsidies for computer-related equipment, and a corporate defined-contribution pension plan. Insurance includes health, employees’ pension, employment, and workers’ compensation insurance. Holidays include a two-day weekend system, Saturdays, Sundays, public holidays, and year-end and New Year holidays from December 28 through January 3. Annual paid leave of 10 days is granted at joining, with bereavement, childcare-related nursing, nursing-care, and menstrual leave also provided.