Web Application Engineer

This open-position role leads product development for existing products such as Loglass Management and Loglass Workforce Planning, as well as new products. The work starts with hearing about customer operations and using that understanding for modeling and design. Responsibilities include developing new features, improving existing features, routine refactoring, leading projects within the development team, and accelerating, streamlining, and automating development workflows.

The engineer will also lead the design and implementation of features and new services that combine LLMs or generative AI with web technologies. Other responsibilities include technology selection, system design, code reviews, performance optimization, technical decision-making, mentoring team members, and planning development initiatives with engineering managers. Contributions to technical culture include internal study sessions, technical blog posts, and conference presentations.

Required experience includes leading and advancing technical decisions that affect organizations larger than the immediate team; deriving technology strategy from business or corporate strategy; improving team productivity through process improvement, enablement, and automation; approximately five or more years of server-side web application development experience; and approximately three or more years of test design and test-code development. Experience refactoring or re-architecting legacy or large-scale systems and working with an agile development process are also required.

Experience with frontend development may be useful because the position is primarily server-side but may include some frontend work. The posting also identifies Java, Go, and TypeScript; TDD and DDD; performance-focused coding; production design and operation of products incorporating LLMs or generative AI; and leadership of architecture design and operation using cloud platforms such as AWS or GCP as desired experience.

The product domain is corporate management and budget-versus-actuals management. Because management methods differ between companies and lack a single standard format, the role addresses complex digitalization problems and may explore adjacent business issues and use cases for new products. Possible future career directions stated in the posting include technical lead, engineering manager, and head of product development.

The main development tools are Kotlin, Spring Boot, Go, Rust, React, Next.js, TypeScript, AWS, Terraform, Fargate, ECR, Aurora PostgreSQL, Datadog Synthetics, and Playwright. Other listed tools and services include Slack, Gather, Figma, Findy team＋, Notion, diagrams.net, Cursor, Claude Code, and Gemini 3.

The position is full-time with a three-month probationary period, extendable to six months. Annual compensation is 7.0 to 20.0 million JPY, determined according to experience and skills, with salary reviews twice a year in April and October under company rules. Work is at the Tokyo office in Minato, with remote work available. Hours are 10:00–19:00 with a one-hour break, and a flextime system with core hours from 10:00 to 15:00. Holidays include weekends, public holidays, and the year-end and New Year period from December 28 through January 3. Benefits include company-leased housing, support for PC-related equipment, and a corporate defined-contribution plan. Insurance includes health, employees’ pension, employment, and workers’ compensation insurance.