仕事内容
We are a global leading company providing Professional AI — products that combine deep domain expertise with advanced AI. Since our founding in 2017, we have focused on developing AI-powered legal technology, raising a total of approximately JPY 28.6 billion to date. In 2022, we established our U.S. entity, and in 2025, we accelerated our global expansion further through our first M&A, welcoming Germany-based Fides Technology into our group. Our flagship product, LegalOn, is currently available in Japan, the United States, and the United Kingdom. In September 2025, just six and a half years after launch, LegalOn surpassed JPY 10 billion in ARR. Beyond legal, we are expanding into other highly specialized domains with products such as WorkOn, DealOn, and GovernOn, leveraging AI to support complex professional work. Through our strategic partnership with OpenAI, we incorporate cutting-edge technologies such as AI agents into our product development. By delivering solutions that address a wide range of business challenges, we empower our customers to achieve better outcomes. For more details about our company, products, and development organization: https://legalforce-recruit.notion.site/LegalOn-Technologies-Candidate-Handbook-17d82a58637480d2836ae138e5b5ee95 Mission and Challenges
As a Software Engineer for our global product, "LegalOn", you will build the "Legal Success Platform" to support a wide range of corporate legal operations (contracts, governance, research, internal Q&A, etc.) through new feature development and ongoing maintenance. You will actively engage in solving challenges that arise while shaping "LegalOn" - an unprecedented product -, going beyond technical domains to drive customer value creation.
What You’ll Do
Evolve the "Legal Success Platform" by developing new features and continuously improving "LegalOn" Construct and refine development workflows centered on AI Identify peripheral challenges necessary for creating customer value and address issues beyond your assigned domain Drive continuous improvements to enhance quality, maintainability, operability, and productivity
Development Environment / Tools Backend: Go, Python, TypeScript, Java Frontend: TypeScript, React For additional details, please refer to this notion page: https://legalforce-recruit.notion.site/LegalOn-Technologies-f5ebe38a6009428ab0fb1714efd3c90a
Required Skills / Qualifications
5+ years of experience in web application development 3+ years of experience in either web frontend or backend development 6+ months of experience in development using AI Agents Experience in development premised on the operation of automated testing Experience in asynchronous team development using distributed platforms such as Git and GitHub Fluent communication skills in Japanese (both online and offline)
Alternatively, candidates with N2-level equivalent Japanese proficiency and fluent English communication skills (both online and offline) are also welcome
Preferred Skills / Qualifications
Practical experience with Harness / Prompt Engineering Experience in building workflows centered on AI Experience in operating and maintaining a single product for 3+ years as a Lead Engineer or Architect Experience in roles specializing in infrastructure, such as Platform Engineering or SRE Experience in product development roles other than software engineering, such as PdM, UI Design, or EM Experience in developing multi-region products Experience in development within multinational teams
8.2million to 15 million yen per year
19F, Shibuya Sakura Stage SHIBUYA TOWER, 1-1 Sakuragaoka-cho, Shibuya-ku, Tokyo 150-6219, Japan This is not a fully remote position for overseas candidates. You will be required to work in Japan, and visa support is available.
Full-time
Working hours: Full flex system without core hours It may be required to work overtime Break time: 1 hour
3 months
Work Environment & Tools
Choice of laptop: Mac or Windows (Mac with US keyboard available) Access to generative AI tools: Notion AI, Gemini for Google Workspace, Slack AI Access to developer tools: Claude Code, Cursor, GitHub Copilot, Devin, Codex, Figma AI, and more Side jobs permitted with prior approval
Professional Development
Self-development support available for books, online courses, certifications, and more Language learning support
Time Off
Weekends and national holidays off Paid leave and year-end/New Year holidays Special leave: sick leave, work-life balance leave, birthday leave Maternity leave, childcare leave, and nursing care leave
Health & Welfare
Social insurance coverage: Health insurance, employee pension insurance, unemployment insurance, and worker’s compensation insurance Influenza vaccination support No indoor smoking (a designated smoking room is available in the building) Employee stock ownership program Certified as an “Eruboshi” company (recognized for promoting women’s participation and advancement in the workplace)
会社名: 株式会社LegalOn Technologies
設立: 2017年4月
所在地: 東京都渋谷区桜丘町1-1 渋谷サクラステージSHIBUYAタワー19階
201.5億円（資本準備金等含）
約632名（役員含む／2026年4月時点）