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LegalOn Technologies is a global leader in legal AI solutions, trusted by more than 8,000 companies and law firms worldwide. The company empowers legal teams to review and negotiate contracts faster, with greater accuracy and confidence. Operating across Japan, the United States, and Europe, LegalOn is the first AI company from Japan to surpass ¥10 billion in annual recurring revenue (ARR) and has raised over $200M from leading investors including SoftBank and Goldman Sachs. It also has one of the largest and most global AI teams of any startups in Japan. In 2025, LegalOn achieved its first M&A by welcoming Germany's Fides Technology into the group, further accelerating global expansion. LegalOn combines LLMs, intelligent Agents and intelligent AI-driven workflows. Beyond legal, the company now offers specialized AI solutions including "CorporateOn," "CXOn," and "DealOn" to support diverse business domains requiring high expertise. In partnership with OpenAI, the company is redefining the legal AI landscape and developing innovative solutions for the future of professional work. For more details about our company, products, and development organization: https://legalforce-recruit.notion.site/LegalOn-Technologies-Candidate-Handbook-17d82a58637480d2836ae138e5b5ee95 Key Responsibilities The Search and Recommendation group at LegalOn Technologies is responsible for a wide range of search, recommendation and agentic features in multiple rapid-growth services. LegalOn Technologies is a leading company of LegalTech in Japan, and Search and Recommendation is one of the most essential and mission-critical systems for our services. We are looking for a skilled Software Engineer passionate about technology to design and implement various search/recommendation features and solve complex challenges to provide the best search experience to our customers. What Mission and Challenges You’ll Take On Collaborate with product managers to explore what exciting features we would deliver to our customers. Break down large tasks in

LegalOn Technologies is a global leader in legal AI solutions, trusted by more than 8,000 companies and law firms worldwide. The company empowers legal teams to review and negotiate contracts faster, with greater accuracy and confidence. Operating across Japan, the United States, and Europe, LegalOn is the first AI company from Japan to surpass ¥10 billion in annual recurring revenue (ARR) and has raised over $200M from leading investors including SoftBank and Goldman Sachs. It also has one of the largest and most global AI teams of any startups in Japan. In 2025, LegalOn achieved its first M&A by welcoming Germany's Fides Technology into the group, further accelerating global expansion. LegalOn combines LLMs, intelligent Agents and intelligent AI-driven workflows. Beyond legal, the company now offers specialized AI solutions including "CorporateOn," "CXOn," and "DealOn" to support diverse business domains requiring high expertise. In partnership with OpenAI, the company is redefining the legal AI landscape and developing innovative solutions for the future of professional work. For more details about our company, products, and development organization: https://legalforce-recruit.notion.site/LegalOn-Technologies-Candidate-Handbook-17d82a58637480d2836ae138e5b5ee95 What Mission and Challenges You’ll Take On: Own the design, development, and operation of AI-native features centered on RAG, LLMs, and AI agents, going beyond model implementation to deeply integrate with UI/UX and business workflows to deliver truly usable AI experiences. Lead end-to-end decision-making across model selection, inference architecture, RAG design, and agent design based on specific use cases, balancing both quality and speed. Design and implement robust operational frameworks—including evaluation, monitoring, logging, and cost optimization—to continuously improve and maintain a reliable and trustworthy AI experience.

We have developed and proposed a cloud service (SaaS) that automates work in the fields of accounting and finance by utilizing AI (deep learning) and combining it with deep learning technology centered on AI-OCR. This service is attracting a great deal of attention as a service that realizes accounting DX and realizes the way of accounting in the digital and AI age, and opportunities for introduction and business negotiations are increasing dramatically, mainly among enterprise companies. In September 2023, we listed on the TSE Growth Market and are aiming to further expand our business. We are looking for new colleagues to strengthen our team to realize continuous improvement of service functions and quality of each product. ◆ Job Description As a backend engineer (full stack engineers welcome), you will develop AI services specialized in the accounting field developed in-house. The main in-house developed products are “Robota”, “Remota”, and “Billing (Peppol) platform service”, and there are three major development projects related to them. 1) Web application service to support DXing of accounting tasks by AI 2) AI engine API service to support accounting automation 3) Standard (Peppol) platform service to send and receive electronic invoices from various systems This position will be involved in all projects and develop common infrastructure areas using AI. FA is developing in scrum teams, collaborating with in-house research teams (research scientists (CV, NLP)) and related engineers to carry out projects. ◆Main areas of application 　- Development of AI programs and implementation of AI models for “Robota,” “Remota,” and “Peppol compatible products 　 Research related items : 　 image recognition, natural language processing, document analysis, LLM, research papers, reproduction implementation, deep learning, data analysis 　 Development related items : 　 API development, AI model implementation, prototyping In order to continuously improve system development to enhance experience, quality, and