The client is a global legal AI company that combines advanced AI capabilities with specialized knowledge of law and contracts. Since its founding in 2017, the company has focused on building AI-powered legal services that help teams work faster, with greater accuracy and confidence. Its products bring together large language models, AI agents, and practical legal expertise to improve how documents are processed and contracts are analyzed.
The company’s work is shaped by close collaboration across engineering, machine learning, and product teams, with a strong emphasis on innovation, technical rigor, and real-world impact. Through its partnership with OpenAI, LegalOn Technologies continues to apply cutting-edge technology to legal workflows and build products that support modern legal operations at scale.
As a Senior Software Engineer focused on Search AI, you will lead the development of search, recommendation, and AI agent infrastructure that powers intelligent document processing and contract analysis. This role sits at the center of product innovation and requires someone who can architect robust systems, make strong technical decisions, and help shape the future of the platform.
Your work will include designing and building high-performance search and recommendation systems, developing AI agent applications, and improving system performance as usage grows. You will also support and mentor other engineers, research emerging search and AI technologies, and collaborate closely with engineering, ML, and product stakeholders to deliver scalable solutions. This is a hands-on role for someone who enjoys building core product infrastructure and working with modern AI-powered development tools.
3+ years of web backend development or equivalent software engineering experience
Product development experience, preferably with Python
Practical cloud infrastructure experience (AWS, GCP, Azure, or similar)
Japanese communication skills equivalent to JLPT N2 or practical experience
Interest in AI-powered development tools and processes
[suggestion: Bachelor’s degree in Computer Science or related field]
120+ days off per year, plus weekends and national holidays
Full social insurance, paid leave upon joining, special leave, self-development budget, language learning support, employee stock ownership plan, and side work permitted with approval
