Senior AI Engineer

Legal On Technologies is a global leader in legal AI solutions, trusted by more than 7,000 companies and law firms worldwide. Our software empowers legal teams to review and negotiate contracts faster, with greater accuracy and confidence. Operating across Japan and the United States, we are backed by leading investors with over $180M raised.
We bring together large language models (LLMs), a proprietary Legal Document Graph that organizes complex legal information, and intelligent AI-driven workflows. In partnership with OpenAI, we are redefining the legal AI space and delivering innovative solutions for the future of legal work

We are looking for a Senior AI Engineer to join our team. You will be at the forefront of designing, developing, and deploying agentic LLM workflows that leverage cutting-edge AI techniques to streamline contract workflows
, with a strong focus on the legal domain. This is a unique opportunity to apply your expertise in AI and software engineering to solve complex, real-world challenges in a high-impact setting.

• Design and implement robust agentic LLM workflows for production.
• Integrate AI solutions with existing SaaS platforms, internal APIs, and legal workflow systems.
• Evaluate third-party models, frameworks, and services to determine their suitability and integration potential.
• Collaborate with cross-functional teams to gather requirements, understand user needs, and deliver high-impact agent solutions.
• Build tooling and observability to monitor, test, and evaluate AI agent performance.
• Conduct code reviews and maintain best practices in documentation and version control.
• Diagnose and resolve issues in AI systems to ensure accuracy, reliability, performance, and scalability.

• Bachelor’s or Master’s degree in Computer Science, Artificial Intelligence, Machine Learning, or a related field.
• 3+ years of experience in developing agent products or similar AI applications.
• Strong proficiency in one programming language (e.g., Python).
• Strong understanding of LLMs, retrieval (RAG), and agent orchestration.
• Experience with AI frameworks and agent development tools (e.g., Lang Graph, CrewAI, MCP).
• Solid problem-solving skills and meticulous attention to detail.
• Effective communication and collaboration skills in a global environment.
• Flexibility of collaborating with engineers in Tokyo time zone.

• PhD. in a relevant technical field.
• Experience with cloud platforms such as AWS, Google Cloud, or Azure.
• Knowledge of NLP techniques, RAG systems, and prompt engineering.
• Contributions to open-source projects or publications in AI research.
• Experience deploying and maintaining AI models in production environments.
• Strong communication skills, with the ability to communicate effectively across diverse cultures in both English and Japanese.

Join our collaborative, high-performance culture driven by curiosity and continuous improvement. You'll work alongside passionate professionals in an environment that fosters innovation and creative problem-solving. Together, we tackle complex challenges in legal automation, leveraging AI to transform the industry.

• Full-time position
• This role is open to remote candidates
• Flexible work arrangements: for applicants in the Bay Area we offer a hybrid work model with an office in the heart of San Francisco. For others, we embrace a remote working environment
• Competitive compensation and stock options
• Robust benefits: comprehensive health, dental, and vision insurance, generous PTO, plus a 401K plan