Job Description

The candidate required to work at Tokyo, Japan.

Client Overview

Our client is a globally recognized LegalTech and AI-driven SaaS company specializing in intelligent contract review systems, legal workflow automation, enterprise compliance tools, and generative AI-powered business solutions. Headquartered in Japan with expanding international operations, the organization is trusted by enterprises, legal teams, and multinational corporations seeking to modernize legal and operational processes through advanced technology.

Combining cutting-edge artificial intelligence with human-centered product development, the company continues to redefine enterprise software experiences through scalable design systems, multilingual product ecosystems, and high-performance cloud-based platforms. As part of its rapid growth phase, the organization is strengthening its Product Design division to build the next generation of AI-powered business applications.

Job Role

The Senior Product Designer is a high-impact strategic design role responsible for leading the end-to-end UI/UX architecture of advanced B2B SaaS and AI-driven product ecosystems. Acting as a Design Lead, the role focuses on transforming highly complex legal and enterprise workflows into intuitive, scalable, and elegant user experiences across web-based platforms.

The position requires a strong combination of UX research expertise, design systems mastery, AI product understanding, and cross-functional collaboration capability. The successful candidate will work closely with Product Managers and Engineers to create next-generation interfaces that balance technical sophistication, business scalability, and exceptional usability.

Key Responsibilities

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  Lead the end-to-end UI/UX design process for major SaaS product modules and enterprise software ecosystems.
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  Design intuitive and scalable interfaces for AI-powered workflows, advanced search systems, analytics dashboards, and enterprise productivity tools.
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  Conduct UX research activities including user interviews, usability testing, workflow analysis, and behavioral insights gathering.
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  Build wireframes, prototypes, interaction flows, and high-fidelity UI concepts for web-based SaaS platforms.
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  Collaborate closely with Product Managers, Engineers, and stakeholders to align user experience strategies with technical and business objectives.
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  Maintain and expand scalable Figma-based design systems to ensure consistency across multilingual product environments.
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  Utilize Generative AI tools and workflows to accelerate design iteration, prototyping, and product experimentation.
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  Analyze post-launch user behavior and continuously improve interfaces through iterative design optimization.
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  Advocate for user-centered product development and contribute to internal design process improvements.
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  Support design quality assurance and mentor junior designers when required.

Requirements

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  Bachelor's Degree or above in Design, HCI, Computer Science, Business, or related fields.
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  Minimum 3 years of hands-on experience designing web services, enterprise platforms, or B2B SaaS products.
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  Proven experience acting as a Design Lead or independently owning complex product modules.
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  Strong portfolio demonstrating advanced UI/UX problem-solving capability for digital platforms.
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  High proficiency in Figma, responsive UI systems, component libraries, and scalable design systems.
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  Practical experience working with Generative AI tools, AI-enhanced workflows, or AI-driven interface concepts.
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  Strong understanding of UX research methodologies, usability testing, and iterative product improvement cycles.
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  Experience collaborating within agile product development environments alongside engineers and product teams.
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  Strong communication, presentation, and stakeholder management skills.
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  Professional fluency in English is mandatory.
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  Japanese fluency is highly preferred for local collaboration and daily communication.

Job code: #687