Case Study: Lettria by Mathieu-William .Case Study: Lettria by Mathieu-William .

Case Study: Lettria

Mathieu-William .

Mathieu-William .

Designing a GraphRAG Platform for Regulated Industries

I collaborated with Lettria on their GraphRAG solution, a generative AI platform designed for regulated industries (CSRD, ESG, compliance). My role spanned product improvement and feature design, working closely with their product and engineering teams.

Key Contributions

UI Kit Foundation: Established the design system foundations (colors, typography, spacing, border-radius, and shadows) ensuring consistency from day one. As features evolved, I created components on-demand in close collaboration with developers, ensuring the system remained lean, adaptable, and technically feasible.
Chat History: Designed a multi-conversation system allowing users to maintain parallel discussions across different assistants and document sets.
Document-Based Q&A: Conceptualized the "ask on documents" feature enabling users to query specific document collections and receive LLM-generated answers grounded in source material.
Parsing Visualization: Created a transparency layer showing which document chunks were used to generate responses, building trust and auditability.
Permission System: Designed granular user roles (workspace, assistant, folder-level) for secure collaboration in regulated environments.
File Explorer Redesign: Overhauled the document/folder interface to improve scalability and readability as document volumes grow.

Process & Collaboration

Throughout the project, I worked hand-in-hand with the front-end developer, reviewing edge cases together, anticipating implementation challenges, and ensuring designs remained feasible and consistent as features evolved.

Impact

Together, we shipped an intuitive, compliant-ready UI that balances advanced AI capabilities with enterprise UX expectations, adapted to the realities of a growing startup.

User Interfaces

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Posted Mar 16, 2026

Designed GraphRAG AI platform UI for regulated industries with Lettria.