About Guillaume
French
Native or bilingual
English
Fluent
Experience
- PhacetFounding Software EngineerMarch 2025 - Today (1 year and 3 months)Paris, FrancePhacet helps operations, finance, and product teams automate high-volume document workflows by deploying AI agents (Phacets) on their real businessdata — powered by LLMs, business rules, and Python, with built-in human oversight.
- MateraTech Lead Front & Chapter LeadSeptember 2022 - March 2025 (2 years and 6 months)Paris, France• - Led the complete overhaul of a critical segment of the product, transforming the document interface from a static document UI to a drive-like experience. This involved a recode of drag & drop functionality and enabled document/ folder drop from the OS.• - Collaborated with the CTO to create a dedicated frontend chapter to address technical needs based on product roadmaps and conduct essential architecture reviews.• - Streamlined our tech stack by replacing Yarn, Lerna, and npm workspace with PNPM, Vite, and TurboRepo.• - Created a comprehensive design system with a focus on accessibility, developer experience (DevX), and lightweight code. Integrated with Figma and Storybook to facilitate a seamless designer-developer interaction.• - Conducted multiple streaming sessions and peer coding sessions, investing approximately 20 hours in knowledge sharing to enhance the team's technical expertise.• - Managed the technical frontend roadmap, ensuring alignment with project objectives and actively researching new technologies and conducting proof-of concepts (POCs) to assess their viability.• - Authored best practices with Loom examples and documentation to explain each architectural and technical choice.
- MateraSoftware Engineering ManagerMarch 2022 - September 2022 (6 months)• - Stepped into the role of Software Engineering Manager to provide critical support to the team during a transitional phase.• - Leveraged prior managerial experience to ensure a smooth transition and effective squad changes within the organization.• - Assumed a leadership role in managing a team of backend developers, demonstrating adaptability and technical expertise in Ruby to effectively guide and support the team.• - Collaborated with both frontend and backend teams to maintain productivity and ensure project goals were met.• - Supported and guided individual contributors, fostering a culture of teamwork and accountability.
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Education
- TOEIC - English 950TOEIC - Anglais 950
- Master in Computer ScienceEPITECH - European Institute of Technology2017Master en informatique