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Guillaume Roche-BayardGR

Guillaume Roche-Bayard

Founding Software Engineer

€1,000/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

Passionate about code since the age of 12, I have transformed this passion into a solid expertise of nearly 10 years in frontend development.

Throughout my assignments, I have had the opportunity to lead frontend teams, mentor junior developers, and deliver high-performing, intuitive, and user-centric web interfaces. I don't just write clean code — I ensure that each project brings real added value, both for end-users and for the organizations that trust me.

What sets me apart? Constant technological monitoring, strong adaptability, and a user experience-centered vision. I work on projects from scratch as well as on existing codebases, with the same level of rigor.

Looking for a reliable, autonomous, and proactive frontend freelancer for your scale-up or digital product? Let's talk.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Phacet
    Founding Software Engineer
    March 2025 - Today (1 year and 3 months)
    Paris, France
    Phacet helps operations, finance, and product teams automate high-volume document workflows by deploying AI agents (Phacets) on their real business
    data — powered by LLMs, business rules, and Python, with built-in human oversight.
  • Matera
    Tech Lead Front & Chapter Lead
    September 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.
  • Matera
    Software Engineering Manager
    March 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 950
    TOEIC - Anglais 950
  • Master in Computer Science
    EPITECH - European Institute of Technology
    2017
    Master en informatique

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