Sonny Tessier

Your Design System exists, but no one uses it? Developers bypass the library, components vary from one squad to another, UI tickets pile up?

That's exactly where I come in.

I'm Sonny Tessier, a Product Designer specializing in Design Systems for B2B SaaS. I help CPOs of scale-ups and CEOs of early-stage companies with the audit, redesign, and real adoption of their Design System.

🏆 My latest projects

✔ Novo Nordisk: UX/UI optimization of product pages for novonordiskpro.fr, emailing design system, ongoing long-term mission

✔ Agyre: MVP webapp desktop and mobile, Minimum Viable Design System ready to scale, 8 co-creation workshops

✔ Pertimm: 5 Design Systems implemented and monitored, design tokens in CI/CD

🎯 My services

- Design System Audit: adoption, governance, debt

- MVDS creation for early-stage products

- Design System redesign for scale-ups, hybrid governance

- Design tokens, ZeroHeight documentation, team onboarding

- Product design UX/UI: user journeys, wireframes, Figma prototypes

- Accessibility WCAG / RGAA

🚀 How we work

1. 20-min diagnostic: your context, 3 concrete actions identified

2. Scoping: adoption and time-to-market KPIs defined

3. Intensive 3-week engagement: audit, redesign, governance, deployment with your teams

4. 3-month adoption follow-up: measurement, adjustments, team autonomy

Design System adoption is a long-term game: I stay until it's measurable. I speak to developers and designers alike, and every deliverable proves its value: reduced time-to-market, controlled technical debt. No deliverables end up in a drawer.

💬 Contact me now, I respond within the hour.