I’m a product designer who works from first principles—shaping structure, flows, and systems until the experience feels calm, clear, and inevitable.
I design products where complexity, data, and real-world constraints actually matter.
I design with a strong bias toward evidence. I use product data, qualitative insight, and clear success metrics to inform decisions, especially around activation, retention, and UX tradeoffs. I’m comfortable defining what to measure, querying data when needed, and using insight to guide iteration rather than relying on opinion or aesthetics alone.
I specialise in designing logic-heavy SaaS experiences such as onboarding, configuration flows, admin states, publishing logic, and edge-case handling. I focus on making complex systems understandable by introducing rules progressively, defining safe defaults, and keeping behaviour consistent across the product.
I care deeply about getting users to meaningful value quickly. I design onboarding and first-run experiences that help users understand what a product is for, what to do next, and why things behave the way they do. My focus is on confidence and clarity, not just completion.
I build design systems as a way to reduce repeated decisions and scale consistency, not as an end in themselves. My approach is behavioural first: shared patterns for states, validation, empty views, and feedback that emerge from real product work and evolve with the product.
I have experience designing data-driven interfaces where clarity, hierarchy, and expectation-setting matter. I focus on helping users understand what data means, what it doesn’t, and what will happen next, especially in products where misinterpretation can damage trust.
I’m a product designer who can take an idea from problem framing through design, implementation decisions, iteration, and learning. Having built and launched multiple products independently, I’m comfortable working under ambiguity, making tradeoffs, and shipping without perfect information.
Featured work
Kompi
Designed a single platform that replaced fragmented tools, standardising brand execution and performance visibility
Jimbo
Designed a simple automation product that removed repetitive steps while keeping workflows clear, predictable, and trusted.
KompiPay
Built a payments workflow that simplified Stripe setup, environments, and webhooks, reducing setup time, cost, and errors.
Soissons Belles
Led product design across the ecommerce experience—UI, branding, and checkout—plus data enrichment, internal org systems, and a KompiPay payment gateway build.
Findaly
Designed a discovery platform built on strong information architecture to help users compare tools and make confident choices.
I work across the whole arc — from framing the problem to defining behaviour, shipping UI, and learning fast once it’s live.
Turn fuzzy ideas into a decision-ready brief: constraints, success metrics, and what “good” looks like.
Outcome: clearer decisions, fewer surprises, better shipping velocity.
Define the logic before the UI: roles, states, edge cases, safe defaults, and how the product behaves under stress.
Outcome: clearer decisions, fewer surprises, better shipping velocity.
Design the interface with real constraints: components, validation, empty states, and predictable patterns across the product.
Outcome: clearer decisions, fewer surprises, better shipping velocity.
Ship with intent: activation paths, instrumentation, and fast iteration so the product improves after release — not before it.
Outcome: clearer decisions, fewer surprises, better shipping velocity.
Tools & platforms
A mix of design, motion and build tools I rely on day-to-day — from early exploration to production-ready launches.
Figma
Product design
Framer
Prototyping
Adobe Illustrator
Identity & vector
Adobe Photoshop
Imaging
Adobe After Effects
Motion
Procreate
Illustration
Notion
Docs & systems
Slack
Collaboration
Webflow
Web
Cinema 4D
3D & motion
WordPress
CMS & publishing
Elementor
No-code web
React
Front-end
Vercel
Deploy & hosting
VS Code
Editor
Figma
Product design
Framer
Prototyping
Adobe Illustrator
Identity & vector
Adobe Photoshop
Imaging
Adobe After Effects
Motion
Procreate
Illustration
Notion
Docs & systems
Slack
Collaboration
Webflow
Web
Cinema 4D
3D & motion
WordPress
CMS & publishing
Elementor
No-code web
React
Front-end
Vercel
Deploy & hosting
VS Code
Editor
I reduce ambiguity, make tradeoffs explicit, and ship work that holds up in real systems.
Decisions follow data, insight, and success metrics — not taste.
I design states, rules, defaults, and edge cases before polishing UI.
I clarify what we’re optimising for, what we’re sacrificing, and why.
I stay close to implementation to prevent surprises and protect intent.
Launch is the start: instrument, learn, and improve what matters.
A few notes from founders, marketers, and creative leads across product, e-commerce, and brand.
Hiring a designer or studio for an e-commerce project is an act of high responsibility. E-commerce businesses survive thanks to the sales generated through the site, and therefore the Look & Feel and UX/UI play an essential role.
Claudio
Founder · Gourmet Hunters
I got in touch with William to help me create the name, logo, the branding and as well prepare a pitch deck for my professional project.
Remi
Founder · Archi AI
William is a visionary senior creative with an exceptional talent for branding and staying ahead of trends.
Julia
Marketing Lead · E-Learning Software
I highly recommend William Mattey for anyone in need of a top-tier professional.
Christian
Multimedia Producer · UNO
End-to-end product work
A small selection of work where I've been responsible for the complete arc — strategy, brand, product, marketing and launch assets — instead of just a single screen or logo.
Subscription analytics & billing
A product used by teams to understand revenue, churn and customer health. I led the end-to-end journey from positioning and brand through to product UX, UI, and launch site.
Retail experience platform
A platform for modern retail brands to orchestrate campaigns, content and customer journeys. I owned the full cycle from first workshops to live product, design system and launch materials.
Idea-to-shipping workspace
A workspace for capturing ideas, shaping concepts and turning them into shipped work. I handled naming, identity and product UX as one coherent system.
Calm productivity companion
A focused companion app that blends planning, timers and reflection. I designed the full experience from flows and motion to final UI and app store assets.
Clients & sectors
From construction and museums to retail media, hospitality and e-commerce — a snapshot of teams I've helped across brand, product and content.
Selected work
A continuously scrolling strip of projects I've helped shape across brand, product and web.
