Inconsistent design patterns and slow UI development fragmented our engineering efforts across multiple frontends. Vernix was developed as a unified Svelte component library to enforce design system consistency and provide pre-built accessible components with smooth transitions.
DESIGN SYSTEMS & FRONTEND ARCHITECTURE
Vernix Accessible UI Primitives.
Inconsistent design patterns and slow UI development fragmented our engineering efforts across multiple frontends. Vernix was developed as a unified Svelte component library to enforce design system consistency and provide pre-built accessible components with smooth transitions.
EXECUTIVE SUMMARY
KEY CONTRIBUTION
"Built a headless, unstyled core alongside a styled thematic layer using CSS variables, allowing consumer apps to inherit logic while retaining deep branding control."
LIBRARY STRUCTURE
High-level overview of the control and data plane components.
UI COMPONENTS LAYER
Components
Buttons, Inputs, Modals & Base Primitives
Theming System
CSS variables and theme injection
INTEGRATION LAYER
SvelteKit
Native framework integration & SSR
Vite
Fast compilation & asset bundling
ENGINEERING STACK
Modern frontend tooling for component libraries.
FRAMEWORK
Svelte 4SvelteKitTypeScript
STYLING
SCSSCSS VariablesPostCSS
DOCUMENTATION
StorybookHistoire
TECHNICAL DECISIONS
Documenting the trade-offs and architectural shifts during development.
Styling Strategy
Rationale: Baking utility classes into the distributed package forced consumer apps to match our exact Tailwind config. By defining semantic CSS variables instead, consumers can hot-swap themes globally with a single class change on the body element.
MEASURABLE IMPACT
Impact of systemic component reuse.
UI DEV SPEED
3x
⚡ Faster feature deliveryCOMPONENTS
45 +
⚡ Fully accessiblePOSTMORTEM & LEARNINGS
Reflections on design system maintainability.
Extracting complex accessibility logic (like focus-trapping in modals and keyboard navigation in dropdowns) into the library meant consumer applications became instantly compliant with ARIA standards without extra developer effort.
Migrating the entire codebase from Svelte 4 to Svelte 5 to take advantage of runes and the new reactivity paradigm, which will further reduce bundle size and simplify internal component state.