Accessible Fintech Dashboard
Built a WCAG 2.2 AA compliant financial dashboard with D3.js visualizations, achieving zero accessibility violations and 4.8:1 color contrast across all data visualizations.
Key Outcomes
WCAG 2.2 AA compliance with axe-core automated scans + manual testing
Across all data visualizations, exceeding WCAG 2.2 AA minimum (4.5:1)
All charts navigable and understandable with NVDA and VoiceOver
Full functionality accessible via Tab, Enter, Escape without mouse
Designed and implemented an accessible financial dashboard for a fintech startup serving 50,000+ users. Used React 19, TypeScript strict mode, and D3.js for data visualizations with full keyboard navigation support. All charts include ARIA labels, semantic HTML structure, and respect prefers-reduced-motion for animations. Implemented custom color palettes ensuring 4.8:1 contrast ratio for all data points. Added screen reader announcements for real-time data updates using ARIA live regions. Validated with axe-core (zero violations), manual keyboard testing (Tab/Shift+Tab/Enter/Escape), and screen reader testing (NVDA, VoiceOver). Achieved WCAG 2.2 AA compliance with focus on Success Criteria 1.4.3 (Contrast), 2.1.1 (Keyboard), and 4.1.3 (Status Messages).
Technical Details
Accessibility Implementation
Implemented comprehensive accessibility patterns: (1) Semantic HTML with proper heading hierarchy (h1-h6), (2) ARIA labels for all interactive elements and chart data points, (3) Keyboard navigation with visible focus indicators (2px solid outline), (4) Screen reader announcements for real-time data updates using aria-live='polite', (5) Respect prefers-reduced-motion for animations, (6) Custom color palettes with 4.8:1 contrast ratio validated with WebAIM contrast checker. All patterns tested with axe-core automated scans, manual keyboard testing, and screen reader testing (NVDA on Windows, VoiceOver on macOS).
D3.js Visualization Patterns
Built accessible D3.js chart components with: (1) SVG elements with proper ARIA roles and labels, (2) Data table alternatives for screen readers using <table> with aria-hidden on visual chart, (3) Keyboard-navigable data points with Tab/Arrow keys, (4) Focus management for chart interactions, (5) High contrast color scales (4.8:1 ratio) using d3-scale-chromatic with custom modifications. All charts include descriptive titles, axis labels with units, and legend with pattern fills for color-blind users. Validated with axe-core and manual screen reader testing.