FinTech
FinTech Core Migration
How we re-architected a legacy payment dashboard serving 50,000+ daily users, reduced load times by 90%, and increased conversion rates by 18%.
90%
Faster Load Time
LCP: 4.2s → 0.4s
+18%
Conversion Rate
Faster checkout flow
98/100
Lighthouse Score
Mobile performance
The Challenge
A Series B FinTech company approached us with a critical problem: their React 16 + Express dashboard was hemorrhaging users due to slow load times. Initial diagnostics revealed:
- LCP of 4.2 seconds (failing Core Web Vitals)
- 1.8MB JavaScript bundle (blocking main thread)
- No server-side rendering (SEO penalties)
- 41% mobile bounce rate
Our Approach
1. Next.js 14 App Router Migration
Chose Next.js for React Server Components, ISR, and edge deployment compatibility. Migrated incrementally over 6 weeks, maintaining full feature parity.
2. Performance Architecture
- Server Components: Eliminated 600KB of client-side JS
- Streaming with Suspense: Progressive rendering for slow DB queries
- Edge Functions: Balance checks deployed to Netlify Edge (<50ms TTFB globally)
- Image Optimization: Next/Image with WebP, AVIF, priority loading
3. Tech Stack
Frontend
- → Next.js 14 (App Router)
- → React Server Components
- → Tailwind CSS
Infrastructure
- → Netlify Edge
- → PostgreSQL (Supabase)
- → Redis (Upstash)
Results
Production Metrics (90 days post-launch)
- ✅ LCP: 4.2s → 0.4s (90th percentile, field data)
- ✅ Lighthouse: 98/100 (mobile), 100/100 (desktop)
- ✅ Bundle size: 1.8MB → 280KB (84% reduction)
- ✅ Conversion rate: +18% (faster checkout)
- ✅ Session duration: +23%
- ✅ Bounce rate: 41% → 24%
Client Attribution
"EVDOPES didn't just migrate our stack — they re-engineered our entire performance architecture. The 18% conversion lift paid for the engagement in the first month."
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