FinTech Global Platform
Re-architecting a legacy monolith into a composable Next.js 16 frontend. Achieved 99+ Lighthouse scores globally and reduced build times by 70%.
The Problem
A global fintech company was struggling with a monolithic Ruby on Rails frontend that had grown unmaintainable over 8 years. Build times exceeded 45 minutes, developer onboarding took weeks, and Lighthouse scores hovered around 45 on mobile. The legacy system couldn't support the company's expansion into 12 new markets.
Our Approach
We decomposed the monolith into a composable architecture using Next.js 16 with React Server Components. Critical financial widgets were migrated first using the Strangler Fig pattern to de-risk the transition. Each micro-frontend owned its data fetching, state, and error boundaries. We implemented Edge caching for public pages and aggressive ISR for authenticated dashboards. The design system was rebuilt from scratch with Radix UI primitives and Tailwind v4, ensuring consistent UX across all markets.
Key Results
Lighthouse scores improved from 45 to 99+ across all routes
Build times reduced from 45 minutes to under 3 minutes
12 new markets launched in 6 weeks instead of 6 months
Developer productivity increased 4x with the new component library
99.99% uptime with zero-deployment downtime via Vercel Preview Deployments
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