A Growing FinTech Needed to Scale — Fast
Our client, a US-based FinTech startup, had validated their product with early adopters but hit a wall. Their existing platform was a monolithic Ruby on Rails app that couldn't handle growing concurrency. Order execution times exceeded 2 seconds. The mobile experience was a web wrapper with poor performance. Compliance gaps were blocking their Series B fundraise.
2+ Second Latency
Order execution was too slow for active traders, causing user churn.
No Native Mobile
The mobile app was a WebView wrapper with frequent crashes and poor UX.
Compliance Gaps
Missing SOC 2 and SEC regulatory requirements were blocking fundraising.
A Complete Platform Rebuild — Architecture to App Store
We decomposed the monolith into event-driven microservices, built a native mobile experience with React Native, and implemented a real-time data pipeline that handles 50K+ concurrent WebSocket connections with sub-50ms latency.
Microservices Architecture
Decomposed into 12 independently deployable services with event-driven communication via Kafka, enabling zero-downtime deployments.
Native Mobile with React Native
Built from the ground up with React Native for iOS and Android, featuring real-time charts, biometric auth, and push notifications.
Real-time Data Pipeline
Custom WebSocket gateway handles 50K+ concurrent connections. Market data streams with sub-50ms latency using Redis pub/sub.
Security & Compliance
SOC 2 Type II certified infrastructure with end-to-end encryption, audit logging, and SEC-compliant trade reporting.
Tech Stack
Development Timeline
8 months from kickoff to App Store launch, delivered in 2-week sprint cycles.
Discovery & Architecture
Stakeholder interviews, technical audit of existing system, architecture design, and sprint planning.
Core Platform Build
Microservices scaffolding, database design, real-time data pipeline, authentication system, and Plaid integration.
Mobile App & Trading Engine
React Native app development, order execution engine, real-time charting, portfolio management, and push notifications.
Security Hardening & Compliance
Penetration testing, SOC 2 audit preparation, SEC reporting integration, performance optimization, and load testing.
Beta Testing & Launch
Closed beta with 5,000 users, bug fixes, App Store submission, marketing site, and production deployment.
Measurable Impact
Within 6 months of launch, every key metric exceeded initial targets.
“Codazz didn't just rebuild our platform — they transformed our business. The new trading engine is faster, more reliable, and our users love the mobile experience. They helped us close our Series B.”
CTOSeries B FinTech, New York
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