We do not build "websites." We engineer complete financial and operational ecosystems.
Below are deployed systems currently running in production, designed and built by Marcello Nascimento.
Production ReadyScalable ArchitectureBanking-Grade Security
01 // COMPLIANCE ARCHITECTURE
Leon LDA & Notary System
A fully integrated legal document processing platform. This system handles complex intake forms, automated document generation, and secure client portals. It bridges the gap between rigorous California legal code and user-friendly digital experience.
Technical Implementation:
•Custom React forms with real-time validation and multi-step intake process
•Automated PDF generation with California legal compliance templates
•Secure document storage with AES-256 encryption and access controls
•PostgreSQL database with optimized queries for document retrieval
Two proprietary fintech platforms built to manage micro-transactions and prevent financial slippage. We engineered the backend logic to handle real-time calculations, banking API integrations, and predictive overdraft alerts.
Technical Implementation:
•Real-time banking API integration with Plaid and Stripe Connect
•Predictive algorithms using Python to forecast overdraft scenarios
•Micropayment ledger system with double-entry bookkeeping
•AWS Lambda functions for serverless transaction processing
> REAL-TIME BANKING APIs
> PREDICTIVE ALGORITHMS
> MICROPAYMENT LEDGERS
> PCI DSS COMPLIANT
[INTERNAL ACCESS ONLY]
03 // CORPORATE IDENTITY
Leon Partners Group
The central digital nervous system for the holding company. We architected a multi-brand portal that seamlessly routes traffic between the Legal, Tech, and Financial divisions while maintaining a cohesive brand voice.
Technical Implementation:
•Next.js static site generation for optimal performance (100 PageSpeed score)
•Intelligent routing system directing users to appropriate subsidiary brands
•Unified design system ensuring brand consistency across all properties
•CDN deployment with global edge caching for sub-100ms load times
Every project showcased here represents hundreds of hours of precision engineering. If you need a system that handles real money, real legal documents, or real operational complexity, Marcello Nascimento and the Leon Labs team can deliver.