Nelson Okunlola

Led development of enterprise dispute modernization platforms for internal analysts and cardholders, delivering $490K+ in annual operational savings and eliminating 21,000+ hours of manual work. Architected and delivered a compliance letter processing platform handling ~50,000 letters/month with ~98% automation accuracy via automated reconciliation and validation workflows. Redesigned a dispute document intake system into a distributed microservices architecture, increasing throughput 20x to support 10,000+ emails/day. Led a team of 6 engineers building a digital disputes platform enabling cardholders to initiate and track disputes via secure SMS/email workflows. Integrated AI-powered international address validation and duplicates detection, reducing unnecessary case creation and analyst overhead. Migrated legacy VM-hosted apps to Visa's internal Kubernetes platform, reducing deployment times from 2–4 hours to 5–10 minutes through containerization and CI/CD modernization. Achieved

Engineered REST API endpoints and PHP-based caching for a WordPress platform serving a Black Chicago news audience, improving backend response times and content delivery reliability. Led full-stack development of a Google Maps-integrated mobile app, designing the data layer with MongoDB and Express.js and building the frontend in Vue.js.

Designed a responsive newsletter for routine distribution of local news to Chicago readers. Contributed to a full responsive website redesign, owning frontend development in HTML, CSS, and JavaScript.