Angel Rosario

Developed a scalable web application using Angular, ASP.NET, and MySQL for a major client, achieving 100% client satisfaction and directly contributing to the acquisition of a follow-up high-value project for the company. Led a team of 4 developers and 2 QAs, fostering a collaborative environment and delivering projects on time with minimal bug/client change turnovers. Optimized front-end code in Angular, improving performance by 25%. Mentored junior developers, led code reviews, and collaborated with UI/UX designers to build responsive, accessible, and reusable interfaces using Material UI and Bootstrap. Integrated third-party payment and authentication services (Stripe, Auth0) for secure e-commerce and user management. Optimized critical front-end performance metrics (LCP, CLS, FID), boosting Lighthouse scores by 60% and improving SEO. Implemented lazy loading, dynamic imports, and state management best practices for high-traffic pages.

Led the development of multiple high-quality web applications focusing on performance, usability, and conversion-driven design. Collaborated with stakeholders to deliver tailored solutions that increased client acquisition and retention. Contributed to marketing materials including photo and video content for internal branding and client campaigns, enhancing brand visibility and engagement.

Re-designed and improved performance for the company’s main SAAS application, increasing front-end performance by over 50%. Served as the lead developer for CMS-related projects (WordPress, Joomla, Squarespace), delivering fast turnarounds while balancing responsibilities across multiple initiatives.