mario castillo cuenca

I’m a UI/Product Designer with over 4 years of experience in digital products and email UI. I specialize in optimizing design systems (tokens, components, usage guidelines) and building robust emails in Salesforce Marketing Cloud with hybrid/fluid HTML and multi-client QA (Outlook, Gmail, Apple Mail). I combine strategic vision with technical detail: from clear developer documentation to domain authentication and deliverability (SPF/DKIM, IP reputation). I’m driven to create scalable, accessible (WCAG AA), and growth-ready experiences.