Cesar Alonso O.

HTML Email Developer | MJML, Klaviyo & Cross-Client Compatibility

I’m an HTML Email Developer with 5+ years of specialized experience in email development, building responsive, reliable HTML emails that render consistently across Outlook, Gmail, Apple Mail, Yahoo, iOS, Android, and other major email clients. I specialize in turning designs and requirements into clean, responsive, production-ready HTML email templates with a strong focus on cross-client compatibility, accurate design implementation, and maintainable code. 💡 What I Deliver: ✅ Responsive HTML Emails – Hand-coded email templates built for desktop, tablet, and mobile devices. ✅ Cross-Client Compatibility – Email development and troubleshooting for Outlook, Gmail, Apple Mail, Yahoo, mobile clients, and other major inboxes. ✅ MJML Email Development – Structured, responsive email templates using MJML when it is the right solution for the project. ✅ Design to HTML Email – Figma, PSD, XD, Sketch, or PDF designs converted into responsive HTML email. ✅ Email Rendering Fixes – Troubleshooting and fixing layout, spacing, typography, image, responsiveness, and client-specific rendering issues. ✅ Dark Mode Support – Email templates optimized to provide a more consistent experience across supported clients. ✅ Email Testing & Optimization – Testing with tools such as Litmus and Email on Acid to identify rendering issues before delivery. 📬 Platforms & Technologies: HTML • CSS • MJML • Figma • Adobe XD • Sketch • Litmus • Email on Acid • Klaviyo • Mailchimp • SendGrid • HubSpot I can work with the platform or ESP your team already uses. My specialization is the email development itself, so the solution is not tied to a single platform. 🚀 Why Clients Work With Me: • Specialized focus on HTML email development • Strong understanding of email client rendering and compatibility • Clean, structured, and maintainable email code • Accurate implementation from design files • Attention to responsive behavior and mobile rendering • Experience troubleshooting existing HTML email templates • Technical background with a strong focus on reliability and detail Whether you need a new HTML email template, an MJML build, a Figma-to-HTML email conversion, an existing template fixed, or cross-client rendering issues resolved, I focus on delivering email code that is clean, responsive, tested, and ready to use. Have a design, existing HTML email, or rendering issue? Send me the details and let’s build a reliable email template that works across your customers’ inboxes.