Cesar Castillo
WHO I AM
With extensive email development experience, I build scalable, high-performance, and accessible campaigns using semantic, modular HTML and CSS. I leverage ESP scripting (AMPscript, Liquid, Handlebars) to power data-driven personalization, localization, and AI-assisted automation at scale. I’ve led rebrands, platform migrations, and audits, with expertise in deliverability, dark mode optimization, and WCAG accessibility. I also design and maintain internal frameworks and component libraries that streamline production, ensure consistency, and elevate cross-team collaboration.
COMPANIES
I've worked with
Google Fiber
DoorDash
InboxMonster
OpenSea
Indeed
Target
BeachBody
FITURE
Really Good Emails
ESPs
I've mastered
Iterable
SFMC
Braze
Customer.io
HubSpot
Mailchimp
AND MORE.




