Dev. Email Architect & Cross-Client Testing Expert
"I engineer perfect HTML code that survives any email client. By merging advanced MJML development with rigorous testing, I guarantee zero rendering errors and 100% universal compatibility for every campaign."
[ Senior Email Developer | Deliverability & Performance Specialist ]
Tested to Perfection: Email Templates
Vanamy Agency
High-impact, responsive campaign designed in Figma and coded in pure HTML to ensure deliverability.
Ninja Food Tours
Email designed to convert first-time users into repeat customers through visual incentives.
AllTrails
Seasonal email e-commerce designed to boost sales of winter equipment.
Vesta Stream
Promotional retention email designed to boost subscriptions through limited-time offers.
TwitchCon Paris
High-impact promotional email designed for selling tickets to large-scale events.
Sundays: Newsletter
Editorial with a warm and minimalist approach, ideal for lifestyle and travel blogs.
Easyalgos
Transactional financial reporting email designed to present trading performance metrics.
WRK: Order Shipped
Transactional email templates for shipping confirmation with an elegant design.
High-Performance Email Engineering & CRM Automation Solutions
"I am Lope Renier B., an expert HTML Email Developer and certified CRM Specialist with over 3 years of experience and a distinct Top Rated (100% Job Success) rating on Upwork. My focus is exclusively on unifying your marketing vision with flawless code. I don't just 'make emails'; I engineer technical, fast-loading marketing assets that guarantee perfect rendering across all devices to maximize your campaign ROI."


Email Solutions
Expert HTML Email Development
"Welcome to my specialized freelance service. I focus exclusively on high-performance email engineering and automated CRM solutions. Whether you need complex template architectures, advanced personalization, or bulletproof rendering across all platforms, I provide the technical precision your campaigns demand."
Professionally coded templates that display perfectly across all major CRMs (HubSpot, Mailchimp, Klaviyo, ActiveCampaign) and email clients (Gmail, Outlook, Apple Mail, etc.), ensuring high deliverability and zero rendering failures.
Precision Development:
Flawless translation from Figma or Photoshop to clean, stable code, maintaining exact brand consistency.
Strategic Modularity:
Utilizing MJML’s component-based structure to build scalable templates that adapt seamlessly to every device.
Rigorous QA Testing:
Comprehensive validation via Email on Acid to guarantee cross-platform consistency and deliverability.
Cross-Client Optimization:
Leveraging my deep understanding of Outlook, Gmail, and Apple Mail, for flawless display across all major email clients.
Deliverability and Analytics:
Post-campaign analysis and advanced reputation management to maximize inbox placement and minimize spam flags.
Strategic Innovations:
Implementing advanced interactive elements like CSS animations, Offering consulting on dynamic content and A/B testing.
Write me
if you have any doubt, or if you want advice and a free preview write me, I will answer you as soon as possible.

"Code that breathes, solutions that inspire. Freelancer passionate about technology, digital life and the details that make a difference."
Copyright © 2026 Lope Renier Castañeda. All Rights Reserved.
