Mariusz Opalka
Email Design, Development & Automation Expert
Deliverability · Google Sheets · AI Agents
With over 15 years of experience, I help companies design, code, and build high-performing email automation workflows. I specialize in advanced behavior-based email workflows, custom modules, and dark-mode-ready templates. I am a member of 32 Upwork Talent Cloud Groups.
"In September 2015, I was recognized by Mailchimp for identifying critical template bugs that caused rendering issues. I am a certified member of the Mailchimp Partner Program, and my improved HTML/CSS code is still used today to ensure proper email rendering in Outlook."
Expertise
Key Competencies
Comprehensive proficiency in email development, automation, and AI integration.
Technical Skills
Core Proficiencies
Email Marketing Audit
Email Design & Coding (Tested Across 100+ Email Clients)
Drag & Drop Templates (Mailchimp, HubSpot, Marketo, SalesForce, ...)
Custom Modules (HubL, AMPscript, Velocity)
Deliverability (DKIM, SPF, DMARC) – Consulting and setup of domains and mailing systems
AI-Powered Automations (n8n, Zapier)
Cloud-Based Python Applications (GCP)
API & Database Integrations
AI Agents, Chatbots & RAG MCP Servers
Web Scraping Applications
Google Sheets Scripting (Apps Script)
Custom RAG Model Context Protocol (MCP) Servers
Supported Platforms
Expertise in creating responsive email templates and building robust automation workflows across major marketing platforms, including but not limited to:
Upwork Performance
Career Highlights
Total Earnings
Total earnings generated on Upwork.
Satisfied Clients
Highly satisfied clients across various industries.
Jobs Completed
Successfully delivered projects for global clients.
Job Success
Consistently maintaining a high Job Success Score.
Qualifications
Education & Certifications
Education
MSc in Marketing & Management
J. Kochanowski University
Kielce, Poland
"A solid academic foundation in marketing principles, combined with over a decade of hands-on technical execution."
Certifications
Apps & Tools
Custom Automation Tools
Beyond standard development, I build custom applications and automation workflows designed to save time and solve complex business problems. Below are ready-to-deploy solutions available for purchase.
Email Marketing Audit
AI-powered audit of your entire email marketing system — flows, campaigns, lists & segments — with a prioritised revenue & fix action plan. Personally verified by me before delivery.
YouTube RAG MCP Server
Custom Model Context Protocol (MCP) server for Claude Desktop & Cloud AI. Upload YouTube videos or documents to a vector database and chat with them using semantic search.
Multi-AI Reddit Monitor
Advanced Reddit automation powered by Gemini AI & Perplexity AI with an auto-failover system. Ideal for social listening and automated engagement.
Custom Travel Price Monitor
A Python-based price monitoring application hosted on Google Cloud Platform with Supabase integration for real-time tracking.
Python Transcription App
Converts audio and video files to text with high accuracy. A custom Python solution for automated transcription workflows.
Self-Learning AI Agent
A smart chatbot for your website integrated with ChatGPT and n8n that talks to clients and schedules calls automatically.
Google Sheets Email Sender
A custom app for sending bulk HTML mailings directly from Google Sheets via Gmail or Google Workspace.
HubSpot & Google Sheets Sync
Apps Script application for seamless bi-directional synchronization between HubSpot CRM and Google Sheets.
Commercial Jingle Production
Complete commercial jingle creation including lyrics and music production (MP3).
Cloudflare Worker App for Free Website Stats
Accurate visitor statistics with IP addresses — not available in Google Analytics or free Cloudflare. Built on a properly configured free Cloudflare account with bot filtering and a Worker connected directly to Google Sheets.
Custom React Email & Design Preview Application with Secure Sharing
Securely share design previews with clients via password-protected galleries.
Trusted by Industry Leaders
I've had the privilege of working with some of the world's most recognized brands.