Book a Marketing Consultation with Mariusz O. | Upwork

Marketing Consultation with Mariusz O.

4.9 · 1,781 reviews

I’ll give you information about email marketing. What platforms you can use for your project, and what automations you can implement. The most important thing is to have access to at least basic statistics, which can later be used for marketing automation. Choosing the right email marketing platform is crucial to tailor it to your needs and capabilities.

Get personalized advice on:

Content Marketing Ecommerce Marketing Email Marketing Marketing Strategy Marketing Web Analytics salesforce mailchimp email & newsletter marketo hubspot

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About Mariusz

EXPERT EMAIL DEVELOPER || Email Marketing Strategist & AI Architect II

99% Job Success

4.9 (1781 reviews)

Opole, Poland - 2:11 am local time

I'm an Email Developer and Email Marketing Strategist with a programming background in AI-powered automation and system architecture.

With 15+ years of experience, 4,000+ projects delivered for 1,900+ clients worldwide, I build production-ready email systems - not just templates - combining clean HTML/CSS, lifecycle automation, marketing strategy, deliverability expertise, and AI-driven workflows under one roof. Top Rated Plus on Upwork with $700K+ in earnings.

What I do:

1. Email Development (Core)
Custom HTML/CSS email builds - mobile-responsive, dark-mode-ready, cross-client tested. I work across Mailchimp, HubSpot, Salesforce / Pardot, Marketo, Klaviyo, ActiveCampaign, Campaign Monitor, SendGrid, and Iterable. In 2015, Mailchimp recognised me for identifying and fixing critical rendering bugs in their templates. Certified Mailchimp Partner.

2. Email Marketing Strategy & Execution
End-to-end email marketing - audits, campaign planning, segmentation, lifecycle automation (welcome, nurture, re-engagement, winback), A/B testing, and performance optimisation. I build scalable, compliant email programs with predictable long-term performance. I handle both strategy and execution end-to-end.

3. AI Architecture & Intelligent Automation
I build AI-powered audit and automation systems connected directly to your ESP/CRM via MCP servers. AI analyses your flows, campaigns, deliverability, and engagement data in real time - producing structured audit reports and prioritised fix lists. Examples: automated Klaviyo flow audits with copy rewrites, real-time deliverability monitoring, and engagement scoring. I also build RAG MCP servers that let AI reference your internal docs, brand guidelines, and performance history during audits and content generation.

4. Front-End & Automation Development
Custom applications, internal tools, dashboards, and integrations using JavaScript, Python, React, Google Apps Script, and n8n. I connect CRMs, ESPs, databases, Google Sheets, and APIs into unified automated workflows.

Core services:

★ Custom email development (HTML/CSS, dark mode, responsive, cross-client)
★ Email marketing strategy, audits & campaign execution
★ AI-powered ESP/CRM audits via MCP server integration
★ RAG MCP servers for context-aware AI recommendations & content generation
★ Lifecycle automation (welcome, onboarding, nurture, re-engagement, winback, lead scoring)
★ Deliverability setup & troubleshooting (SPF, DKIM, DMARC, sender reputation)
★ Segmentation strategy (openers, clickers, inactive users, RFM, predictive)
★ A/B testing, reporting & performance optimisation
★ Advanced ESP customisation (HubSpot HubL, Salesforce AMPscript, Marketo Velocity)
★ AI agents & n8n automation systems
★ CRM & ESP integrations (HubSpot, Salesforce, Marketo, Mailchimp, Klaviyo, ActiveCampaign)
★ Custom Google Sheets & Apps Script solutions (dashboards, triggers, integrations)
★ API-based integrations & webhook workflows
★ Cross-client email testing (Litmus, Email on Acid, dark mode, Outlook VML fixes)

Why work with me:

★ 15+ years in email development and email marketing
★ 4,000+ projects for 1,800+ clients (Microsoft, Netflix, Unilever, Toyota, Adobe, BBC, Meta, Amazon Prime Video, TikTok, Adidas, Sony, Coca-Cola, Hyundai, LG, Renault, Bayer, 3M, and more)
★ Member of 32 Upwork Talent Cloud groups (Enterprise Professionals, Microsoft UTC, Netflix Print Production, Unilever, Tata Communications, Holland & Barrett, Janus Henderson, and others)
★ AI-powered audit and automation capabilities (MCP + RAG architecture)
★ End-to-end ownership - strategy, development, execution, optimisation
★ Clean, maintainable code and scalable architecture

Certificates: HubSpot Marketing Software, HubSpot Email Marketing, HubSpot Contextual Marketing, Mailchimp Email Automations, Mailchimp Foundations, Python (Alison), Salesforce for Admins, Managing DNS, Advanced CSS Media Queries, Google Ads Measurement.

Skills: HTML5, CSS, Email Development, Email Deliverability, AMPscript, HubSpot HubL, Marketo Velocity, JavaScript, Python, React, Google Apps Script, n8n, APIs & Webhooks, MCP Servers, RAG Architecture, AI Agents, Marketing Automation, CRM Integrations

I use AI as a development and analysis accelerator - speeding up coding, testing, auditing, and iteration - while maintaining full control over architecture, logic, and production quality.

Availability:
★ Mon–Thu: 3:00 AM – 11:00 AM EST, 3:00 PM – 7:00 PM EST
★ Friday: 3:00 AM – 11:00 AM EST

What to expect

Schedule the consultation

Choose from the freelancer’s available days and times.

Get advice for your custom needs

Share details about your project and what you want to talk about. The freelancer will review and reach out if they have questions.

Join the Zoom meeting

1-on-1 meeting with the freelancer to discuss your needs and project.

Approve the work

The freelancer will finish up the documents you asked for and send them to you for approval:

Before the consultation

Here’s what Mariusz will need to know before you meet

Do you have any analytics connected to your website for client identification purposes? What is the address of your website?

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