You will get an Apps Script application for syncing HubSpot and Google Sheet
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Top Rated
Project details
You will get an Apps Script application for syncing HubSpot and Google Sheets.
I will install the HubSpot API and Webhook.
The application will include these functions visible at the top of the sheet:
• Fetch contacts from HubSpot to Google Sheet (fetches email addresses from HubSpot, saves them to Google Sheets, checks for updates in HubSpot, and syncs them).
• Push contacts from Google Sheet to HubSpot (sends email addresses from Google Sheets to HubSpot).
• Remove duplicates from Google Sheet (removes duplicate emails).
• Check updated data in Google Sheet and send to HubSpot (syncs updated data like first name, last name, phone, etc., to HubSpot).
• Remove emails in HubSpot not in Google Sheets (deletes HubSpot emails missing in Google Sheets).
• Remove emails in Google Sheets not in HubSpot (deletes Google Sheets emails missing in HubSpot).
The Google Sheets database includes:
• Email
• First Name
• Last Name
• Life Cycle Stage
• Created At
• Last Modified At
• Phone
• ID
I will install the HubSpot API and Webhook.
The application will include these functions visible at the top of the sheet:
• Fetch contacts from HubSpot to Google Sheet (fetches email addresses from HubSpot, saves them to Google Sheets, checks for updates in HubSpot, and syncs them).
• Push contacts from Google Sheet to HubSpot (sends email addresses from Google Sheets to HubSpot).
• Remove duplicates from Google Sheet (removes duplicate emails).
• Check updated data in Google Sheet and send to HubSpot (syncs updated data like first name, last name, phone, etc., to HubSpot).
• Remove emails in HubSpot not in Google Sheets (deletes HubSpot emails missing in Google Sheets).
• Remove emails in Google Sheets not in HubSpot (deletes Google Sheets emails missing in HubSpot).
The Google Sheets database includes:
• First Name
• Last Name
• Life Cycle Stage
• Created At
• Last Modified At
• Phone
• ID
Programming Languages
HTML & CSS, JavaScriptWhat's included $150
These options are included with the project scope.
$150
- Delivery Time 5 days
- Number of Revisions 1
- Install Script
- Test Script
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Stefania S.
Jun 30, 2026
TV Subscriptions User Feedback (Poland)
It was really lovely working together, and we really appreciate your prompt responses and diligent work. I hope we can collaborate on similar studies in the future!
The work done will help our client improve their product for users across various European markets.
The work done will help our client improve their product for users across various European markets.
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About Mariusz
EXPERT EMAIL DEVELOPER || Email Marketing Strategist & AI Architect II
99%
Job Success
Opole, Poland - 8:05 am local time
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
Steps for completing your project
After purchasing the project, send requirements so Mariusz can start the project.
Delivery time starts when Mariusz receives requirements from you.
Mariusz works on your project following the steps below.
Revisions may occur after the delivery date.
Apps Script and Hubspot integration
I will create an Apps Script application, install it on Google Sheets, and integrate it with HubSpot using API and webhook.