Hire the Best Google Apps Script Freelancers
in Poland

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

The only way to make a success of your AI project: Stable Infrastructure & data flows - Programmed Automations - AI API Integration - AI Agents and RAGs Google Apps Script is the best tool to automate your business processes. Zero operation costs. Google-guaranteed security and stability. We practice AI-assisted development (Google Antigravity, VSCode, Gemini Pro, Claude Code, Codex, Cursor, Copilot, etc.) with full human review of every outcome. We build our own AI agents and RAGs; we work with MCPs — and we can build all of that for you too. Zapier, n8n, and Make are fine for basic tasks — but as soon as you need deep integration, they fall short. And they cost money. Get in touch through direct message, invite me to your project, or book a consultation! ⌛ We will help you save your time! Sound familiar ❓ ⭐ You have a workflow that uses Sheets, Docs, Gmail, Calendar, Drive — and at some point you thought: "this should just happen automatically." ⭐ So you Googled it. Every answer pointed to Zapier, Make, or n8n. You signed up, watched a few videos, built something that almost worked — and hit a wall the moment your use case got slightly specific. ⭐ You asked ChatGPT to help. It gave you a confident answer. You followed it step by step. It didn't work. You asked again. It gave you a different confident, detailed answer. That didn't work either. Two hours became an evening. ⭐ You tried a few more things, spent some money on a paid plan to unlock a feature you needed, and eventually got something running — something fragile, something you don't fully understand. ⭐ At some point you got a hint: Google Sheets and Drive live in the same ecosystem and talk to each other natively. ⭐ You looked into Google Apps Script. It seemed powerful. It also seemed like code. You asked AI to write it for you. It wrote something. It didn't run. You debugged for a while, then closed the tab. ⭐ Now you have a half-working Zap, a script that does 60% of what you need, a growing subscription bill, and a nagging feeling that someone who actually knows what they're doing would do a better job. ⭐ That's where I come in. What I can do for you ❓ ⭐ Help you formulate project requirements, even if you aren't sure about them yet ⭐ Talk through all the details of your idea and put together an initial implementation plan ⭐ Identify potential shortcomings, technology limitations, and help you set priorities ⭐ Clearly point out what needs to happen before we start and after we finish All projects are "technically possible" — but not all are "cost-effective" or "reasonable." How we will do this ❓ 🔥 Initial stage: detailed analysis and planning (kick-off meeting, workflow mapping, project plan) 🔥 Preparation: share necessary resources and account access, sign the contract and NDA if needed 🔥 Data foundation: we structure and clean your data first. We organize it properly and set up retention pipelines so everything downstream is reliable. 🔥 Deterministic automation: once the data is solid, we build rule-based automations that handle the predictable, repeatable work. These don't need AI — they just need to be correct, fast, and dependable. 🔥 AI integration: only at this stage do we bring in LLMs — where they actually add value. Natural language interfaces, intelligent triage, summarisation, anomaly detection, generative outputs. 🔥 Ongoing review: you review developments and provide feedback throughout 🔥 Testing: once development and corrections are complete, you test everything end to end 🔥 Delivery: final corrections, bugs squashed, project concluded 🔥 Aftercare: bugs found later are fixed for free; new ideas become new milestones. How can you be sure ❓ Scroll down and read the feedback from our clients. All words are genuine, all people and companies are real and verified by the platform. Can we show examples of our work ❓ General descriptions — yes. Code or data — no. Most of our work is proprietary and covered by NDAs. Let's get in touch through direct message, invite me to your project, or book a consultation! API integrations we have worked with: Google Workspace, AI Studio, Claude Code, SDLC, JSON, XML, Markdown, Google Sheets, Calendly, GoHighLevel, Codex, AI agents, RAG, MCP, Multi-agent systems, Google Docs, Stripe, Asana, Jira, Slack, Cloud Storage, QuickBooks, HubSpot, Monday, OpenAI API, Gemini API, Firebase, Firestore, GitHub, Harvest, ClickUp, Cerbo, Intercom, Trello, WordPress, Facebook Atlas, Upwork, GMB, Gmail, Tableu, Airtable, Google Calendar, Google Places, Google Place Details, Google Maps, Google Business Profile, GA4, Google Analytics, Google Ads, Typeform, Instapage, CryptoCompare, Bittrex, Invenias, EOD Historical Data + others.

👋 I help businesses automate manual processes and connect their tools — building reliable systems with Excel, Google Sheets, VBA, Google Apps Script and custom API integrations. I'm also a finalist of the Excel World Championship (3rd globally in 2024, 7th in 2023). If disconnected tools, repetitive manual work, or messy spreadsheets are slowing you down, I build solutions that fix that — and keep working long after the project ends. 🏆 Competitive Excel background Placing 3rd worldwide in the Excel World Championship means I'm comfortable with complex logic, large datasets, and performance-critical builds. You get solutions that are efficient and robust, not just functional. 🔗 What I specialize in 📌 API integrations — connect CRMs, marketing platforms, payment tools, and internal systems so your data flows automatically 📌 Process automation — replace manual, error-prone tasks with reliable workflows (VBA, Google Apps Script, no/low-code) 📌 Spreadsheet solutions — custom Excel & Google Sheets tools built around your exact workflow 📌 Dashboards & reporting — clear, decision-ready insights pulled together automatically 📌 Fixing & optimizing existing files or systems that are slow, fragile, or hard to maintain 🚀 I also build custom apps and lightweight internal tools / CRMs for teams that have outgrown spreadsheets — reach out if that's where you're heading. 👉 Not sure what should be automated yet? No problem. If a process feels messy, slow, or unclear, I'll map it out with you, break it down step by step, and recommend what's worth automating — and what isn't. ✅ What you get working with me ✅ Time savings — less manual work, more focus on what matters ✅ Accuracy & consistency — fewer errors through automation and validation ✅ Clear reporting — dashboards built for decisions, not decoration ✅ Cost efficiency — better processes instead of more headcount ✅ Tailored solutions — built for your business, not a generic template ⚙️ Examples of projects I can help with 📊 Automated Excel / Google Sheets reporting systems 🔗 API integrations between your tools and data sources (marketing, payments, CRMs, etc.) ⚙️ Custom VBA macros & Google Apps Script automations 💰 Pricing calculators with client-ready PDF generation 📧 Mass email & notification tools 🔄 No-code / low-code integrations between systems 🧩 Custom system-to-system data pipelines 🛠️ Internal tools & lightweight CRM / app builds 🎓 Excel & automation training for you or your team I'm reliable, detail-oriented, and focused on solutions that hold up long-term — not quick hacks. Communication is clear, timelines are respected, and I'll flag improvements beyond the original scope when they'll genuinely help. If you want to simplify your workflows and automate the boring stuff, reach out — I'd be glad to discuss your project and propose the right solution.

✅ Available now "Tomasz is absolutely amazing at his work. He is very detailed, asks the right questions, and communicates well. He even found flaws in what I had requested and made sure to fix them before delivering the product. I was very happy with his work and hope to work with him again!" - Ali B. ⭐⭐⭐⭐⭐ - Google Sheets, Google Docs, Google Drive, Gmail automations (Apps Script) - Google Sheets scripts and macros (Apps Script) - Custom Google Sheets & Excel products such as databases, trackers, calculators, dashboards and templates - Google Forms and TypeForm forms connected to Google Sheets - Google Sheets solutions leveraging the powerful QUERY and ARRAYFORMULA formulas and arrays - Airtable databases Tech stack: 📊Spreadsheets/databases: Google Sheets, Apps Script, Microsoft Excel, Airtable 💸CRMs: Hubspot, Sugester, Salesforce 🧑🏻‍💻Tools: Google Workspace, Microsoft 365, Slack, Notion, Trello, Jira, Calendly, and more