Hayrullah Kar

@magesheet

Founder & Automation Strategist @MageSheet | Google Apps Script & AI Specialist.

Sakarya,TurkeyJoined May 2026

About

Founder & Automation Strategist @MageSheet. I specialize in building intelligent automation systems and custom CRMs using Google Apps Script and AI to eliminate manual workflows and drive business efficiency.

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Hayrullah Kar's blogs

MageSheet Engineeringmagesheet-team.hashnode.dev29 posts

Articles Comments5

Recently published

HKHayrullah Karmagesheet-team.hashnode.dev22h ago · 3 min read

Stateless No More: Implementing Secure Token-Based Authentication in Apps Script Web Apps

When expanding Google Workspace into a genuine production-grade business platform, developers frequently run into a major architectural roadblock: state management. Google Apps Script’s underlying use

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HKHayrullah Karmagesheet-team.hashnode.dev3d ago · 2 min read

Decouple Your Data: Building Custom Web Applications on Top of Google Sheets

Most tutorials treat Google Apps Script as a basic macro engine for changing cell colors or summing columns. But hiding behind the standard grid layout is a powerful, production-grade cloud infrastruc

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HKHayrullah Karmagesheet-team.hashnode.dev4d ago · 2 min read

Serverless Integration: Building High-Performance Webhook Listeners in Google Apps Script

Many engineering teams rely heavily on expensive, rigid third-party middleware like Zapier or Make.com just to move event data from platforms like Stripe, Magento, or HubSpot into a spreadsheet. But t

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HKHayrullah Karmagesheet-team.hashnode.dev5d ago · 3 min read

Stop Forecasting Blindly: Build a Live External API Demand Engine in Google Sheets

E-commerce inventory forecasting is often like throwing darts in the dark. The biggest trap businesses fall into is relying strictly on backward-facing historical data (last year's sales reports, etc.

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HKHayrullah Karmagesheet-team.hashnode.devJun 27 · 3 min read

Say Bye to Payout Week Dread: How to Build a Secure, Apps Script-Powered Commission Engine in Google Sheets

If you manage a sales team or an affiliate network, you already know the dread of "Payout Week." Reconciling hundreds of micro-transactions, calculating tiered splits, and accounting for refunds is a

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Hayrullah Kar

About

Available for

Hayrullah Kar's blogs

Recently published

Stateless No More: Implementing Secure Token-Based Authentication in Apps Script Web Apps

Decouple Your Data: Building Custom Web Applications on Top of Google Sheets

Serverless Integration: Building High-Performance Webhook Listeners in Google Apps Script

Stop Forecasting Blindly: Build a Live External API Demand Engine in Google Sheets

Say Bye to Payout Week Dread: How to Build a Secure, Apps Script-Powered Commission Engine in Google Sheets

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Hayrullah Kar

About

Available for

Hayrullah Kar's blogs

Recently published

Stateless No More: Implementing Secure Token-Based Authentication in Apps Script Web Apps

Decouple Your Data: Building Custom Web Applications on Top of Google Sheets

Serverless Integration: Building High-Performance Webhook Listeners in Google Apps Script

Stop Forecasting Blindly: Build a Live External API Demand Engine in Google Sheets

Say Bye to Payout Week Dread: How to Build a Secure, Apps Script-Powered Commission Engine in Google Sheets