Sultan Kautsar Get a quote

Founder & Engineer · Yogyakarta, UTC+7

I build reliable websites, marketing technology, and AI-native systems.

75+ websites built and conversion tracking systems deployed for agencies and businesses across Germany and international markets.

Portrait of Sultan Kautsar

Selected Work

Anonymised case studies from tracking, consent and conversion projects.

  1. Privacy-First Tracking for a German Dental Practice Consent & tracking · Healthcare
  2. Consent and Conversion Tracking for a Moving Company Consent & conversions · Moving
  3. Repairing the Tracking Chain for a Yoga School Tracking audit · Yoga education
  4. Tracking Standards for a Performance Marketing Agency Event standards · Agency

In Numbers

75 +
Websites built and maintained
350 +
Clients served since 2020
2018
Building for the web since

Overview

I'm Sultan Kautsar, a Founder & Engineer focused on web engineering, marketing technology, and AI-native development.

I build reliable digital systems across websites, infrastructure, analytics, tracking, automation, and marketing tools.

I choose technology based on the problem and the desired outcome, with a focus on simplicity, reliability, and efficient execution. AI is an active part of my engineering workflow for research, development, debugging, automation, and system design.

More about me

Currently

  • Marketing Technology Engineer MediaConversion, Hamburg Since 2026
  • Software Engineer FlexyPack, Jakarta Since 2025
  • Founder & Engineer Rayatiga Since 2020

Recent Notes

Things I've learned building, measuring and shipping, written down so they stay useful.

  1. How This Site Is Tracked

    How sultankautsar.com is tracked: a hand-built consent banner, Consent Mode V2 in advanced mode, Google Tag Manager, five GA4 events, and a Content Security Policy that only allows Google's tag domains.

  2. Working with Opus 5.5

    How I use Claude Opus 5.5 in Claude Code for client work, company projects, and personal tools: the habits, the review loop, and what nine days of real sessions looked like.

  3. A Circuit Breaker for Amazon SES

    SES Guard, a small CloudFormation stack that watches Amazon SES for sending spikes and high bounce or complaint rates, stops sending automatically, keeps the logs, and alerts Telegram, PagerDuty, and email with who was sending.

  4. Headless CMS for a Brand Site

    A practical headless CMS setup for a company brand site using WordPress and Next.js on RunCloud, with Docker, Supervisor, on-demand revalidation, and scripted release, deploy, and rollback.

Next step

Have a project in mind? Let's talk.

Tell me what you have and what you need. I'll usually reply within one working day with how I'd approach it.