Engineering across the web, marketing, and AI-native work.
I'm Sultan Kautsar, a Founder & Engineer. I build websites, set up marketing technology, and use AI in most of what I do.
I'm Sultan Kautsar, a Founder & Engineer. I build websites, set up marketing technology, and use AI in most of what I do.
I started out building and maintaining websites. Over time the work grew to include the servers they run on, the analytics and tracking behind them, automation, marketing tools, and software.
I've worked on more than 75 websites and helped businesses and agencies with development, maintenance, migrations, technical SEO, analytics, and conversion tracking. Much of that work has been for agencies in Germany, and some for clients in other countries.
I don't have a favorite stack. I start from what the project needs, what it has to work within, and what it should achieve, and pick the tools from there.
I like simple systems and decisions that are written down. A website, a tracking setup, an internal workflow, or a piece of software should be practical, and easy for the next person to maintain.
I use AI at almost every stage of my work: research, planning, writing code, debugging, automation, and system design.
It lets one engineer take on more, and it shortens the time from an idea to something running in production. I still review what it produces, and the decisions stay mine.
Feb 2026 – Present
Hamburg, Germany · Remote
Building tracking infrastructure for European businesses: custom data layers, GA4 and Google Ads integration, and GDPR-compliant setups with Consent Mode V2.
Sep 2025 – Present
Jakarta, Indonesia · Onsite
Developing internal Odoo systems, mobile sales applications, and career platforms for an e-commerce packaging company.
Mar 2020 – Present
Self-employed · Remote
Served 350+ clients with website creation, maintenance, migration, Google Tag Manager, and SEO services. Every package includes free maintenance.
May 2023 – Sep 2025
Jakarta, Indonesia · Onsite
Maintained website performance, provided technical support, and built custom sites from UI/UX designs alongside designers and marketing teams.
Feb 2022 – Jul 2022
Jakarta, Indonesia · Remote
Built Android backends and managed Google Cloud resources (Vertex AI, App Engine, Cloud SQL). Graduated with distinction.
Next step
Tell me what you have and what you need. I usually reply within one working day with how I'd approach it.