Not an agency. One developer, the whole stack.

Hasan Cemil Acar works as rentonhead — a software developer who designs, builds, sells and hosts software for businesses: from the data model and interface to production code and the servers it runs on.

He works between Istanbul and Moscow with businesses and collaborators internationally. The practice spans native iOS with Swift and SwiftUI, React Native, TypeScript platforms with Next.js and NestJS, Laravel, commerce systems with custom payment integrations, and self-hosted infrastructure.

Every product is designed in Figma by the same person who writes the code — so interfaces stay practical — and data models, realtime flows, permissions and deployment are planned together and kept running after launch.

rentonhead is the international practice. Business services in Türkiye run under RentonDiji; the Turkish personal profile lives on HasanCemilAcar.com.tr.

Direct answers

Who is rentonhead?

rentonhead is Hasan Cemil Acar’s second name — his developer alter ego. Under it he builds and sells software for businesses, working between Istanbul and Moscow.

What can I buy?

Ready products — restaurant POS & SaaS, QR menus, an ordering app, delivery operations and school payments — or custom software: iOS and Android mobile apps, e-commerce websites, WordPress and WooCommerce builds, web applications, admin panels, and payment and courier integrations.

Which technologies?

Swift, SwiftUI, TypeScript, React, Next.js, React Native, NestJS, Laravel, PHP, WordPress, PostgreSQL, MySQL, Redis and Docker — chosen to fit the product.

Does he work internationally?

Yes. Work is done remotely in English, Russian or Turkish, in the UTC+3 time zone.

How are the three websites related?

rentonhead.dev is the international practice, HasanCemilAcar.com.tr the Turkish personal profile, and RentonDiji serves businesses in Türkiye.