Cem Ustun

I'm looking for a company that values engineering, trusts its people, and encourages ownership. I want to use my full range of skills, from product thinking and UI/UX to architecture and development, to build great products. Above all, I want to work with passionate people who value quality, recognize good work, and encourage continuous growth. I'm a Senior Product Engineer with a full-stack background and deep expertise in mobile development, specializing in React Native, Expo, TypeScript, and React. I enjoy taking products from concept to production, combining product thinking, UI/UX design, software architecture, and engineering execution to build experiences that people genuinely enjoy using. At Logo Yazılım, I've owned architecture, UI/UX, and delivery across three enterprise product rebuilds, including migrating native Kotlin and Swift applications to React Native, reducing form-related development time by approximately 50%, and delivering a cross-platform warehouse management application for Android, iOS, and Windows ahead of schedule. Previously, at makeSOsimple, I worked across mobile, frontend, and backend engineering for organizations including TEB Faktoring, VakıfBank, Yıldız Holding, DİMES, and TOGG. My experience includes native mobile integrations, API development, legacy modernization, performance optimization, and usability research, with achievements including a platform migration that improved page performance by more than 20x. I also led the development of buum-e, a B2C and B2B loyalty platform built from the ground up. As Technical Lead, I owned product analysis, UI/UX, architecture, and engineering delivery. The platform reached 20,000 users and 1,300 businesses within its first month. I'm particularly interested in product engineering, system design, performance, and technical leadership. I value end-to-end ownership, maintainable architectures, and working closely with teams to turn complex problems into meaningful products.