Looking for a job

Cem Ustun

@cemustun

Full-stack, product-oriented software engineer who loves building great mobile experiences, architecting systems from the ground up and scaling them.

Turkey

Message

What I'm looking for

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.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Logo Yazılım via D1Tech

Jul 2024 - Present (2 years 3 months)

At Logo Yazılım, I owned mobile architecture, UI/UX, and delivery across three major product rebuilds. I migrated native ERP apps to React Native and Expo, reduced form development time by 50%, delivered a cross-platform warehouse management system for Android, iOS, and Windows ahead of schedule, and modernized the customer and business partner portal.

Technical Lead / Product Engineer

buum-e

Jan 2024 - May 2025 (1 year 4 months)

Led buum-e from concept to launch as Technical Lead and Product Engineer, owning product strategy, UI/UX, architecture, and engineering delivery. Led a small team to build a B2C/B2B loyalty platform in two months, reaching 20,000 users and 1,300 businesses in its first month. Continued shaping product and technical decisions after transitioning ownership.

Senior Software Engineer

makeSOsimple

Jan 2021 - Jul 2024 (3 years 6 months)

At makeSOsimple, I led mobile rebuilds and delivered full-stack products for major clients including TEB Faktoring, VakıfBank, Yıldız Holding, DİMES, and TOGG. My work spanned React Native, backend architecture, UI/UX research, and legacy modernization, including a 20x performance improvement for VakıfBank and high-traffic digital campaigns for TOGG.

React Native TypeScript PostgreSQL React Next.js Gatsby Angular .NET Java Expo ThreeJS NodeJS Astro MS SQL Server API Design System Design UI UX Design Kotlin Swift

Software Engineer

makeSOsimple

Jan 2019 - Jan 2021 (2 years)

At makeSOsimple, I developed full-stack products for Adidas/Beşiktaş JK, İstanbul Metropolitan Municipality, Mox Bank, and Ela Hotels. I architected a citywide construction-tracking platform, built a logistics portal with real-time tracking and CRM, modernized its React Native app, and delivered interactive campaigns and CMS-driven websites, including one featured in Gatsby's showcase.

React Gatsby .NET UI UX Test Driven Development Domain Driven Design ThreeJS

Finance & Risk Assessment Module

T.C. Ulaştırma Bakanlığı

Apr 2020 - May 2020 (1 month)

Extended an infrastructure project-management platform with financial planning and automated risk assessment, enabling executives to monitor project status and projected financial risk.