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Tamer KÖŞE

Pendik, Istanbul, Turkey|+90 541 410 4667|[email protected]|LinkedIn: Tamer KÖŞE|github.com/tamerks|tamerkose.com

Summary

Software engineer with 3+ years of production React Native, owning App Store / Play Store / Huawei AppGallery release cycles. Founder of App Branch — an indie mobile app studio shipping Astraea (PCOS & period tracker) and Smart Scan X (PDF toolkit) on iOS, designed and built end-to-end in React Native + Expo. Strong on real-time mobile (WebRTC), native-module integration (Swift, Kotlin/Java), and AI-assisted full-stack delivery (Next.js + Supabase, Python automations, OpenAI flows).

Technical Skills

  • Mobile: React Native, Expo, TypeScript, Swift, Kotlin / Java, Native Modules, iOS Development, Android Development, Huawei AppGallery, App Store / Play Store deployment, Push Notifications, Biometric Authentication
  • Web: React, Next.js, TypeScript, TailwindCSS, Redux Toolkit, React Query, GraphQL
  • Backend / Data: Node.js, REST APIs, Firebase, Supabase, PostgreSQL, MongoDB | AI: OpenAI (chat + vision)
  • Tools: Git, CI/CD, GitHub Actions, Vercel, Cloudflare, Docker, App Store Connect, Google Play Console

Professional Experience

App Branch, LLC — Newark, DE (remote, run from Istanbul)

Founder & Engineer | 06.2025 – Present

Stack: React Native, Expo, TypeScript, Supabase, OpenAI (chat + vision), App Store Connect

  • • Founded App Branch in June 2025; operate the full studio cycle solo — product, code, App Store submissions, and marketing sites (appbranch.co, pcoshealth.app, documentscan.co).
  • • Astraea (App Store) — PCOS-first cycle and symptom tracker with photo-based AI nutrition scoring. React Native + Expo + Supabase + OpenAI; anonymous-by-default, encrypted health-data architecture.
  • • Smart Scan X (App Store) — document scanner and PDF toolkit (OCR, ID-card front/back PDF mode, AirPrint). React Native + Expo with community modules; no custom native code.

INTIME INFO SOFTWARE SOLUTIONS — Istanbul, Turkey

Software Engineer / React Native Developer | 04.2023 – Present

Stack: React Native, TypeScript, WebRTC, Redux, Firebase, SQLite, Swift, Kotlin/Java, GitHub Actions

  • • Develop and maintain the İntime İK super-app on production for App Store, Play Store, and Huawei AppGallery — HR, PDKS, expenses, tasks, surveys, and CRM modules.
  • • Built native modules (Swift, Kotlin/Java) and integrated third-party SDKs for location, push, biometrics, and payment flows.
  • • Implemented real-time messaging and 1:1 audio/video calling using WebRTC.
  • • Optimise performance and reduce crash rates through systematic debugging, profiling, and refactoring.
  • • Set up CI/CD for automated builds, tests, and triple-store deployments; mentor juniors and lead mobile-team code review.

WHOMII — Istanbul, Turkey

React Native Developer | 03.2022 – 01.2023

Stack: React Native, Expo, Firebase, Redux Toolkit, MongoDB, SQLite, Axios

  • • Built and shipped the Whomii bilingual (TR/EN) psychology and mental-wellness app to App Store and Google Play.
  • • Implemented complex state management for chat-style real-time interactions; integrated Firebase services and push notifications.
  • • Integrated payment gateways and subscription management.
  • • Worked closely with designers to deliver pixel-perfect mental-health onboarding flows.

Education

Maltepe University — Istanbul, Turkey | BSc, Software Engineering (English-instruction program) | 2017 – 2022

Additional

Languages: Turkish (native), English (professional).