# Mousa Amin Sharifi

> iOS engineer based in Cologne, Germany. Builds features for Parship, eharmony and ElitePartner at PE Digital, and designs, builds and publishes his own iPhone apps under the name Applestan.

Updated October 2026.

## About

- Role: iOS Engineer at PE Digital (Hamburg), since July 2023. Swift, SwiftUI, UIKit, Combine, Swift Concurrency (async/await, AsyncStream), XCTest and Swift Testing, MVVM, VIP and Coordinator patterns, CI/CD with GitHub Actions and Fastlane.
- Before: Perfect-iD GmbH in Cologne (2021–2023: iCloud storage, Realm, camera and image-to-text features), arconsis in Karlsruhe (student work, 2020–2022), App-Tec (2019), freelance iOS development (2016–2019).
- Education: MSc in Communication and Media Engineering, Hochschule Offenburg (grade 1.7; thesis on contemporary UI/UX design for different mobile operating systems). BSc in Information Technology Engineering, Azad University, Qazvin.
- Languages: Persian (native), English (advanced), German (A2).
- Building for iPhone since 2016.

## Apps (all for iPhone, on the App Store)

- [Stamp Days: Country Tracker](https://heymousa.com/stampdays/): counts the days you spend in every country, automatically, in the background. World map, trip history, On this day, widgets, export. Free, with an optional one-time Pro unlock. App Store: https://apps.apple.com/app/id6811356388
- [Pupport: Dog Passport, Vaccine](https://apps.apple.com/app/id6811412018): turns a destination's pet travel rules into a checklist with real dates, for people taking their dog abroad. Free for one dog; one payment unlocks everything, no subscription.
- [DiceCraft: Board Game Roller](https://apps.apple.com/app/id6758661829): every die for board game nights and tabletop RPGs.
- [Timeflip - Clock Challenge](https://apps.apple.com/app/id6757277572): a brain game about reading analog clocks that are mirrored or flipped.
- [PlotCraft: Graphing Calculator](https://apps.apple.com/app/id6757267041): a graphing calculator built for clarity, speed and simplicity.

## Writing

- [I built and launched this website in one day](https://heymousa.com/blog/built-this-site-in-a-day/) (October 10, 2026): building heymousa.com with Claude Code as a pair programmer and the Impeccable and Emil Kowalski design skills; moving from Firebase Hosting to Cloudflare (static assets, no traffic cap), a Cloudflare-registered domain, Email Routing, a spam-safe email link, cookieless Cloudflare Web Analytics instead of Google Analytics, and getting listed with Google Search Console, Bing and IndexNow.
- [Three small App Store lessons from shipping Pupport 1.2](https://heymousa.com/blog/app-store-lessons-pupport-1-2/) (October 8, 2026): keep pricing words out of screenshots (Guideline 2.3.7), write App Review notes for the current version and name the in-app purchase (Guideline 2.1(b)), and test promoted in-app purchases end to end (StoreKit PurchaseIntent) before switching them on.

## Links

- Website: https://heymousa.com/
- LinkedIn: https://www.linkedin.com/in/mousa-amin-sharifi-64512510b/
- GitHub: https://github.com/mousash
- Contact: through the "Say hi" section of the website.