# Sebastian (@sebastian.eurosky.social)

Profile: https://sifa.id/p/sebastian.eurosky.social

## Career

- **Co-Lead at Eurosky** (May 2025 - Present)
- **CEO at Birdsong Apps GmbH** (Jan 2025 - Present)
  Berlin, Berlin
- **Freelancer at -** (Sep 2007 - Present)
  Berlin und Umgebung
- **M.-Sc. Working Student at Morgen Studios** (Feb 2007 - Aug 2007)
  Berlin
  Working Student (M.Sc.)
- **Software-Development & Systemadministration at Institute for Mathematical Stochastics** (Jun 2001 - Jul 2005)
  Göttingen
  Software Development & System-Administration

## Projects

- **Skeets for Bluesky** (May 2023 - Present)
  Native Bluesky client for iOS / iPad  Features:
  \- Bookmarks
  \- Drafts
  \- Mute Words
  \- Rich Push Notifications
  \- Hashtags
  \- Alt-Text Generator
  \- Accessibility / VoiceOver Support  https://www.skeetsapp.com
- **MotionTag iOS App** — https://motion-tag.com (Jun 2016 - Present)
  iOS App for Mobility Analytics and Seamless Ticketing.
- **FontBook iOS App** — http://fontbook.com (Jun 2016 - Present)
  Weiterentwicklung der iOS App.
- **Cartier AR iOS App** (May 2016 - Present)
  Augmented Reality app (internal) that would display several locations of a Cartier summit in Berlin.
- **DFB #JederFuerJeden iOS App** — http://www.apprime.de/dfb-die-mannschaft-jeder-fuer-jeden-app-online-game/ (May 2016 - Present)
  Unterstützende Entwicklung.
- **Talents Connect** — https://www.talentsconnect.com (Sep 2015 - Present)
  Consulting for Talent Connect's iOS app
- **Solarkiosk - Custom Project Management Software** — http://solarkiosk.eu (May 2015 - Present)
  Internal project management tool based on Ruby on Rails.
- **visitBerlin iOS App** — https://itunes.apple.com/de/app/id964438630 (Oct 2014 - Present)
  Unterstützende Entwicklung.
- **Modalyzer iOS App** — https://www.modalyzer.com (Jul 2014 - Present)
  A mobility tracking app.
- **SanKyu** — http://www.sankyu.com (Feb 2013 - Present)
  System Architecture & Software Development, Interface Design  Technologies: Ruby on Rails, Reddis, HTML 5
- **Friends' Events for Facebook iPhone App** — http://itunes.apple.com/us/app/friends-events-for-facebook/id494982353?mt=8 (May 2011 - Present)
  iPhone App that displays all events that your friends will be attending in the near future.
  
  Technologies: Objective-C, iOS, Facebook Integration
- **Hypercharge PCI-Certified Payment Gateway (Ruby on Rails)** — http://www.a1m.biz (Jan 2010 - Present)
  A modern, agile payment gateway based on ruby on rails technology. The secure bridge between your E-Commerce Web site and the credit card processing networks. PCI DSS certified by Visa and Mastercard.
  
  Complete System Architecture & Software Development of the Hypercharge Payment Gateway, Interface Design  Technologies: Ruby on Rails, Reddis, HTML 5
- **Quirion iOS App** — https://www.quirion.de (Oct 2016 - Sep 2017)
  iOS Banking / Robo Advisor App.
- **Tungsten iOS App** — https://tungstenapp.com (Sep 2016 - Jan 2017)
  Secure messaging iOS App. Unterstützende Entwicklung.
- **iNamnese iOS App & Backend** — https://devicon.de/inamnese/ (Aug 2015 - Mar 2016)
  Backend in Ruby on Rails zur dynamischen Erstellung von Anamnese Formularen in versch. Sprachen, inkl. digitaler Signierung.
  
  iOS App zur Darstellung/Ausfüllen der Formulare durch den Patienten.
- **Simfy next iOS App** — https://itunes.apple.com/de/app/simfy-next/id600461545?l=en&mt=8 (Apr 2013 - Jan 2016)
  iOS App Technologies: ObjectiveC, iOS
- **Zalando iPhone App** — https://itunes.apple.com/de/app/zalando-mobile/id585629514 (Jan 2012 - Aug 2013)
  Concept, design and implementation/programming of Zalando's iPhone App   https://itunes.apple.com/de/app/zalando-mobile/id585629514
- **Wall AG  - bluespot City Info iPhone/iPad App** — http://itunes.apple.com/app/bluespot-city-info/id560122086# (Jun 2012 - Sep 2012)
  Backend, iPhone App Technologies: Ruby on Rails, ObjectiveC, iOS
- **MAN IAA 2012 iPhone App** — http://itunes.apple.com/us/app/man-iaa-2012/id561002434?ls=1&mt=8 (May 2012 - Aug 2012)
  Backend, iPhone App, Interface Design Technologies: Ruby on Rails, ObjectiveC, iOS, Augmented Reality
- **KaDeWe iPhone App** — http://itunes.apple.com/de/app/kadewe-app/id508772555?mt=8 (Dec 2011 - Mar 2012)
  iPhone App for the KaDeWe Berlin.
  
  Technologies: ObjectiveC, iOS
- **Raceunion iPhone App** — http://itunes.apple.com/us/app/raceunion/id437234607?ls=1&mt=8 (Dec 2011 - Jan 2012)
  Backend, iPhone App Technologies: Ruby on Rails, ObjectiveC, iOS
- **PicTrip iPhone App** — http://itunes.apple.com/de/app/pictrip/id470563161?mt=8 (Oct 2011)
  iPhone App that lets you create rapid slideshows.
  
  Technologies: Objective-C, iOS
- **Oncology Guideline iPhone & Android App** — http://itunes.apple.com/de/app/leitlinien-onkologie/id453786520?mt=8 (Jun 2011 - Jul 2011)
  Backend, iPhone & Android App for the German Cancer Association  Technologies: Backend, iPhone App, Android App, Interface Design
- **eMerchantPay E-Wallet** (Feb 2011 - Jun 2011)
  FSA-certified E-Wallet solution for the PSP eMerchantPay  Web-App (Ruby on Rails), Interface Design  Technologies: Ruby on Rails, HTML 5, Reddis, Hypercharge Integration, Postgres
- **teNeues Cool City Guides iPhone & iPad Apps** — http://itunes.apple.com/de/artist/teneues-digital-media-gmbh/id429952977 (Jan 2011 - May 2011)
  Backend, iPhone/iPad Apps Technologies: Ruby on Rails, Objective-C, iOS
- **Stylebop iPhone App** — http://itunes.apple.com/us/app/stylebop-shopping-app/id432512739?mt=8 (Feb 2011 - Apr 2011)
  iPhone App, Interface Design Technologies: Objective-C, iOS
- **MAN Truck & Bus iPhone App** — http://itunes.apple.com/us/app/man-truck-bus/id436123140?mt=8 (Jan 2011 - Apr 2011)
  Backend, iPhone App, Interface Design Technologies: Ruby on Rails, ObjectiveC, iOS
- **MAN Truck & Bus iPad App** — http://itunes.apple.com/us/app/man-truck-bus-hd/id436814342?mt=8 (Jan 2011 - Apr 2011)
  Backend, iPhone App, iPad App (HD), Interface Design Technologies: Ruby on Rails, ObjectiveC, iOS
- **Viessmann Mobile Web App** — http://m.viessmann.de (Feb 2011)
  Backend, Mobile Web-App, Interface Design Technologies: Ruby on Rails, HTML5
- **MAN IAA iPhone App 2010 - Backend** (Jun 2010 - Jul 2010)
  Backend, Mobile Web-App, Interface Design Technologies: Ruby on Rails, HTML 5
- **Samsung Erfolgswelle** (2010 - May 2010)
  Web-App Technologies: Ruby on Rails, HTML 5, Salesforce Integration
- **Entega - “Rettet den Schneemann”** (Dec 2009 - Jan 2010)
  Web-App Technologies: Ruby on Rails, HTML 5, Facebook/YouTube/Twitter Integration
- **VeeQue** — http://www.veeque.biz/veeque.html (Jun 2009 - Dec 2009)
  System Architecture & Software Development of the VeeQue System, Interface Design Technologies: Ruby on Rails, Quicktime C API, AMQP, Rabbit MQ
- **DOUBLE STANDARDS Website** — http://doublestandards.net

## Publications

- Untitled — sebastian.pckt.blog (Mar 2026) https://sebastian.pckt.blog/untitled-r5smuz7
- Digital cocaine: Why a social media ban for teenagers is not enough — sebastian.leaflet.pub (Nov 2025) https://sebastian.leaflet.pub/3m6ufpq7axc2u
- Social Media is critical infrastructure — sebastian.leaflet.pub (Nov 2025) https://sebastian.leaflet.pub/3m6tkj3thes2i
- Title for this test — sebastian.leaflet.pub (Oct 2025) https://sebastian.leaflet.pub/3m27athalds2e

## Skills

### Technical
- atproto
- Git
- iOS
- iOS development
- iPhone
- Mobile Applications
- Objective-C
- PostgreSQL
- REST
- Ruby
- Ruby on Rails
- Software Development
- Swift (Programmiersprache)
- Test Driven Development
### Creative
- User Experience
### Other
- Agile Methoden
- Back-End-Webentwicklung
- Barrierefreiheit
- Creator
- Datenschutz
- Digitale Barrierefreiheit
- Flashes for Bluesky
- iOS Entwicklung
- iPhone development
- Mobilanwendungen
- Softwarearchitektur
- Softwareentwicklung
- Soziale Medien
- SwiftUI
- W3C Accessibility

## Education

- **Georg-August-Universität Göttingen** — M.Sc. (2001 - 2007)

## Languages

- German (native)
- English (full professional)
- French (limited working)
- Spanish (elementary)