I'm Carsten,
full-stack mobile freelancer
specialized in iOS, Django and AWS.

About Me

I've been into professional software development since 2009 with experience in various industries (travel, gaming, enterprise consulting).

Working in solo environments as well as larger teams I have been in all kinds of company sizes and types such as agencies, start ups and enterprise.

Get in touch


Amazon Web Services iOS Django Swift Python

Former Projects

(a selection)

Contact Me

Feel free to contact me via e-mail


or find me here:

Secret Escapes

Sole developer of the native iOS app (version 3.x) and in-house consulting for mobile related topics, such as app life cycle and mobile UX.

Also, setup of an automated translation workflow based on Fastlane in conjunction with translators and copywriters.

  • Objective-C
  • Swift
  • CoreData
  • Analytics
  • A/B Testing
  • Translation management
Secret Escapes Close Project

Boehringer Ingelheim

As DevOps engineer I helped the client to deploy multi cloud infrastructure in a compliance-critical environment.

Design, development and deployment was realized via tested units of Terraform modules ('blueprints'). The testing was implemented in InSpec with additional Azure SDK-based tests in RSpec.

  • DevOps
  • Terraform
  • Microsoft Azure
  • InSpec / RSpec
  • Cloud Infrastructure Testing
Boehringer Close Project

Ernst & Young

Architecture requirements assessment & interface design between corporate backend(s) and SAP HANA.

Design and development of prototype and showcase apps. Enabling other teams for mobile prototype develop- & deployment.

  • Amazon Web Services
  • Swift
Ernst & Young Close Project

Melbourne Polytechnic

Development of an iPad app for an interactive installation to be used by potential students in the stores.

Users 'picked' courses via a gesture on a TV screen and threw them towards an iPad located next to the installation. The devices were used to provide further information and pick up required information from the students.

Blog post and Demo.

  • Swift; Objective-C
  • WebSockets
  • Kinect
Melbourne Polytechnic Close Project

Grey Innovation

Research sprint for a supporting application of a medical device to monitor blood sugar levels.

Focus was on research ways to reliably contact care persons (e.g. parents) on their mobile device when the measured blood values exceed a certain threshold.

Another task was laying groundwork (serverless environment via Parse) for a hand-over to the Two Bulls colleagues to implement the app.

  • Swift
  • VoIP
  • Serverless
Grey Innovation Close Project

vitaliberty GmbH

Research spike to explore furture usage of HealthKit and Siri capabilities (via SiriKit and Siri Shortcuts) for the FiTS app.

Focus in HealthKit was reading and using existing data to personalize the user experience without the need of submitting data to a remote server.

  • HealthKit
  • SiriKit
  • Swift
Grey Innovation Close Project


Building of native components and games including Tribal Wars 2 & Grepolis.

Designed and developed multi-project payment framework for mobile games.

  • Objective-C
  • Cocos 3d
  • WebSockets
  • Adobe Air
Innogames Close Project

Two Bulls

Technical lead of the Berlin office. Worked with various customers in Berlin, Melbourne and New York.

Worked on projects in the fields of IoT, Augmented Reality, Social Networks and others.

Managed cross-functional teams. Technical evangelist for iOS related topics.

  • Swift
  • Objective-C
  • Python
  • Django
  • Node.js
  • Vuforia AR
  • AWS solutions architect
Two Bulls Close Project