Senior Software Mobile Engineer

Realization of mobile and web applications in the field of eHealth and the digitization of the health care system with a focus on "Joy of Use".

• Scaled and further developed the customer client app to four-part daily active users and six-digit registrations
• Ensured coding standards by evolving architecture, code reviews, testability and pair programming (clean architecture, MVVM, TDD)
• Increased the bus factor by cross-training / pair programming to nearly full team size on the whole stack
• Participated in user testing sessions as spectator to fully understand user needs
• Increased reliability and availability of the app to in average 99,85% (both platforms) crash free rate
• Interim Lead for new web team, ramped up team and built recruiting website, which increased application rate by factor two
• Took ownership for the project "Online Access Act" to connect 50+ forms to internal systems

• App Store
• Play Store

Child care

Child care in lockdown due to daycare closures.

Freelance Senior Software Mobile Engineer / Interim Tech Lead

Realization of applications in the field of eHealth and the digitization of the health care system with a focus on "Joy of Use".

• Initial creation, scaling and maintaining the VBU app within 1 year to three-part daily active users and five-digit registrations
• Contributed to the hiring process to increase vbu.platform teams size by factor two
• Interim tech lead for vbu.platform as a coach, mentor to further grow and develop engineers on the app and web team
• Large projects were broken down into manageable, parallelizable tasks that could be solved in distinct stories and deliverables

• Project feedback: Roman Scheffler (Head of Platform and Applications)

• App Store
• Play Store

Paternity Leave

Expanding the key skills bouncing, calming, encouraging, doing laundry and getting along with little sleep.

Freelance Senior iOS Developer + Consultant

Maintained an app for a large multinational corporation of nonalcoholic beverage concentrates which was used by a large group of sales representatives in Europe.

• Integrated Salesforce SDK for iOS
• Created extensive documentation for hand-over
• Migration Objective-C to Swift

Freelance Senior iOS Developer + Consultant

Working in an English speaking environment I supported with test-driven implementation of a completely new feature for multi-provider registration.

• Build, integrated and tested multi-provider registration for 20+ car, ride and bike sharing providers
• Introduced testability and gave a workshop about unit and integration testing
• Migration from Objective-C to Swift

Freelance Senior iOS Developer + Consultant

Working in an English speaking environment I supported with test-driven implementation of new product functions for the ImmobilienScout24 App.

• Implemented new feature for real estate valuation within the ImmobilienScout24 App
• Integration of ad tracking
• Migration from Objective-C to Swift

• App Store

Freelance Senior iOS Developer + Consultant

Maintaining an app for a leading German multinational automotive company and applied new features in weekly sprints, performed code reviews.

• Refactoring to increase understandability and testability, reduce dry and common issues
• Being a mentor for junior mobile developers
• Built greenfield project for dentist exhibition

CTO / Deputy Managing Director

Lead (5+ engineers) and manager of various projects (team size 5 - 15) for well-known, multinational and middle-class clients.

• Team lead of 5+ engineers
• Piloted several projects (team size 5 - 15) for multinational clients (e.g. Daimler AG, Porsche AG)
• Project lead for optician products, which revolutionized the optician market by reducing costs by 90% compared to competitor products and won the SILMO d'Or award
• Ensured coding standards and maintainability by evolving architecture, testability and pair programming

• visuReal product page
• SILMO d'Or winner

Founder and CEO

We implemented rich internet applications (RIA) with Flash, Flex and web applications for various national clients.

Freelance Idea Engineering

I worked as idea engineer for the Zephram GbR, moderated workshops and developed product ideas.

Freelancer for RIA and Web Development

Implemented rich internet applications (RIA) with Flash, Flex and Silverlight and web applications for various larger clients.