• Developed a stock trading app for iOS and Android with optimised performance and user experience
• Designed a scalable white-label app architecture for banks and financial institutions
• Refactored deprecated libraries, enhancing code stability and modern compatibility
• Consulted on security to ensure compliance and safeguard against vulnerabilities
• Implemented CI pipelines, streamlining workflows and accelerating deployments

• Personally manage and develop mobile app projects from concept to release.
• Provide IT consulting services to clients, focusing on digital strategy and optimisation
• Oversee all aspects of company operations, including business development and client relations

• Developed Moovility and EVN apps for iOS and Android, including CarPlay and Android Auto integration
• Defined APIs, managed releases, and conducted end-to-end testing
• Supported the company with IT security consulting to enhance app and infrastructure security

• Developed a B2B iOS app for e-bike dealers and mobility fairs, supporting inventory management, event registration, and product testing for items like e-bikes and climbing equipment
• Implemented CRM and inventory management systems to optimize dealer operations
• Digitalized the process of managing event and test ride registration, product reservations and ride time tracking for seamless event execution
• Developed guest registration websites for major cycling events, including Eurobike and E-Bike Days and integrated them with the iOS app
• Created survey management features and designed and implemented public APIs for customer use using node.js
• Integrated external services such as Smartsheet and SurveyJS using custom webhooks
• Provided consulting in digital transformation and process optimization, enhancing operational efficiency
• Provided DevOps and maintenance support for cloud services on Google Cloud and Firebase, ensuring reliable performance and scalability.

• Developed various iOS apps, including HNGRY, Components, and Smart Device 2.0
• Designed a modern app architecture using SwiftUI, Combine and async/ await
• Mentored junior developers and led cross-team training sessions and tech talks

• Developed the DAK iOS app, focusing on the Bonus section
• Refactored code from RxSwift to Combine for enhanced performance
• Conducted feasibility analysis of UX designs to ensure optimal user experience and app functionality

• Led development for ryd mobile apps and managed cross-team coordination
• Rewrote the iOS app from Objective-C to Swift using MVVM architecture
• implemented new features for iOS and Android apps
• Rebuilt the Android app from Java to Kotlin, incorporating a modern architecture to enhance maintainability and scalability
• Built a Kotlin Multiplaqorm framework for the payment module to streamline cross-plaqorm development
• Recruited and built the mobile app team, overseeing project and team management
• Defined API documentation, coding guidelines, and set up CI pipeline automation
• Mentored and coached app developers, facilitating onboarding and cross-team training

• Technical Lead & Developer (ryd mobile Apps)
  • Recruiting & building up the mobile app team
  • Rewriting and modularisation of IOS app.
  • Definition of API documentation and coding guidelines
  • CI pipeline setup and automation
• Project Management
• Mentoring / onboarding app developers

Free time project to experiment with React Native technology.

The app reads from a public api today's, tomorrow's and yesterday's horospoce for the desired sun sign.

In addition to horospoce, zodiac's mood on that day as well some key words describing his personality are also presented to user.

So far the app has been released only for iOS and I'm currently working on the Android release and an Apple TV version.

[Link auf Anfrage]

• Designed and developed a custom Order Management System (OMS) including REST API, iOS, and Android applications, and a web-based admin tool from scratch
• Implemented a custom OMS to streamline order processing and inventory management across multiple plaqorms
• Supported the client in digitalising their order flow, transitioning from email-based processes to a more efficient, integrated system
• Developed and integrated apps and the web admin tool with the OMS API to ensure seamless operation
• Provided customer consulting services on security, digital transformation and process optimisation to enhance operational efficiency

• Served as Lead Developer and Architect for the S5 internal ticketing system
• Developed REST APIs using PHP Symfony 3 and implemented features for iOS and Android apps
• Acted as interim Scrum Master, facilitating agile processes and team coordination
• Created an "iOS App Prototyping KIT" to streamline app development
• Mentored the winning group in the "MS Business Hackathon 2017" and provided guidance to other app developers
• Provided mentoring and training to junior developers

• Served as iOS Team Lead and Architect for the consumer loan credit division, overseeing the development of native iOS apps for loan application and document management
• Led the transformation of a web application into a fully native iOS app to improve performance and user experience
• Designed and implemented APIs for responsive websites and apps
• Developed an XSD to Swift code generator and mapper using Java SE, enhancing development efficiency
• Mentored and onboarded junior developers and conducted internal ?Tech Talks? to share knowledge and best practices

• Managed project and release cycles for the DriveNow iOS app
• Led maintenance and enhancement of the DriveNow Windows Phone app
• Implemented the DriveNow Apple Watch app

• Oversaw project and release management for the myDriver iOS app
• Designed RESTful APIs and managed CI/CD pipelines using Jenkins
• Collaborated with and supported external developers to ensure seamless integration and development consistency

• Developed and maintained various iOS apps, including iSixt, Sixt Mobility for BMW, and Sixt Leasing
• Led the development of iBeacon projects (iOS MVPs) and an indoor navigation app for airport parking garages
• Implemented location-based advertising features for the iSixt app

• Developed and designed mulLple VoIP and messaging apps for iOS, including forfone and toolani
• Focused on creaLng user-friendly interfaces and enhancing app funcLonality to improve user experience

• Contributed to the development of ALDI TALK and AY YILDIZ apps for both iOS and Android plaqorms
• Conducted feasibility analysis for mobile app projects for E-Plus, providing insights and recommendations for project execution

• Developed a "PC controllable washing machine model" with a remote-control application
• Designed the PCB for the connection interface using EAGLE
• Created embedded so6ware in C and developed a remote-control application in C#