(Senior) Software Architect Consultant

Collaborated on the development of a WebApp for a prominent banking group, including Volksbank and Raiffeisenbanken. The project focused on creating a comprehensive dashboard that provided real-time access to critical financial data and market insights, while ensuring high security standards were met throughout the development process.
Key contributions included:

• Dashboard Design and Implementation: Designed and implemented a dynamic dashboard interface using React.js, tailored to display complex financial data in an intuitive and user-friendly manner. The dashboard allowed users to easily navigate through key performance indicators (KPIs), financial metrics, and trend analyses.
• Responsive Web Design: Developed a fully responsive web application that ensured seamless user experiences across both desktop and mobile devices. This included optimizing the layout, navigation, and interactive elements to be fully functional and aesthetically pleasing on various screen sizes.
• Customer Consultation Features: Integrated customer consultation tools within the WebApp, enabling bank representatives to interact with clients directly through the platform. These tools supported personalized financial advice and data-driven decision-making.
• "Downloads Shopping Cart" Functionality: Engineered a "downloads shopping cart" feature, allowing users to select and compile multiple financial reports, documents, and data sets for bulk download. This feature was particularly useful for professionals needing to gather extensive information quickly and efficiently.
• Security and Compliance: Implemented robust security measures to ensure the protection of sensitive financial data. This included data encryption, secure authentication protocols, and adherence to industry-specific regulatory requirements such as GDPR (General Data Protection Regulation). Additionally, the application was designed to prevent common security threats such as SQL injection, cross-site scripting (XSS), and cross-site request forgery (CSRF), ensuring that all user interactions were secure and compliant with banking standards.
• Performance Optimization: Applied various optimization techniques to ensure the WebApp performed efficiently under high data loads, delivering a fast and reliable user experience.
• Security Audits and Testing: Conducted thorough security audits and penetration testing throughout the development cycle to identify and mitigate potential vulnerabilities. These proactive measures ensured that the WebApp not only met but exceeded the stringent security expectations of the banking sector.

This project resulted in a powerful, secure, and user-centric WebApp that significantly enhanced the ability of bank representatives to access, analyze, and present financial data, while providing clients with a secure platform for financial consultation and decision-making.

Played a key role in the development of the YouSport Reporter app, a comprehensive mobile application built entirely with Flutter. The app was designed to meet the needs of sports enthusiasts and reporters, allowing them to record sports events, create highlight clips, and customize various settings to enhance the user experience.
Key contributions included:

• Flutter Development: Led the development of the app from the ground up using Flutter, ensuring cross-platform compatibility and a consistent user experience on both iOS and Android devices. The app leveraged Flutter's capabilities to deliver smooth performance and a modern, responsive UI.
• Advanced Media Features: Integrated advanced features for recording and editing sports events. The app utilized FFmpeg for background video processing, allowing users to cut and render clips efficiently while continuing to use the app. This feature was designed to work seamlessly over both cellular networks and Wi-Fi, with intelligent handling of uploads depending on the network availability.
• Custom Plugin Development: Overcame limitations of the official Flutter Camera Plugin by modifying it and developing custom plugins to meet the specific needs of the app. This included enhancements to support high-quality video recording and real-time processing, ensuring the app could handle demanding tasks with ease.
• Clean Architecture Implementation: Applied Clean Architecture principles to structure the app's codebase, ensuring maintainability, scalability, and ease of testing. This architectural approach allowed for a clear separation of concerns, making the app's complex features easier to manage and extend.
• User Experience Optimization: Focused on delivering a user-friendly interface with extensive customization options. This included intuitive controls for video recording, easy-to-navigate menus, and settings that allowed users to tailor the app's behavior to their specific needs, ultimately enhancing the overall user experience.

This project demonstrated my ability to develop high-performance, media-focused mobile applications using Flutter, while addressing complex technical challenges and ensuring a top-tier user experience.

Development of a white label app solution that can be used for tourist attractions worldwide. This project involved the complete development in Flutter, ensuring offline capability, and the creation of self-developed modules for geofencing, leaflet map integration, dark mode, video and audio playback, and a modern clean app UI for both iOS and Android platforms.
In addition to the mobile development, I was responsible for the design and implementation of the backend infrastructure using Python and Django. The backend was developed to handle scalable data management, including the storage and retrieval of large media files, user authentication, and real-time data synchronization across multiple devices. The Django REST Framework was utilized to build robust, secure, and high-performance APIs that facilitated seamless communication between the mobile app and the server.
Key backend features included:

• Scalable Data Management: Designed a database architecture using PostgreSQL, optimized for handling large datasets related to tourist information, including media files, user-generated content, and geolocation data.
• User Authentication and Security: Implemented secure user authentication mechanisms with Django, ensuring that sensitive user data and interactions were protected.
• Real-time Synchronization: Integrated real-time data synchronization using Django Channels and WebSockets to keep app data up-to-date across all user devices.
• Media Handling and Storage: Developed efficient methods for storing, retrieving, and streaming video and audio content, ensuring smooth playback even in low-bandwidth conditions.
• API Development: Created RESTful APIs with Django REST Framework to support the mobile app's features, including user interactions, content management, and data updates.
• Server Deployment and CI/CD: Deployed the backend on a cloud infrastructure with automated CI/CD pipelines to ensure continuous integration, testing, and deployment of updates.

The integration of these backend solutions ensured a seamless and robust experience for users, enhancing the app’s capability to deliver content reliably across various locations worldwide.

Contributed to the iOS development team at IBM for a large-scale healthcare project, focusing on delivering high-quality code and implementing robust design patterns. The project aimed to serve over 20 million potential end users, demanding exceptional attention to detail in both architecture and user experience.
Key contributions included:

• Swift and UIKit Development: Worked extensively with Swift and UIKit to develop and maintain key features of the healthcare app. The focus was on creating a responsive and user-friendly interface that adhered to the high standards required for healthcare applications.
• MVVM and VIPER Architecture: Applied and reinforced MVVM (Model-View-ViewModel) and VIPER (View-Interactor-Presenter-Entity-Router) design patterns to ensure that the app's architecture was modular, scalable, and maintainable. These patterns were essential in managing the complexity of the app and supporting the clean separation of concerns, making the codebase easier to test and extend.
• Test-Driven Development (TDD): Contributed to a development process that prioritized Test-Driven Development (TDD), ensuring that all new features were thoroughly tested and met the stringent quality standards required for healthcare applications. This approach helped maintain high code quality and reliability.
• Ticket Resolution: Towards the latter part of the project, focused on resolving technical debt by addressing and resolving a backlog of tickets. This included bug fixes, performance enhancements, and UI refinements, all aimed at improving the overall stability and user experience of the app.
• High Code Quality Standards: Ensured that all code met the high-quality standards necessary for an app with such a significant user base. This included rigorous code reviews, adherence to best practices, and a strong focus on clean, maintainable code.

This project allowed me to deepen my expertise in iOS development, particularly in the areas of architectural design with MVVM and VIPER, and maintaining high-quality standards in a complex, large-scale application.

Workshop – Mobile Development:
Conducted a two-day intensive workshop focused on mobile development, providing in-depth consultation on the realization and optimization of mobile applications. The workshop included hands-on sessions with rudimentary example projects, enabling participants to gain a solid understanding of fundamental iOS development concepts. Key topics covered during the workshop included cost comparison, development efforts, and strategies for ongoing maintenance post-deployment. Additionally, the training provided insights into best practices for optimizing development processes and maintaining high-quality standards in mobile app projects, equipping participants with the knowledge to build efficient and maintainable applications.
Mobile Developer – React Native and Firmware Development:
Following the workshop, I provided critical support in the development of a React Native application designed to control hospital beds via native Bluetooth modules, alongside developing the necessary firmware for microcontroller-based bed control systems. This project, developed for internal use by hospital staff and sales teams, required precise integration between React Native, native Bluetooth functionalities, and low-level firmware.

• React Native Development: Led the realization of the app using React Native, ensuring seamless cross-platform compatibility and reliable performance on both iOS and Android devices. The app's core functionality involved controlling hospital beds through a native Bluetooth connection, allowing for intuitive and responsive adjustments.
• Integration with Native Modules: Overcame technical challenges by integrating React Native with native Bluetooth modules, enabling real-time control of hospital beds. This integration was crucial for delivering a smooth and responsive user experience tailored to the specific needs of healthcare professionals.
• Firmware Development for Microcontrollers: Developed the firmware in C for the microcontrollers responsible for controlling the hospital beds. This involved programming low-level hardware interfaces to ensure precise and reliable operation of bed adjustments, including motor control and sensor data processing.
• State Management with MobX: Implemented MobX for efficient state management, ensuring that the app's user interface remained responsive and accurately reflected real-time changes in the state. This enhanced the usability and reliability of the application in critical healthcare settings.
• Type Safety with Flow: Utilized Flow for static type checking, improving code reliability by catching potential errors early in the development process. This focus on type safety was essential for ensuring the robustness of the application in a healthcare environment.
• Deployment Process: Managed the deployment process, including setting up automated deployment pipelines and conducting thorough testing to ensure that the app and firmware were delivered with high reliability and performance. The solutions were successfully integrated into the hospital's existing systems, enhancing operational efficiency.

This project showcased my ability to deliver specialized mobile solutions and embedded firmware, addressing the unique challenges of healthcare technology and IoT integration.

Led the complete overhaul of the Gelbe Seiten iOS app, transitioning the project from Objective-C to Swift under significant time constraints. This involved not only rewriting the entire codebase but also implementing a modern design and integrating new APIs to enhance the app's functionality and user experience.
Key contributions included:

• Swift Migration: Successfully migrated the entire codebase from Objective-C to Swift, significantly improving the app's performance, maintainability, and scalability. This migration was crucial in modernizing the app and aligning it with current iOS development standards.
• UI/UX Redesign: Developed and implemented a new design concept using UIKit, providing a refreshed, intuitive user interface that improved user engagement and satisfaction. The redesign was carefully crafted to maintain brand consistency while enhancing usability.
• API Integration: Integrated new APIs to expand the app's features and improve data handling, ensuring that the app remained competitive and met user expectations. This included seamless integration with backend services to provide real-time updates and enhanced data synchronization.
• Test Coverage and QA: Established comprehensive test environments and significantly increased test coverage to ensure the app's reliability and stability. This included unit tests, integration tests, and user acceptance testing (UAT), all of which were crucial for maintaining high-quality standards under tight deadlines.
• Time-Sensitive Delivery: Managed the project under considerable time pressure, successfully delivering version 6.2 of the app by the end of October 2017. This release included all the new features, design improvements, and performance enhancements, demonstrating the ability to deliver high-quality work within stringent timelines.

The app, released as version 6.2, received positive feedback for its improved performance, modern design, and enhanced functionality, solidifying its position as a leading tool in the digital yellow pages space.

Provided comprehensive consultation and fullstack development services for the "Tutti Taxi" app, a project undertaken for the Swiss company Web-Davimax GmbH. My role encompassed the complete design and development of the mobile applications, as well as the backend and administration dashboard, ensuring a seamless and integrated user experience across all platforms.
Key contributions included:

• Fullstack Development: Led the development of both the iOS and Android applications, working natively on each platform to ensure optimal performance and user experience. This involved designing and implementing a cohesive UI/UX that was consistent across both operating systems, leveraging native development environments such as Xcode for iOS and Android Studio for Android.
• Backend Development: Designed and built a robust backend using Node.js and Express, with a MongoDB database for efficient data management. The backend was developed to handle real-time data processing, user authentication, and interactions between the mobile apps and the server, ensuring a responsive and reliable service.
• Admin Dashboard Development: Created an administration dashboard using React.js, providing the client with a powerful tool to manage the app's operations, monitor user activity, and control content. The dashboard was designed with a focus on usability, allowing administrators to easily navigate and manage the backend system.
• UI/UX Design: Crafted the complete UI/UX design for the "Tutti Taxi" app, ensuring a user-friendly and visually appealing interface. The design was developed to be intuitive, enhancing the overall user experience and encouraging adoption among users.
• Cross-Platform Consistency: Ensured that the app provided a consistent experience across both iOS and Android platforms, taking into account the unique characteristics and user expectations of each operating system.
• End-to-End Delivery: Managed the entire development lifecycle, from initial concept and design through to development, testing, and final delivery. The app was prepared for release by the customer, with a projected launch in November 2017.

This project showcased my ability to deliver a fully integrated, high-quality mobile and backend solution, tailored to meet the specific needs of the client while ensuring a smooth and engaging user experience across all platforms.

Developed a comprehensive mobile application for trade fair visitors at the Messe Bad Salzuflen, focusing on enhancing the attendee experience through advanced location-based services and intuitive navigation tools. This app was developed natively for both iOS and Android platforms, ensuring optimal performance and a seamless user experience.
Key contributions included:

• Real-Time Location Tracking: Implemented real-time location tracking within the app, enabling users to accurately navigate the exhibition halls. This feature allowed visitors to find their current position on a map, locate exhibitors, and receive turn-by-turn directions to booths or event locations, significantly improving the overall trade fair experience.
• Augmented Reality (AR) Mode: Integrated an AR mode that provided an interactive and immersive way for users to navigate the trade fair. By leveraging the device's camera and sensors, users could see virtual markers overlaid on the real-world environment, guiding them to points of interest within the trade fair.
• Native Development for iOS and Android: The app was developed natively for both iOS and Android platforms using Xcode and Android Studio. This approach ensured that the app could fully utilize the native capabilities of each operating system, providing a responsive and reliable user experience.
• Exhibitor Search and Event Management: Developed features that allowed users to search for exhibitors, save events to their personal schedule, and receive notifications about upcoming sessions or changes. This functionality was designed to help visitors efficiently plan and manage their time at the trade fair.
• User-Centric Design: Focused on creating an intuitive and user-friendly interface that catered to the needs of trade fair visitors. The design emphasized ease of use, enabling even first-time users to navigate the app and access its features with minimal effort.
• Deployment and Support: Managed the deployment of the app to both the App Store and Google Play, ensuring it was easily accessible to all visitors. Although the app is no longer officially supported for economic reasons, it was well-received during its active period and significantly enhanced the visitor experience at the Messe Bad Salzuflen.

As a Lead Mobile Developer at TREU Digital, a prominent advertising agency, I played a pivotal role in enhancing the quality and performance of mobile applications through rigorous code reviews, optimization, and strategic planning. My responsibilities extended beyond mobile development, encompassing the design and implementation of Python-based web applications, data analysis, and data engineering projects.
Key contributions included:

• Lead Mobile Development: Led a team of three developers in the creation and optimization of mobile applications. This involved defining the app concepts, identifying target audiences, and designing the corresponding UI/UX to ensure that the final products were both user-friendly and aligned with the clients' marketing goals. Technologies used included Swift for iOS development, Java for Android development, and React Native for cross-platform solutions.
• Python Web Applications: Developed and maintained several Python-based web applications that supported the agency's digital marketing efforts. These applications were built using Django and Flask frameworks, with PostgreSQL and MongoDB databases to handle various backend processes. The web applications played a crucial role in content management, campaign tracking, and automation within the agency.
• Data Analysis and User Data Evaluation: Conducted in-depth analysis of user data to derive actionable insights that informed app design, marketing strategies, and feature development. Utilized Python libraries such as Pandas, NumPy, and SciPy to analyze large datasets. Visualization tools like Matplotlib and Seaborn were employed to present data in an accessible format for stakeholders, driving informed decisions that enhanced user engagement and campaign effectiveness.
• A/B Testing and Optimization: Implemented A/B testing frameworks using Google Optimize and custom-built solutions with Python to evaluate different app features and user interface designs. These tests were crucial in determining the most effective designs and functionalities, leading to higher conversion rates and improved user satisfaction.
• Data Engineering: Built and managed data pipelines that collected, processed, and stored user interaction data from mobile and web applications. Leveraged technologies like AWS S3 for scalable storage solutions and Redshift for data warehousing. These pipelines ensured that data was processed efficiently and made available for real-time analysis and reporting.
• Mobile Application Development: Beyond leadership, I was hands-on in the development of mobile applications, focusing on performance optimization, user experience, and integrating data-driven features that enhanced app functionality. Tools and technologies used included Xcode for iOS development, Android Studio for Android development, and Firebase for real-time data synchronization and push notifications.
• Quality Assurance: Established and enforced high standards of code quality through regular code reviews using platforms like GitHub and Bitbucket. Continuous Integration/Continuous Deployment (CI/CD) pipelines were set up using Jenkins and Travis CI to automate testing and deployment processes, ensuring that all deliverables met the agency’s quality benchmarks and were delivered on time.

This role allowed me to blend my expertise in mobile development with my skills in Python-based web applications, data analysis, and engineering, contributing to the success of multiple digital marketing campaigns and the development of high-quality mobile applications. The technologies I utilized were instrumental in driving the innovation and efficiency of the solutions we delivered.