Ilker (Dipl.-Ing.) Baltaci
Freelance Mobile Developer
Experience
Freelance Mobile Developer
B+S Banksysteme AG
Developed the SecureMessaging Android and iOS app (authorization medium) to approve transactions in M.M.Warburg Bank's online banking.
Developed a performance-optimized stock trading app for iOS and Android.
Designed architecture for scalable white-label applications in the iOS and Android environment for banks and financial institutions.
Refactored outdated libraries and modernized the codebase of existing apps.
Migrated from XML to Jetpack Compose (Android) and from Xib/Storyboards to SwiftUI (iOS).
Advised on security issues and implemented CI pipelines to optimize workflows.
Founder / CEO
Lieba Soft & IT Consulting GmbH
Personally led and developed mobile apps and web projects from concept to launch.
Advised clients in IT with a focus on digital strategies and optimizations.
Responsible for all business areas, including business development and client relations.
Freelance Software Engineer (Part-time)
Cirrantic GmbH
Developed the Moovility and EVN apps for charging electric cars on iOS and Android, including CarPlay and Android Auto integration.
Designed system architecture for payment modules and end-to-end testing.
Optimized the payment API for mobile applications with a focus on security.
Freelance Full Stack / App Developer (Part-time)
Greenfinder Services GmbH
Developed a B2B iOS app for e-bike dealers and trade shows in the mobility sector to support inventory management, event registration, and product testing for items like e-bikes and climbing gear.
Implemented CRM and inventory management system to streamline dealer operations.
Digitized the process for managing event and test ride registrations, product reservations, and time tracking to ensure smooth event execution.
Built registration websites for major cycling events, including Eurobike and E-Bike Days, integrated with the iOS app.
Created survey management features and designed and implemented public APIs for clients using Node.js.
Integrated external services like Smartsheet and SurveyJS with custom webhooks.
Advised on digital transformation and process optimization to improve operational efficiency.
Provided DevOps and maintenance support for cloud services on Google Cloud and Firebase to ensure reliable performance and scalability.
Freelance Mobile Developer
Liebherr Hausgeräte GmbH
Developed various iOS apps (e.g., HNGRY, Components, Smart Device 2.0).
Introduced modern app architectures using SwiftUI, Combine, and async/await.
Mentored and trained junior developers and conducted tech talks.
Freelance iOS Engineer (Part-Time)
DAK Gesundheit
Developed the DAK iOS app with a focus on the rewards section.
Refactored code from RxSwift to Combine for improved performance.
Freelance Full Stack / App Developer (Part-Time)
Petrik & Sahin OG
Designed and built a custom Order Management System (OMS) from scratch, including REST API, iOS and Android apps, and a web-based admin tool.
Implemented a tailored OMS to streamline order processing and inventory management across multiple platforms.
Helped the client digitize their order flow, moving from email-based processes to a more efficient, integrated system.
Developed and integrated the apps and admin tool with the OMS API for seamless operation.
Advised the client on security, digital transformation, and process optimization to boost sales and distribution efficiency.
Lead App Developer
ryd GmbH
Led the development of the ryd mobile apps and coordinated between different teams.
Rewrote the iOS app from Objective-C to Swift using an MVVM architecture and added new features for iOS and Android apps.
Rebuilt the Android app from Java to Kotlin with Compose, using modern architectures for better maintainability and scalability.
Developed a Kotlin Multiplatform framework for the payments module to streamline cross-platform development.
Built and managed the mobile app team, handling project and team management.
Created API documentation, coding guidelines, and set up CI pipeline automation.
Mentored and coached app developers and ran onboarding and training sessions.
Senior Software Engineer
Media-Saturn-Holding GmbH
Served as Lead App Developer and architect for the internal S5 ticket system.
Developed REST APIs with PHP Symfony 3 and implemented features for iOS and Android apps.
Took on the role of interim Scrum Master to support agile processes and team coordination.
Built an iOS app prototyping kit to speed up app development.
Mentored the winning team in the MS Business Hackathon 2017 and supported other app developers.
Trained and guided junior developers.
Senior Software Engineer
Check24 GmbH
Led the iOS team and designed the native iOS apps in the finance/credit division.
Transformed 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 in Java SE to increase development efficiency.
Mentored and onboarded junior developers and held internal tech talks to share knowledge and best practices.
Senior iOS Developer
Sixt GmbH
- Manage project and release cycles for the DriveNow iOS app.
- Maintain and enhance the DriveNow Windows Phone app.
- Implement the DriveNow Apple Watch app.
- Project and release management for the myDriver iOS app.
- Design RESTful APIs and manage CI/CD pipelines with Jenkins.
- Collaborate and support external developers for seamless integration and consistency.
- Develop and maintain various iOS apps, including iSixt, Sixt Mobility for BMW, and Sixt Leasing.
- Develop iBeacon projects (iOS MVPs) and an indoor navigation app for airport parking garages.
- Implement location-based advertising features for the iSixt app.
Junior Mobile Application Engineer
Phantom Softwareentwicklung GmbH
- Develop ALDI TALK and AY YILDIZ apps for iOS and Android.
- Conduct feasibility analysis for mobile app projects for E-Plus.
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (6.5 years), Insurance (5.5 years), Automotive (3.5 years), Banking and Finance (3 years), Manufacturing (3 years), and Retail (1.5 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (13 years), Product Development (12 years), Project Management (8 years), Quality Assurance (1 year), Supply Chain Management (1 year), and Research and Development (0.5 years).
Summary
Freelance software developer with 15 years of experience in iOS and Android development, API design, IT consulting, and digital transformation. My portfolio focuses on finance, mobility, and IoT.
Languages
Education
ETSI Sevilla, KTH Stockholm, TU Wien
T.I.M.E European Management Program · Stockholm, Sweden
Vienna University of Technology
Dipl.-Ing. Business Informatics · Business Informatics · Vienna, Austria
Vienna University of Technology
B.Sc. Technical Computer Science · Technical Computer Science · Vienna, Austria
Profile
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