Available to hire
Hi, I’m Ilker Baltaci, a senior mobile and full-stack engineer with 15+ years of experience delivering native iOS and Android apps, cloud architectures, and secure fintech solutions. I enjoy leading complex projects from concept to go-live, mentoring teams, and designing scalable architectures across mobile, web, and backend systems. My work blends strong engineering, product thinking, and security by design to create reliable and performant software.
Currently I’m building Lieba Soft & IT Consulting GmbH in Munich as founder/CEO, and I’m actively advancing a stealth-mode AI video platform with serverless AWS architecture. I’m energized by turning ideas into tangible products, collaborating closely with product, design, and business stakeholders, and delivering robust, cost-efficient solutions for financial services and large-scale consumer apps.
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Language
German
Fluent
Turkish
Fluent
English
Fluent
Italian
Intermediate
Work Experience
Founder / CEO at Lieba So 6 & IT ConsulJng GmbH
July 1, 2024 - PresentLead founder and CEO responsible for concept-to-release delivery of mobile app projects, client IT consulting, and company operations including business development and client relations.
Freelance Mobile Engineer at B+S Banksysteme AG
October 1, 2024 - PresentRewrote secure messaging apps from Xamarin to native codebase; built cryptographic components library (CryptoKit, LibSodium) for transaction signing; developed stock trading app (PlanSpiel); designed scalable white-label app architecture; improved code stability and modern compatibility; implemented CI pipelines.
Freelance Mobile Developer at Liebherr Hausgeräte GmbH
April 1, 2024 - September 19, 2025Developed multiple iOS apps (HNGRY, Components, Smart Device 2.0); designed modern app architecture with SwiftUI, Combine, async/await; mentored junior developers; collaborated cross-functionally; designed and managed mobile APIs.
Freelance Software Engineer (Part-time) at Cirran Jc GmbH
July 1, 2024 - September 19, 2025Developed Moovility and EVN apps for iOS and Android (CarPlay/Android Auto); designed APIs, managed releases, performed end-to-end testing; orchestrated overall payment system architecture; provided IT security consulting.
Freelance iOS Developer (Part-time) at DAK Gesundheit
March 1, 2022 - September 19, 2025Developed iOS app focusing on Bonus section; refactored code from RxSwift to Combine for performance; evaluated UX feasibility to ensure optimal user experience.
Freelance Full Stack / App Developer (Part-time) at Green Finder Services GmbH
July 1, 2024 - September 19, 2025Built B2B iOS app for e-bike dealers and mobility fairs; implemented CRM and inventory management; digitalized event registrations, product reservations, and ride-time tracking; developed guest registration websites for major events; created surveys and public APIs.
Lead App Developer at ryd GmbH
July 1, 2021 - September 19, 2025Led development for ryd mobile apps; rewrote iOS app to SwiftUI with MVVM; migrated Android app to Kotlin with Compose; built a Kotlin multi-platform framework for payment module; recruited and mentored mobile team; defined API documentation and CI; implemented cross-team training.
Freelance Full Stack / App Developer (Part-time) at Petrik & Sahin OG
November 1, 2017 - September 19, 2025Designed and developed a custom Order Management System (OMS) including REST API, iOS and Android apps, and a web admin tool; integrated OMS with apps to streamline cross-platform operations; advised on security, digital transformation, and process optimization.
Senior Software Engineer at Media-Saturn-Holding GmbH
October 1, 2017 - September 19, 2025Lead developer/architect for S5 internal ticketing system; built REST APIs with PHP Symfony; acted as interim Scrum Master; created iOS app prototyping kit; mentored junior developers and supported internal teams.
Senior Software Engineer / iOS Team Lead at Check24 GmbH
April 1, 2017 - September 19, 2025iOS team lead and architect for consumer loan division; migrated web app to native iOS; designed APIs for responsive websites and apps; developed code generator for XSD to Swift; mentored juniors and led tech talks.
Senior iOS Developer at Sixt GmbH
September 1, 2015 - September 19, 2025Lead mobile developer for DriveNow (2015) and MyDriver (2014); managed project/releases for iOS; built Apple Watch app; supported external developers; implemented iBeacon projects and indoor navigation.
iOS Developer at Toolani GmbH
July 1, 2013 - September 19, 2025Developed multiple VoIP and messaging apps for iOS; focused on UX improvements and core functionality.
Junior Mobile Application Engineer at Phantom Softwareentwicklung GmbH
December 1, 2011 - September 19, 2025Contributed to iOS/Android app development for ALDI TALK and AY YILDIZ; feasibility analyses for mobile projects.
Trainee at Döktas A.S
September 1, 2009 - September 19, 2025Inventory management software development for electronics components (MS Office-based).
Trainee at Tomas Bata University
November 1, 2009 - September 19, 2025Developed PC-controlled washing machine model; PCB design; embedded software in C and remote-control app in C#.
Founder / CEO at Lieba So 6 & IT Consul Jng GmbH
July 1, 2024 - PresentFounder and CEO responsible for conceiving, evaluating, and delivering mobile app projects from concept to release. Provides IT consulting services focused on digital strategy and operational optimization. Oversees company operations, business development, and client relations.
Freelance Mobile Engineer at B+S Banksysteme AG
October 1, 2024 - PresentRewrote secure messaging apps for iOS and Android from Xamarin to native code. Designed and deployed cryptographic components library using CryptoKit and LibSodium for transaction signing, ensuring data integrity and full compliance with banking security standards. Developed a stock trading app (PlanSpiel) for iOS and Android with optimized performance and user experience. Designed a scalable white-label use case app architecture for banks and financial institutions. Refactored deprecated libraries and code base, enhancing stability and compatibility. Replaced XML files in Android with Jetpack Compose; Replaced Xib/Storyboards with SwiftUI; Consulted on security to safeguard against vulnerabilities. Implemented CI pipelines to streamline workflows and accelerate deployments.
Freelance Mobile Developer at Liebherr Hausgeräte GmbH
April 1, 2024 - September 19, 2025Developed various iOS apps, including HNGRY, Components, and Smart Device 2.0. Designed a modern app use case architecture with SwiftUI, Combine, and async / await. Mentored junior developers and led cross-team training sessions and tech talks. Collaborated cross-functionally with other teams (Cloud, Backend and Android). Designed and managed mobile APIs.
Freelance Software Engineer (Part-time) at Cirran JC GmbH
July 1, 2024 - September 19, 2025Developed Moovility and EVN apps for iOS and Android, including CarPlay and Android Auto integration. Designed APIs, managed releases, and conducted end-to-end testing. Orchestrated the implementation of overall payment system architecture and provided IT security consulting to enhance app and infrastructure security.
Freelance iOS Developer (Part-time) at DAK Gesundheit
March 1, 2022 - September 19, 2025Developed 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.
Freelance Full Stack / App Developer (Part-time) at Greenfinder Services GmbH
July 1, 2024 - September 19, 2025Developed a B2B iOS app for e-bike dealers and mobility fairs, supporting inventory management, event registration, and product testing. Implemented CRM and inventory management systems to optimize dealer operations. Digitalized event and test ride registrations, product reservations, and ride time tracking for seamless event execution. Created guest registration websites for Eurobike and E-Bike Days, and integrated them with the iOS app. Implemented survey management features and public APIs using Node.js. Integrated Smartsheet and SurveyJS via custom webhooks. Provided consulting in digital transformation and process optimization; offered DevOps and maintenance support for cloud services on Google Cloud and Firebase.
Lead App Developer at ryd GmbH
July 1, 2021 - September 19, 2025Led development for ryd mobile apps and managed cross-team coordination. Rewrote the iOS app from Objective-C to Swift with MVVM; implemented new features for iOS and Android apps. Rebuilt the Android app from Java to Kotlin with Jetpack Compose, adopting a modern architecture for maintainability and scalability. Built a Kotlin Multiplatform framework for the payment module to streamline cross-platform development. Recruited and led the mobile app team; defined API documentation, coding guidelines, and set up CI automation. Mentored and trained app developers and facilitated onboarding.
Freelance Full Stack / App Developer (Part-time) at Petrik & Sahin OG
November 1, 2017 - September 19, 2025Designed and developed a custom Order Management System (OMS) including REST API, iOS and Android applications, and a web-based admin tool from scratch. Implemented OMS to streamline order processing and inventory management across multiple platforms. Supported the client in digitalizing their order flow, transitioning from email-based processes to an integrated system. Built and integrated apps and the web admin tool with the OMS API to ensure seamless operation. Provided consulting on security, digital transformation, and process optimization to improve operational efficiency.
Senior Software Engineer at Media-Saturn-Holding GmbH
October 1, 2017 - September 19, 2025Served 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.
Senior Software Engineer at Check24 GmbH
April 1, 2017 - September 19, 2025Served as iOS Team Lead and Architect for the consumer loan credit division, overseeing the development of native iOS apps 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 to enhance development efficiency. Mentored and onboarded junior developers and conducted internal tech talks.
Senior iOS Developer at Sixt GmbH
September 1, 2015 - September 19, 2025Lead Mobile Developer (DriveNow, 2015): Managed project and release cycles for the DriveNow iOS app. Led maintenance and enhancement of the DriveNow Windows Phone app and implemented the DriveNow Apple Watch app. Lead iOS Developer (myDriver, 2014): Oversaw project and release management for the myDriver iOS app, designed RESTful APIs, and managed CI/CD pipelines with Jenkins. Collaborated with external developers for seamless integration and development consistency. iOS Developer (2013): Built and maintained multiple iOS apps (iSixt, Sixt Mobility for BMW, Sixt Leasing); led iBeacon MVPs and an indoor navigation app for airport parking; implemented location-based advertising features for the iSixt app.
iOS Developer at Toolani GmbH
July 1, 2013 - September 19, 2025Developed and designed multiple VoIP and messaging apps for iOS (forfone and toolani), focusing on creating user-friendly interfaces and enhancing app functionality.
Junior Mobile Application Engineer at Phantom Softwareentwicklung GmbH
December 1, 2011 - September 19, 2025Contributed to the development of ALDI TALK and AY YILDIZ apps for iOS and Android. Conducted feasibility analyses for mobile app projects to inform project execution decisions.
Founder & CEO at Lieba Soft & IT Consulting GmbH
July 1, 2024 - PresentFounded and lead a software company specializing in mobile and web application development from concept to release; advise clients on digital strategy, IT transformation, and product optimization; oversee all company operations including business development, project management, and client relations; design and implement end-to-end architectures across mobile, web, and backend systems using modern frameworks and cloud platforms.
Co-Founder & CTO (Startup in Stealth-Mode) at Startup in Stealth-Mode
January 1, 2025 - PresentConceptualized and developed an AI-powered video collage platform for events and personal occasions; own end-to-end backend, frontend, and infrastructure; define MVP and product roadmap; architect and implement a scalable video-processing pipeline; build serverless AWS solutions; lead investor presentations with architecture diagrams, cost models, and go-to-market strategy.
Freelance Mobile Developer at B+S Banksysteme AG
October 1, 2024 - PresentDeveloped SecureMessaging apps for Android and iOS to enable secure online banking transaction approvals; implemented Keychain / Keystore, Face ID / Touch ID, TLS pinning, and app hardening; built a high-performance trading app with integrated charting and portfolio visuals; designed and implemented scalable white-label applications for banks in compliance with regulatory standards; migrated from XML to modern UI architectures and established CI environments.
Freelance iOS Developer at Liebherr Hausgeräte GmbH
April 1, 2024 - October 13, 2025Enhanced multiple iOS applications (HNGRY, Components, Smart Device 2.0) with a focus on usability and performance; extended and integrated existing Java Enterprise API for new features; introduced modern architectures (SwiftUI, Combine, async/await) and Clean Architecture; implemented comprehensive testing strategies (XCTest, snapshot, UI tests) and CI pipelines; integrated Azure Active Directory / OAuth2; mentored junior developers.
Freelance Software Engineer at Cirrantic GmbH
July 1, 2024 - October 13, 2025Developed Moovility and EVN iOS/Android apps with CarPlay/Android Auto integration; designed a white-label architecture for module reuse across variants; secured payments with end-to-end encryption, TLS pinning, and token handling; built robust end-to-end tests for payment flows; managed release workflows and production stabilization.
Freelance iOS Developer at DAK Gesundheit
March 1, 2022 - October 13, 2025Enhanced the DAK iOS app, focusing on the bonus program module; migrated from RxSwift to Combine; promoted modular architecture and prepared codebase for SwiftUI adoption; integrated internal REST APIs; established CI/CD pipelines; contributed to architecture decisions in an Agile environment.
Freelancer Full Stack / Mobile Developer (Part time) at Green finder Services GmbH
July 1, 2024 - October 13, 2025Led engineering for digital mobility platforms; designed and built a B2B iOS app for e-bike dealers, manufacturers, and trade fairs; developed a web app for the Eurobike trade fair with participant registration, QR/ticketing, and real-time analytics; implemented a CRM and inventory system and led API design with security considerations; established CI/CD pipelines.
Lead App Developer at ryd GmbH
July 1, 2021 - October 13, 2025Led development of ryd mobile apps, migrating iOS from Objective-C to Swift with MVVM; rebuilt Android app from Java to Kotlin; designed IoT features for OBD2 connectivity and in-car payments via MQTT; created a Kotlin Multiplatform framework for the payment module; owned API design, security reviews, and performance optimization; introduced automated testing and established CI/CD; mentored mobile team.
Freelance Full Stack / Mobile Developer (Part time) at Petrik & Sahin OG
November 1, 2017 - October 13, 2025Designed and delivered a custom Order Management System (OMS) with native iOS/Android apps; built a REST API using PHP Slim and MySQL; developed a web admin tool (PHP Slim) for real-time synchronization; integrated mobile apps with a unified OMS API; digitized processes and improved UX workflows; authored architecture documentation and conducted stakeholder training.
Senior Software Engineer at Media-Saturn-Holding GmbH
October 1, 2017 - October 13, 2025Led development as the internal ticketing and support system S5; integrated Azure AD SSO; designed scalable REST APIs with Symfony; defined API structures and data models for enterprise integration; created an iOS App Prototyping Kit to standardize UI components; acted as Interim Scrum Master and mentored teams.
Senior Software Engineer at Check24 GmbH
April 1, 2017 - October 13, 2025Rebuilt the native Check24 Finance app and led the Check24 app initiative; implemented modular architecture with CocoaPods; developed REST APIs for web/mobile integration; created code-generation tools to automate model creation; mentored developers and promoted architecture best practices.
Manager Software Development / Lead iOS Engineer at Sixt GmbH
September 1, 2015 - October 13, 2025Led DriveNow and related projects; contributed to the DriveNow iOS app and Windows Phone app; released the first-generation Apple Watch app; drove feature development, release management, and cross-team coordination in an agile environment.
Freelance iOS Developer at Toolani GmbH
July 1, 2013 - October 13, 2025Developed VoIP and messaging apps for iOS; implemented SIP-based communication, background handling, and real-time audio transmission; collaborated with backend teams on API design; crafted engaging UI animations and Core Data persistence; contributed to UI/UX improvements.
Mobile Engineer at Phantom Softwareentwicklung GmbH
December 1, 2011 - October 13, 2025Developed mobile apps for ALDI TALK and AY YILDIZ; conducted feasibility studies and prototyping; built a parking ticket extension app for Vienna and an astrology iOS app; supported cross-platform development efforts.
Founder / CEO at Lieba Soft & IT Consulting GmbH
July 1, 2024 - PresentFounded and lead a software company specialized in mobile and web application development from concept to release; advise clients on digital strategy and IT transformation; design end-to-end architectures across mobile, web, and backend systems using modern frameworks and cloud platforms.
Co-Founder & CTO at Startup in Stealth-Mode
January 1, 2025 - PresentConceptualized and developed an AI-powered video collage platform; owned end-to-end backend, frontend, infrastructure, and DevOps; conducted feasibility and cost analyses; defined MVP and product roadmap; architected a scalable video-processing pipeline and serverless AWS solutions; led investor presentations with architecture diagrams and cost models.
Freelance Mobile Developer at B+S Banksysteme AG
October 1, 2024 - PresentDeveloped secure messaging apps for Android and iOS to enable secure online banking transaction approvals; implemented Keychain/Keystore, biometrics, TLS pinning, and app hardening; built high-performance trading app for iOS/Android; integrated charting libraries and scalable white-label banking apps; migrated to modern architectures and set up CI/CD pipelines.
Freelance iOS Developer at Liebherr Hausgeräte GmbH
April 30, 2024 - October 13, 2025Developed multiple iOS applications; extended Java Enterprise API; introduced SwiftUI, MVVM, Combine, and modern testing strategies; integrated Azure Active Directory/OAuth2 login; mentored juniors and led architecture decisions; implemented automated testing pipelines.
Freelance Software Engineer at Cirrantic GmbH
July 31, 2024 - October 13, 2025Developed Moovility and EVN apps for iOS/Android with CarPlay/Android Auto integration; designed a white-label architecture for shared modules; secured payment modules with end-to-end encryption and robust error handling; implemented end-to-end payment tests and release management.
Freelance iOS Developer at DAK Gesundheit
March 31, 2022 - October 13, 2025Enhanced the DAK iOS app with a focus on the bonus program; refactored from RxSwift to Combine; introduced modular architecture and prepared for SwiftUI adoption; integrated REST APIs; established CI/CD pipelines; security and QA collaboration.
Freelancer Full Stack / Mobile Developer at Greenfinder Services GmbH
July 31, 2024 - October 13, 2025Led engineering for digital mobility platforms; built B2B iOS app for dealers and event management; created a web app for Eurobike with registration, QR/ticketing, and analytics; implemented CRM and inventory systems; serverless backend on Google Cloud; OCR library and Smartsheet integration; CI/CD and product roadmap.
Lead App Developer at ryd GmbH
July 31, 2021 - October 13, 2025Led development of ryd mobile apps; migrated iOS from Objective-C to Swift with MVVM; migrated Android from Java to Kotlin; built IoT features with OBD2 connectivity and MQTT; created a Kotlin Multiplatform framework for payment module; API design and CI/CD; mentored team.
Freelance Full Stack / Mobile Developer at Petrik & Sahin OG
November 1, 2017 - October 13, 2025Designed and delivered a custom Order Management System; developed native iOS/Android apps; built REST API with PHP Slim and MySQL; web admin with Slim; unified OMS API; digitized processes and automated workflows.
Senior Software Engineer at Media-Saturn-Holding GmbH
October 31, 2017 - October 13, 2025Lead App Developer and architect for internal ticket system S5; integrated Azure AD SSO; designed scalable REST APIs with Symfony 3; created iOS prototyping kit; served as Interim Scrum Master and mentored teams.
Senior Software Engineer at Check24 GmbH
April 30, 2017 - October 13, 2025Rebuilt native Check24 Finance app; introduced modular architecture with CocoaPods; developed internal REST APIs; created XSD-to-Swift code generator; mentored developers and drove architecture decisions.
Manager Software Development / Lead iOS Engineer at Sixt GmbH
September 1, 2015 - October 13, 2025Led DriveNow and myDriver mobile projects; released Apple Watch app; migrated to modern architectures; contributed to iSixt and other mobility initiatives; provided architecture decisions and mentorship.
Freelance iOS Developer at Toolani GmbH
July 1, 2013 - October 13, 2025Developed VoIP/iOS apps (forfone, toolani); implemented SIP, real-time communication, push notifications, and back-end collaboration; contributed to UI and performance optimizations.
Freelance Mobile Engineer at Phantom Softwareentwicklung GmbH
December 1, 2011 - October 13, 2025Developed ALDI TALK and AY YILDIZ mobile apps; prototyping for telecom concepts; built parking ticket extension app; created iOS astrology app; early cross-platform concepts.
Education
High School Diploma at Saint Georg Austrian High School
October 1, 2000 - June 1, 2010BSc. in Computer Engineering at Vienna University of Technology
October 1, 2005 - March 1, 2010Dipl. Ing. in Business Informatics (Wirtschaftsinformatik) at Vienna University of Technology
March 1, 2010 - April 1, 2013Expert in Innovation Management and Business Planning at ETSI – University of Sevilla, KTH Stockholm, Vienna TU
September 1, 2010 - September 1, 2011Dipl. Ing. in Business Informatics (Wirtschaftsinformatik) at Vienna University of Technology
March 1, 2010 - April 1, 2013Expert in Innovation Management and Business Planning at T.I.M.E European Management Program
September 1, 2010 - September 1, 2011BSc in Computer Engineering at Vienna University of Technology
October 1, 2005 - March 1, 2010High School Diploma at Saint Georg Austrian High School, Istanbul
October 1, 2000 - June 1, 2010Dipl.-Ing. in Business Informatics at Vienna University of Technology (TU Wien)
March 1, 2010 - April 1, 2013T.I.M.E European Management Program at ETSI Sevilla, KTH Stockholm, TU Wien
September 1, 2010 - September 1, 2011B.Sc. in Computer Engineering at Vienna University of Technology (TU Wien)
October 1, 2005 - March 1, 2010Dipl.-Ing. in Business Informatics at Vienna University of Technology (TU Wien)
March 1, 2010 - April 1, 2013B.Sc. in Computer Engineering at Vienna University of Technology (TU Wien)
October 1, 2005 - March 1, 2010T.I.M.E. European Management Program at ETSI Sevilla, KTH Stockholm, TU Wien
September 1, 2010 - September 1, 2011Qualifications
Expert in Innovation Management and Business Planning
September 1, 2010 - September 1, 2011Expert in Innovation Management and Business Planning
September 1, 2010 - September 1, 2011Publication: Service Recommendation: Recommendation systems for services
January 1, 2015 - December 31, 2015Industry Experience
Software & Internet, Professional Services, Media & Entertainment, Telecommunications, Computers & Electronics, Financial Services, Transportation & Logistics
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