Zlatko S.-Senior Consultant
Check rate
Experience
Senior Consultant
Kater Systems
- Collaborated on debugging and maintaining the existing codebase
- Created diagrams and visualizations of system architecture
- Contributed to reports and scientific documents
Senior Android Developer
Payala
- Maintained, extended, and adapted the existing prototype to Kotlin
- Cross-platform development using Kotlin Multiplatform and Jetpack libraries (Compose, Hilt)
- Reviewed code and ensured reliability through test automation with Kotlin Coroutines
- Collaborated with team members to create development strategies
- Set up continuous delivery pipeline and automated tests with GitHub Actions
- Documented the software architecture and protocol process
- Contributed to CLI tools for provisioning smart cards for testing and customer use
- Updated the applet codebase to enable secure cryptographic communication and compatibility with current JavaCard SDK versions
Achievements:
- Payala App: Architected and developed a new iteration of the product based on modern app architecture and MVVM
- payala-sdk: Shared library for communication between devices and smart cards (NFC/BLE)
Software Developer
ilvi GmbH
- Co-developed the Xamarin app with a customizable user interface and features tailored to the different needs of healthcare institutions and their staff
- Designed and developed a standalone software library to interface the application with medical devices
- Developed, documented, and ensured quality as part of the ISO 13485 QMS
Achievements:
- qPC: Windows application for automating patient data entry in ECG devices to reduce potential errors in datasets
- BLE Library: AIDL library for Bluetooth communication using RxJava and RxAndroidBle
- AEDCOM: Prototype of a communication module for the Zoll AED3 that connects emergency services with the person providing aid
Freelance Mobile App Developer
Business School Benko
- Developed an app with Ionic Framework including Stripe payments as well as Google and Facebook OAuth
- Adapted the UI/UX design in collaboration with the design team to incorporate new features and final functionalities
- Collaborated with backend developers to plan app features and API endpoints
Achievements:
- Paukino App: Developed and launched the product on Google Play and the App Store
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Healthcare, Banking and Finance, and Education.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Quality Assurance, and Research and Development.
Summary
Android developer with over 8 years of experience in areas where security and reliability are top priorities. Highly skilled in Kotlin and Java, with extensive know-how in implementing low-level protocols and cross-platform development.
Skills
Core Competencies**
Kotlin Multiplatform
Jetpack Libraries (Compose, Hilt)
Kotlin Coroutines
Room
Automated Testing/Tdd
Retrofit
Modern App Architecture/Mvvm
Additional Areas Of Expertise**
Nfc - Iso 14443
Bluetooth Le
Android Java
C#/.Net
Javacard Api
Threat Modeling
Reverse Engineering
Secure Mobile App Development
Tool Proficiency**
Git/Github/Bitbucket
Bamboo/Github Actions
Confluence/Notion/Github Wiki
Android Studio/Visual Studio
Gradle/Maven
Postman
Figma
Globalplatformpro
Languages
Education
Technical University of Graz
Bachelor Programme · Software Engineering and Business · Graz, Austria
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Zlatko is based in Graz, Austria.
Zlatko speaks the following languages: Bosnian (Native), German (Advanced), English (Advanced).
Zlatko has at least 9 years of experience. During this time, Zlatko has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 2 years and 3 months. Note that Zlatko may not have shared all experience and actually has more experience.
Based on recent experience, Zlatko would be well-suited for roles such as: Senior Consultant, Senior Android Developer, Software Developer.
Zlatko's most recent position is Senior Consultant at Kater Systems.
In recent years, Zlatko has worked for Kater Systems, Payala, and ilvi GmbH.
Zlatko is most experienced in industries like Information Technology, Healthcare, and Banking and Finance. Zlatko also has some experience in Education.
Zlatko is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Zlatko also has some experience in Research and Development.
Zlatko has recently worked in industries like Information Technology, Healthcare, and Banking and Finance.
Zlatko has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Zlatko holds a Bachelor in Software Engineering and Business from Technical University of Graz.
The availability of Zlatko needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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