Zlatko S.-Senior Consultant
Check rate
Experience
Senior Consultant
Kater Systems
- Contributed to, debugged, and maintained the existing codebase
- Created diagrams and visualizations of the system architecture
- Contributed to reports and scientific texts
Senior Android Developer
Payala
- Contributed to, maintained, and expanded the existing prototype, adapting it in Kotlin
- Cross-platform development with Kotlin Multiplatform and Jetpack libraries (Compose, Hilt)
- Reviewed code and ensured reliability through automated testing with Kotlin Coroutines
- Collaborated with team members to develop strategies
- Set up a Continuous Delivery pipeline and automated tests with GitHub Actions
- Documented the software architecture and protocol process
- Contributed to CLI tools for deploying 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: Designed the architecture and developed a new iteration of the product based on modern application 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 configurable user interface and features tailored to the different needs of healthcare facilities and their staff
- Designed and developed a standalone software library that enables communication between the application and medical devices
- Development, documentation, and quality assurance under the ISO 13485 QMS
Achievements:
- qPC: Windows application for automating patient data entry into ECG devices to reduce potential errors in records
- BLE library: AIDL library for Bluetooth communication with RxJava and RxAndroidBle
- AEDCOM: Prototype communication module for the Zoll AED3, connecting emergency services with the person providing assistance
Freelance Mobile App Developer
Business School Benko
- Developed an app with Ionic Framework, including Stripe payments and Google and Facebook OAuth
- Adapted the UI/UX design in collaboration with the design team to incorporate new features and final functionality
- Collaborated with backend developers to plan application 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 expertise in implementing low-level protocols and cross-platform development.
Skills
Core Skills**
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 Moddeling
Reverse Engineering
Secure Mobile App Development
Tools**
Git/Github/Bitbucket
Bamboo/Github Actions
Confluence/Notion/Github Wiki
Android Studio/Visual Studio
Gradle/Maven
Postman
Figma
Globalplatformpro
Languages
Education
Technische Universität Graz
Bachelor Programme · Software Development and Business · Graz, Austria
Statistics
Experience
Global experience
Expertise
Qualifications
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 Development and Business from Technische Universität Graz.
Zlatko is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
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 11 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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