Aleksandar Tomislav Markovic, Software Developer in Belgrade, Serbia
Aleksandar Tomislav Markovic

Software Developer in Belgrade, Serbia

Member since January 26, 2016
Aleksandar has been a software developer for about 5 years now, doing everything from Assembler programming to web development and, more recently, Android development. He has done work for companies like Sony Mobile, Plantronics, and Bottle Rocket Studios, and his communication skills combined with solid development work make him a useful asset to any project.
Aleksandar is now available for hire




Belgrade, Serbia



Preferred Environment

Android, Git, Linux

The most amazing...

...thing I've done is use Bluetooth Low Energy devices for indoor navigation.


  • Senior Android Developer

    2019 - 2020
    • Worked on integrating Bluetooth iHealth devices for measuring blood pressure and glucose in the blood.
    • Implemented graphs for displaying blood pressure and glucose results to patients. Users can filter results by day, week, month, or year.
    • Worked closely with the designers to make the app intuitive and easy to use, so that users can easily check their next trial visit and their available payments.
    • Integrated an AWS Cognito service for user authentication. Integrated continuous integration using CircleCI and Fastlane for easy distribution of test and production releases, and also integrated Sentry service for error tracking.
    • Maintained and published the app on Google Play Store.
    Technologies: Kotlin, Android, Bluetooth
  • Senior Android Developer

    2018 - 2020
    • Maintained and implemented new functionalities into the existing CafeWell app.
    • Converted the app's code completely to support the newest AndroidX libraries and also converted the remaining parts of code written in Java to Kotlin.
    • Helped the team improve and stabilize back-end services written in Java, Ruby, and Node.js.
    Technologies: Android, Kotlin
  • Senior Android Developer

    2017 - 2019
    • Built Temptime's Android app using the new Camera 2 APIs to detect the changes in the color of a temperature sensor that is injected on a QR barcode.
    • Took part in a larger project to develop the first miniaturized technology to monitor temperature exposure of vials containing the oral polio vaccine, which satisfies the World Health Organization’s (WHO) PQS VVM performance specification.
    • Used the latest technology stack when it comes to the app's deployment.
    Technologies: Java, Android
  • Senior Android Developer

    2017 - 2018
    • Rewrote the app using MVVM and Android architecture components.
    • Integrated QR barcode detection and an intercom.
    Technologies: Java, Android
  • Android Developer

    2017 - 2017
    YouVersion (via Toptal)
    • Wrote tests and made sure that the app's main functions were properly implemented.
    Technologies: MVVP, Room, Dagger 2, OkHttp, Gradle, GitLab, Git, Espresso, Android, Kotlin
  • Android Developer

    2017 - 2017
    Pangea (via Toptal)
    • Created an Android app to communicate with a Bluetooth-connected watch that can measure heart rate and level of oxygen inside a patient's blood.
    • Processed byte data received from the device and transformed the data into usable Java classes.
    • Made login/register flow, syncing data with the server.
    • Enabled the back-end to control the device thorough the Android app.
    Technologies: Espresso, Retrofit 2, Gradle, Git, RxJava 2, REST, Android, Bluetooth
  • Senior Android Developer

    2016 - 2017
    FuboTV (via Toptal)
    • Created a streaming app that can play sports channels on the mobile device, save them for later watching, and list all the sports events two weeks in advance.
    • Built the app from the ground up, proposing tools, libraries, and overall solutions to make the app and code base in a clean and testable way.
    Technologies: Model View Presenter (MVP), Glide, Retrofit, Dagger 2, Git, Gradle, Java, Android
  • Senior Android Developer

    2016 - 2016
    Pulsr (via Toptal)
    • Created a reusable, cross-platform social network app that can propose events to go to or guide you to the important places inside the selected city.
    • Worked with an existing codebase, refactoring the app to be as testable as possible.
    • Introduced the Google Maps API.
    Technologies: Clean Architecture, Glide, Realm, Retrofit, Java, Android
  • Senior Android Developer

    2016 - 2016
    • Worked on a device that connects to the car's onboard computer over Bluetooth using an ODB interface and then extracts, process, and displays all the relevant data like errors on the car, trip logs, last parked position, etc., on the Android device.
    Technologies: Bluetooth, Java, Android
  • Senior Android Developer

    2015 - 2016
    MERA Software Services
    • Worked on an app that streams various TV content to mobile devices using HLS and Media Player frameworks.
    • Integrated different type of analytics (Nielsen, Omniture and Comscore) to the existing video player.
    Technologies: ExoPlayer, Glide, Dagger, GSON, Retrofit, Android SDK, Java
  • Android Developer

    2014 - 2015
    • Contributed to projects for Plantronics.
    • Developed features for a smart Bluetooth fitness watch, using Bluetooth Low Energy (BLE) for communication between device and phone.
    • Worked with Sony Mobile, implementing features and maintaining the Calendar and Alarm applications.
    • Developed a small Android app for indoor navigation using Bluetooth Low Energy (BLE) beacons.
    Technologies: Android SDK, Java
  • Android Developer

    2012 - 2014
    Mitec, d.o.o
    • Developed a chat application with integrated data encryption.
    • Developed a SQLite database and complete UI of the application.
    Technologies: Android SDK, Java
  • Web Developer

    2009 - 2009
    Univerzijada 2009
    • Built a dynamic picture gallery and a scoreboard with live results.
    • Maintained the Univerzijada website.
    Technologies: MySQL, PHP


  • Awe Everywhere

    AWE is the powerful app platform for branded video delivery and engagement across all major platforms.

  • Sony Mobile Calendar and Alarm

    Custom Sony Mobile Calendar and Alarm app.


  • Frameworks

    Dagger 2, Android SDK, Dagger, Glide
  • Libraries/APIs

    Retrofit, Retrofit 2, RxJava 2, SQLBrite, RxJava, GSON
  • Tools

    GitLab, GitHub, AutoValue, Android Studio, Eclipse IDE, Gradle, Git, ExoPlayer
  • Paradigms

    Agile Software Development, Model View Presenter (MVP), Model View Viewmodel (MVVM), Clean Architecture, Android Material Design, REST, MVVP
  • Platforms

    Android, Linux
  • Languages

    Kotlin, Java, PHP, SQL, Python, C, JavaScript, C++
  • Storage

    Realm Database, MySQL, Realm
  • Other

    GitFlow, OkHttp, Bluetooth, Espresso, Room


  • Bachelor's (Hons) Degree in Electrical Engineering and Computing (Computer Science and Informatics)
    2002 - 2013
    Faculty of Mathematics - Belgrade, Serbia

To view more profiles

Join Toptal
Share it with others