Aleksandar S.

Software Engineer

Aleksandar er Senior Software og Mobile Engineer, med over 14 års erfaring, spesialiserer seg på å utvikle lokale og kryss-plattform-apper som bruker Android, iOS, og Flutter. Han kombinerer dyp teknisk kompetanse med leder- og mentorkompetanse for å hjelpe lag med å levere stabile, skalerbare og brukerorienterte mobile produkter.

Han har samarbeidet med globale merkevarer som Coca-Cola, Nike, Deloitte, og Johnson & Johnson gjennom uavhengige prosjekter og konsultasjoner. Ved Circle Medical ledet han Android og iOS team som implementerte CI/CD-automatisering og styrket mobilitet med 300 %.

Aleksandar anerkjennes for å skape effektive utviklingsprosesser, vedlikeholde kodebaser av høy kvalitet, og sette lag i stand til å nå og overstige sine mål, konsekvent levere virkelige og pålitelige mobilløsninger.

Hovedekspertise

  • Flutter
    Flutter 5 år
  • Dart
    Dart 5 år
  • Android
    Android 15 år

Andre kunnskaper

  • Google Maps
    Google Maps 9 år
  • Mocha.js
    Mocha.js 2 år
  • Zustand
    Zustand 2 år
Aleksandar

Aleksandar S.

Serbia

Kom i gang

Utvalgt opplevelse

Arbeidserfaring

  • Mobile Tech Lead

    Circle Medical Technologies - 3 years 4 months

    • Låste Android- og iOS-team, kjøreleveranser og vedlikehold av produktene, mellom prosjektering, design og forretningsmål.
    • Gjennomførte tekniske veikart, kodestandarder og arkitektur, retningslinjer for bedre kodekvalitet og redusert teknisk gjeld.
    • Bruk av arbeidsleie og onboarding av over 15 ingeniører, med 300 % i vekst av mobillaget og innføring av skalerbare agleprosesser.
    • Designet testautomatiseringsrammeverk og kontinuerlig integrasjonsrørledninger, økende utslippshyppighet samtidig som HIPAA overholder samsvar.
    • Partner med ledere og interessenter for å samordne KPI-er med OKR, produkthastighet og vedlikehold på lang sikt.

    Teknologier:

    • Teknologier:
    • Android Android
    • Swift Swift
    • Kotlin Kotlin
    • Firebase Firebase
    • MVVM MVVM
    • Agile Agile
    • REST API REST API
    • Team Leading
    • Android Jetpack Android Jetpack
  • Senior Android Engineer

    Konstrukt - 10 months

    A healthcare software startup focused on building mobile tools to help doctors accurately calculate pediatric medication doses.

    • Developed both Android and iOS native applications, ensuring accuracy, reliability, and medical safety.

    • Designed and implemented a precise dosage calculation system, minimizing input errors.

    • Collaborated with medical consultants and product teams to align design and data validation.

    • Participated in developer hiring and conducted technical interviews.

    Teknologier:

    • Teknologier:
    • Android Android
    • iOS iOS
    • Swift Swift
    • Kotlin Kotlin
    • REST API REST API
    • SwiftUI SwiftUI
    • Android Jetpack Android Jetpack
    • Android NDK Android NDK
  • Co-Founder & Platform Lead

    Meeliana - 1 year 5 months

    • Samarbeidet med selskapet å definere produktvisjonen, veikartet og langsiktig strategi.
    • Led the architecture design and development of the IoT platform integrating cloud-based automation and analytics.
    • Bygget et et skalerbart API-infrastruktur og kommunikasjonslag mellom IoT-enheter, mobilapper og administratortjenester.
    • Definerte prosjektmilepæler, ledet et team som jobber med kryssfunksjoner, og sikret tidsriktig levering av nye funksjoner.
    • Representert Meeliana fra næringslivet, investormøter og akselererende programmer som sikrer tidlig finansiering.

    Teknologier:

    • Teknologier:
    • AWS AWS
    • Android Android
    • Kotlin Kotlin
    • REST API REST API
    • MQTT
    • Internet of Things (IoT)
    • BLE BLE
  • Senior Mobile Engineer

    MindTrust Labs - 7 years

    • Endelig utvikling av syv flyttbare søknader på tvers av egnethet, helse og finanssektorer, med fokus på prestasjon, brukervennlighet og vedlikehold.
    • Designede og implementerte Flamming-applikasjoner ved hjelp av BLoC for statlig styring, integrering av REST APIer, Firebase og WebRTC for sanntids kommunikasjon og multimediabehandling.
    • Utviklet og vedlikeholdt CI/CD-rørledninger ved hjelp av GitHub Actions, og muliggjør automatiserte bygg, testing og distribusjon, og redusere utgivelsestiden med 35%.
    • Gjennomført ytelsesprofilering og optimalisering både på Android og iOS, forbedrer oppstart av apper og reduserer minnebruken.

    Teknologier:

    • Teknologier:
    • AWS AWS
    • Flutter Flutter
    • Android Android
    • iOS iOS
    • Swift Swift
    • Firebase Firebase
    • Dart Dart
    • REST API REST API
    • WebRTC WebRTC
    • Bloc Bloc
    • SwiftUI SwiftUI
    • GitHub Actions GitHub Actions
  • Community Leadership & Public Speaking

    Niš Tech Community - 1 year 9 months

    • Organized meetups, workshops, and conferences for regional developer communities.

    • Delivered public talks on mobile development, freelancing, and remote collaboration.

    • Helped grow the local engineering network tenfold through mentorship and advocacy.

  • Lead Mobile Engineer (Consultant)

    INGSOFTWARE - 10 months

    A technology company developing connected fitness applications integrating BLE sensors and wearables.

    • Led iOS application architecture redesign using MVVM and RxSwift to improve code maintainability.

    • Improved Bluetooth communication reliability from 70% to nearly 100% through optimized multithreading.

    • Built abstract communication layers for BLE devices, supporting multiple sensor types and vendors.

    • Created a local iOS server with Swifter to mock APIs, enabling offline development.

    • Delivered a proof-of-concept Android version using Kotlin for cross-platform testing.

    Teknologier:

    • Teknologier:
    • Swift Swift
    • Kotlin Kotlin
    • MVVM MVVM
    • Realm Realm
    • Alamofire Alamofire
    • BLE BLE
  • Lead Android Engineer

    Johnson & Johnson Health and Wellness Solutions - 1 year 3 months

    J&J’s Health and Wellness division develops digital solutions supporting healthy lifestyles, preventive care, and chronic disease management.

    • Led development of multiple HIPAA-compliant mobile applications used by thousands of patients.

    • Designed modular Android architecture to support dynamic content updates and multi-device sync.

    • Integrated apps with Salesforce backends using complex synchronization algorithms.

    • Mentored 5+ developers, conducted weekly code reviews, and optimized CI/CD pipelines for consistency.

    • Ensured code quality, performance, and scalability through strict review and test standards.

    Teknologier:

    • Teknologier:
    • Java Java
    • Jenkins Jenkins
    • Kotlin Kotlin
    • Retrofit Retrofit
    • MVVM MVVM
    • Jira Jira
    • Dagger
    • Salesforce Salesforce
  • Android Team Lead (Consultant)

    Infinite Leap - 11 months

    Infinite Leap provides location and asset management solutions for healthcare and logistics enterprises.

    • Managed Android team delivery cycles and introduced structured sprint planning and retrospectives.

    • Defined and enforced coding standards, improving overall codebase consistency and quality.

    • Implemented code review and testing workflows, reducing bugs pre-release.

    • Collaborated with PMs and designers to align mobile roadmap with client requirements.

    Teknologier:

    • Teknologier:
    • Java Java
    • Retrofit Retrofit
    • Jira Jira
    • Git Git
    • Dagger
  • Lead Android Engineer

    Circle Medical - 5 years

    Core member of the mobile team responsible for building Circle Medical’s Android platform from the ground up and scaling it to tens of thousands of active users.

    • Developed HIPAA-compliant Android applications using Java and Kotlin, transitioning the app architecture from MVP to MVVM.

    • Implemented mission-critical features such as video consultations, chat messaging, payment processing, insurance scanning, and PDF viewing.

    • Integrated SDKs like ZoomUS, Stripe, Acuant, and PubNub for communication, payments, and real-time data streaming.

    • Designed modular architecture, enabling parallel feature development across teams and improved scalability.

    • Set up automated test suites using Espresso, JUnit, and Mockito, increasing stability and reducing crash rates by 40%.

    • Collaborated with backend teams to ensure data synchronization and compliance with healthcare standards.

    Teknologier:

    • Teknologier:
    • Java Java
    • Android Android
    • Kotlin Kotlin
    • Firebase Firebase
    • Retrofit Retrofit
    • Mockito Mockito
    • Espresso Espresso
    • MVVM MVVM
    • JUnit JUnit
    • Agile Agile
    • Dagger
    • Team Leading
    • Gradle Gradle
    • Stripe Stripe
    • Android Jetpack Android Jetpack
    • Bitrise Bitrise
  • Senior Mobile Engineer

    Toptal - 10 years 10 months

    Client Engagements:

    • Led dozen mobile projects for clients ranging from startups to global enterprises, including Nike, Coca-Cola, and Johnson & Johnson

    • Served as Lead Mobile Engineer for a Y Combinator–funded startup, delivering a highly optimized mobile application

    • Achieved 99.5% app stability, reduced crash rates by 40%, and supported a 20% increase in user base within 6 months

    Leadership & Mentoring:

    • Led 3 major delivery projects, including projects within Johnson & Johnson, ensuring 100% on-time delivery through improved processes and clear technical direction

    • Mentored 5+ junior developers through weekly code reviews and pair programming, contributing to 30% reduction in development time as well as improved code quality and increased team productivity and client satisfaction.

    Teknologier:

    • Teknologier:
    • Java Java
    • Android Android
    • iOS iOS
    • Swift Swift
    • Kotlin Kotlin
    • Retrofit Retrofit
    • Dagger
    • Realm Realm
    • RxSwift RxSwift
  • CEO & Android Team Lead

    Singularity Software - 1 year 3 months

    Founded a software agency specializing in Android development, delivering products for startups and enterprise clients worldwide.

    • Managed a 13-member development team delivering 15+ Android applications.

    • Architected an enterprise-grade app for the oil industry with dynamic UI generation from REST APIs.

    • Rebuilt and modernized “My Diet Coach,” integrating Material Design and CI/CD — scaling the app to over 10M users.

    • Promoted clean architecture, automation testing, and open-source adoption across the team.

    Teknologier:

    • Teknologier:
    • AWS AWS
    • Java Java
    • Retrofit Retrofit
    • Travis CI Travis CI
    • Bluetooth Bluetooth
    • NFC
  • Senior Android Engineer

    Scopic Software - 7 months

    Scopic Software builds custom software solutions for global clients in healthcare, education, and entertainment.

    • Developed six Android apps integrating Google APIs and third-party REST services.

    • Implemented a Java-based heart rate detection algorithm using fingertip image analysis.

    • Established internal code standards and reusable libraries to improve efficiency.

    Teknologier:

    • Teknologier:
    • Java Java
    • Android Android
    • Retrofit Retrofit
    • Espresso Espresso
  • Mobile Engineer

    Various Clients - 14 years 9 months

    • Bygget Android og flammeprogrammer til oppstart med raske MVP sykluser.
    • Leverte multi-språk, offline-capable mobile apps using Room, Retrofit and WorkManager.
    • Integrerte brannbasetjenester for analyse, fjernkonfigurasjon og krasjrapportering.
    • Refaktorerte tidligere Java-apper til Kotlin, redusere kodestørrelsen og forbedre vedlikehold.
    • Bygget flere Android-prosjekter og nettprosjekter for små bedrifter og ulønner.
    • Integrerte APIer som JustGiving, Twitter, Google Maps, og PayPal bruker OAuth.
    • Leverte dynamiske nettsteder med JavaScript og jQuery for interaktive frontender.

    Teknologier:

    • Teknologier:
    • PHP PHP
    • HTML HTML
    • CSS CSS
    • jQuery jQuery
    • Flutter Flutter
    • Java Java
    • Android Android
    • Swift Swift
    • Kotlin Kotlin
    • Firebase Firebase
    • Retrofit Retrofit
    • MVVM MVVM
    • OAuth2 OAuth2
    • Dagger
    • Realm Realm
    • Material-UI Material-UI
    • REST API REST API
  • Android & Web Developer (Freelance)

    Various Clients - 2 years

    • Built multiple Android and web projects for small businesses and non-profits.

    • Integrated APIs such as JustGiving, Twitter, Google Maps, and PayPal using OAuth.

    • Delivered dynamic websites with JavaScript and jQuery for interactive frontends.

    Teknologier:

    • Teknologier:
    • PHP PHP
    • JavaScript JavaScript
    • HTML HTML
    • CSS CSS
    • jQuery jQuery
    • Java Java
    • OAuth2 OAuth2
    • REST API REST API
  • Software Developer

    Microsoft Development Center Serbia (MDCS) - 2 years

    Microsoft Development Center Serbia is one of Microsoft’s global R&D hubs, focusing on software innovation and distributed systems.

    • Developed internal tools and test automation systems for Windows and Office teams.

    • Contributed to UI automation frameworks for validation of Windows mobile components.

    • Assisted in backend service design for telemetry data ingestion.

    • Participated in agile sprints, bug triaging, and code quality reviews.

    • Collaborated with cross-functional global teams to align software integration processes.

    Teknologier:

    • Teknologier:
    • MSSQL MSSQL
    • C# C#
    • .NET .NET
    • DevOps DevOps
    • WPF WPF
    • Agile Agile

Utdannelse

  • MSc.Computer Science and Software Engineering

    University of Nis, Serbia · 2011 - 2014

  • BSc.Computer Engineering

    University of Nis, Serbia · 2007 - 2011

Portefølje

  • Sharpen - 1
  • Sharpen - 2
  • Certified Quality Foods - 1
  • Certified Quality Foods - 2
  • Circle Medical - 1
  • Circle Medical - 2
  • Tribe Safe - 1
  • Tribe Safe - 2
  • Tribe Safe - 3
  • Tribe Safe - 4
  • Tribe Health Telemedicine - 1
  • Tribe Health Telemedicine - 2
  • Tribe Health Telemedicine - 3
  • Tribe Health Telemedicine - 4
  • Tribe Health Telemedicine - 5
  • Tribe Health Telemedicine - 6
  • Tribe Health Telemedicine - 7
  • Tribe Health Telemedicine - 8
  • Podium - 1
  • Podium - 2
  • Podium - 3
  • Podium - 4
  • Podium - 5
  • Podium - 6
  • Beyond Pulse - 1
  • Beyond Pulse - 2
  • Johnson & Johnson Health Partner - 1
  • Plickers - 1
  • Plickers - 2
  • Plickers - 3
  • FitzApp - 1
  • My Diet Coach - 1
  • My Diet Coach - 2
  • Fat Finger - 1
  • Fat Finger - 2
  • Nike Techbook - 1
  • Nike Techbook - 2
  • Epicuri - 1
  • NFC Scanner - 1
  • BookingApp - 1
  • BookingApp - 2
  • BookingApp - 3
  • BookingApp - 4
  • HDSereneScapes - 1
  • HDSereneScapes - 2
  • HDSereneScapes - 3
  • Hollywood Walk of Fame - 1
  • Hollywood Walk of Fame - 2
  • Winggit - 1
  • Winggit - 2
  • Winggit - 3
  • Winggit - 4
  • Winggit - 5
  • Everyday Wallpaper - 1
  • Personal Movie Prioritizer - 1
  • Contour Map - 1
  • Heart Rate Monitor - 1
  • ThoughtFI - 1
  • ThoughtFI - 2
  • ThoughtFI - 3
  • Gorilla Weight Lifting - 1
  • Gorilla Weight Lifting - 2
  • Gorilla Weight Lifting - 3
  • Gorilla Weight Lifting - 4
  • Million Beats - 1
  • Million Beats - 2
  • Million Beats - 3
  • Million Beats - 4
  • Million Beats - 5
  • Million Beats - 6
  • Photo Funhouse - 1
  • Royal Children's Hospital - 1
  • Royal Children's Hospital - 2
  • Royal Children's Hospital - 3
  • Royal Children's Hospital - 4
  • Elder Pilot - 1
  • Alphabet - 1
  • iLoveSweet - 1
  • Notifly - 1
  • Letrz - 1
  • Learn to develop - 1

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