Aleksandar S.

Aleksandar S.

Software Engineer

Serbia
Membre de confiance depuis 2025
15 années d'expérience

Il a collaboré avec des marques internationales telles que Coca-Cola, Nike, Deloitte et Johnson & Johnson dans le cadre de projets indépendants et de consultations. Chez Circle Medical, il dirigeait les équipes Android et iOS, implémentait l'automatisation CI/CD et augmentait les performances mobiles de 300%.

Aleksandar est reconnu pour la création de processus de développement efficaces, en maintenant des bases de code de haute qualité, et habiliter les équipes à atteindre et à dépasser leurs objectifs, en fournissant constamment des solutions mobiles efficaces et fiables.

Expertise principale

FlutterFlutter5 ans
DartDart5 ans
AndroidAndroid15 ans
Mobile15 ans
39+

Expérience15

Circle Medical Technologies

Mobile Tech Lead

Circle Medical Technologies
Healthcare
Sep 2020 - Jan 2024 · 3a 4m
  • Les équipes Android et iOS, conduisant la livraison de produits et maintenant l’alignement entre l’ingénierie, la conception et les objectifs commerciaux.
  • Mise en œuvre de feuilles de route techniques, de normes de codage et de directives d'architecture, amélioration de la qualité du code et réduction de la dette technique.
  • Gestion de l’embauche et de l’embarquement de plus de 15 ingénieurs, en développant l’équipe mobile de 300% et en introduisant des processus agiles évolutifs.
  • Conception de frameworks d'automatisation de test et de pipelines d'intégration continue, augmentation de la fréquence de sortie tout en maintenant la conformité HIPAA.
  • Partenariat avec les dirigeants et les parties prenantes pour aligner les ICP d'ingénierie avec les OKR, équilibrant la vitesse du produit et la maintenabilité à long terme.
AndroidAndroid
SwiftSwift
KotlinKotlin
FirebaseFirebase
MVVMMVVM
4+
Circle Medical
Konstrukt

Senior Android Engineer

Konstrukt
Healthcare
Sep 2020 - Jul 2021 · 10m

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.

AndroidAndroid
iOSiOS
SwiftSwift
KotlinKotlin
REST APIREST API
3+
Meeliana

Co-Founder & Platform Lead

Meeliana
Healthcare IT
Aug 2019 - Jan 2021 · 1a 5m
  • Cofondateur de la société, définissant la vision du produit, la feuille de route et la stratégie à long terme.
  • Dirigé la conception et le développement de l'architecture de la plate-forme IoT, intégrant l'automatisation et l'analyse basée sur le cloud.
  • Construire une infrastructure API évolutive et une couche de communication entre les appareils IoT, les applications mobiles et les services d'arrière-plan.
  • Des jalons de projet définis, ont conduit une équipe d'ingénierie transversale et ont assuré la livraison en temps opportun de nouvelles fonctionnalités.
  • Représentait Meeliana lors d’événements de l’industrie, de réunions d’investisseurs et de programmes d’accélérateur, en obtenant un financement précoce.
AWSAWS
AndroidAndroid
KotlinKotlin
REST APIREST API
MQTT
2+

Senior Mobile Engineer

MindTrust Labs
Marketing and Advertising
Apr 2019 · 7a
  • Développer de bout en bout sept applications mobiles dans tous les secteurs de la forme, de la santé et de la finance, en mettant l’accent sur la performance, l’ergonomie et la maintenabilité.
  • Conception et implémentation d'applications Flutter utilisant BLoC pour la gestion d'état, intégration des API REST, Firebase et WebRTC pour la communication en temps réel et le traitement multimédia.
  • Développer et maintenir des pipelines CI/CD en utilisant GitHub Actions, permettre des compilations, des tests et des déploiements automatisés, et réduire le temps de publication de 35%.
  • Profilage et optimisation des performances sur Android et iOS, améliorant le temps de démarrage des applications et réduisant l'utilisation de la mémoire.
AWSAWS
FlutterFlutter
AndroidAndroid
iOSiOS
SwiftSwift
7+
Sharpen
Certified Quality Foods
Tribe Safe
Tribe Health Telemedicine
Podium

Community Leadership & Public Speaking

Niš Tech Community
Information Technology (IT) and Services
Sep 2018 - Jun 2020 · 1a 9m
  • 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.

INGSOFTWARE

Lead Mobile Engineer (Consultant)

INGSOFTWARE
Sports and Fitness Tech
Dec 2017 - Oct 2018 · 10m

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.

SwiftSwift
KotlinKotlin
MVVMMVVM
RealmRealm
AlamofireAlamofire
BLEBLE
Beyond Pulse
Johnson & Johnson Health and Wellness Solutions

Lead Android Engineer

Johnson & Johnson Health and Wellness Solutions
Healthcare IT
Oct 2017 - Jan 2019 · 1a 3m

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.

JavaJava
JenkinsJenkins
KotlinKotlin
RetrofitRetrofit
MVVMMVVM
3+
Johnson & Johnson Health Partner
Infinite Leap

Android Team Lead (Consultant)

Infinite Leap
Information Technology (IT) and Services
Feb 2016 - Jan 2017 · 11m

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.

JavaJava
RetrofitRetrofit
JiraJira
GitGit
Dagger
FitzApp
Circle Medical

Lead Android Engineer

Circle Medical
Healthcare
Sep 2015 - Sep 2020 · 5a

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.

JavaJava
AndroidAndroid
KotlinKotlin
FirebaseFirebase
RetrofitRetrofit
11+
Toptal

Senior Mobile Engineer

Toptal
Talent Management
Jun 2015 · 10a 10m

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.

JavaJava
AndroidAndroid
iOSiOS
SwiftSwift
KotlinKotlin
4+
Plickers
Nike Techbook
Singularity Software

CEO & Android Team Lead

Singularity Software
Information Technology (IT) and Services
Aug 2014 - Nov 2015 · 1a 3m

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.

AWSAWS
JavaJava
RetrofitRetrofit
Travis CITravis CI
BluetoothBluetooth
NFC
My Diet Coach
Fat Finger
Epicuri
NFC Scanner
BookingApp
+3
Scopic Software

Senior Android Engineer

Scopic Software
Information Technology (IT) and Services
Jan 2014 - Aug 2014 · 7m

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.

JavaJava
AndroidAndroid
RetrofitRetrofit
EspressoEspresso
Personal Movie Prioritizer
Contour Map
Heart Rate Monitor
ThoughtFI
Gorilla Weight Lifting
Photo Funhouse
Various Clients

Mobile Engineer

Various Clients
Information Technology (IT) and Services
Jul 2011 · 14a 9m
  • Des applications Android et Flutter conçues pour les startups avec des cycles MVP rapides.
  • Des applications mobiles multilingues et hors ligne à l'aide de Salle, de Retrofit et de WorkManager.
  • Services Firebase intégrés pour l'analytique, la configuration à distance et le rapport de plantage.
  • Refactorisation des anciennes applications Java vers Kotlin, réduisant la taille du code et améliorant la maintenabilité.
  • Construit plusieurs projets web et Android pour les petites entreprises et sans but lucratif.
  • Des API intégrées telles que JustGiving, Twitter, Google Maps, et PayPal en utilisant OAuth.
  • Des sites web dynamiques avec JavaScript et jQuery pour les frontends interactifs.
PHPPHP
HTMLHTML
CSSCSS
jQueryjQuery
FlutterFlutter
12+
Everyday Wallpaper
Elder Pilot
Alphabet
Notifly
Various Clients

Android & Web Developer (Freelance)

Various Clients
Remote Work and Collaboration
Jul 2011 - Jul 2013 · 2a
  • 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.

PHPPHP
JavaScriptJavaScript
HTMLHTML
CSSCSS
jQueryjQuery
3+
Million Beats
Royal Children's Hospital
iLoveSweet
Letrz
Learn to develop

Software Developer

Microsoft Development Center Serbia (MDCS)
Information Technology (IT) and Services
Jun 2010 - Jun 2012 · 2a

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.

MSSQLMSSQL
C#C#
.NET.NET
DevOpsDevOps
WPFWPF
AgileAgile

Évaluations

Excellence en ingénierie

Les performances globales de Aleksandar lors d'une évaluation technique en direct de 90 minutes se classent dans le top 5% des Software Engineer évalués chez Proxify.

Portefeuille

Mis en avant par Aleksandar

Sharpen 2
May 2025 · MindTrust Labs
Sharpen

Sharpen is a study and exam preparation platform that helps college students learn, practice, and prepare for exams through structured, textbook-aligned content.

Role & Contribution: Maintained and enhanced a large-scale iOS application using Swift, contributing across the full development lifecycle. Implemented new features and integrations while refactoring code to improve maintainability, scalability, and performance. Developed custom UI components and led the adoption of SwiftUI and MVVM, modernizing the UI layer and improving developer efficiency. Identified and resolved bugs, reducing technical debt and improving overall app stability. Researched and evaluated new tools, SDKs, and services, contributing to technical decision-making.

Durée8m

Autres projets 33

Certified Quality Foods
Circle Medical
Tribe Safe
Tribe Health Telemedicine
Podium
+28

Éducation

UON
University of Nis, Serbia
Computer Science and Software Engineering2011 - 2014
UON
University of Nis, Serbia
Computer Engineering2007 - 2011

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