Aleksandar S.

Aleksandar S.

Software Engineer

Serbia
Betroet medlem siden 2025
15 års erfaring

Han har samarbejdet med globale mærker som Coca-Cola, Nike, Deloitte og Johnson & Johnson gennem både uafhængige projekter og konsulentaftaler. På Circle Medical, han førte Android og iOS-hold, implementeret CI/CD automatisering, og boostet mobil ydeevne med 300%.

Aleksandar er anerkendt for at skabe effektive udviklingsprocesser, opretholde kodebaser af høj kvalitet, og give teams mulighed for at nå og overskride deres mål, konsekvent levere effektfulde og pålidelige mobile løsninger.

Hovedekspertise

FlutterFlutter5 år
DartDart5 år
AndroidAndroid15 år
Mobile15 år
39+

Erfaring15

Circle Medical Technologies

Mobile Tech Lead

Circle Medical Technologies
Healthcare
Sep 2020 - Jan 2024 · 3å 4m
  • Led Android og iOS-teams, kørsel af produkt levering og vedligeholdelse af tilpasning mellem ingeniør-, design- og forretningsmål.
  • Gennemførte tekniske køreplaner, kodningsstandarder og arkitekturretningslinjer, forbedring af kodekvalitet og reduktion af teknisk gæld.
  • Administreret leje og onboarding af over 15 ingeniører, voksende mobile team med 300% og indføre skalerbare agile processer.
  • Designet test automation rammer og kontinuerlig integration rørledninger, øge udgivelse frekvens samtidig bevare HIPAA overholdelse.
  • Partnerskab med ledere og interessenter til at tilpasse ingeniør-KPI'er til OKRs, balancerende produkthastighed og langsigtet vedligeholdelse.
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 · 1å 5m
  • Medstiftet virksomheden, der definerer produktvision, køreplan og langsigtet strategi.
  • Led arkitektur design og udvikling af IoT-platformen, der integrerer cloud-baseret automatisering og analytics.
  • Opbygget en skalerbar API-infrastruktur og kommunikationslag mellem IoT-enheder, mobile apps og backend-tjenester.
  • Definerede projektmilepæle, førte et tværfunktionelt ingeniørhold, og sikrede rettidig levering af nye funktioner.
  • Repræsenteret Meeliana ved branchearrangementer, investormøder og acceleratorprogrammer, sikre tidlig finansiering.
AWSAWS
AndroidAndroid
KotlinKotlin
REST APIREST API
MQTT
2+

Senior Mobile Engineer

MindTrust Labs
Marketing and Advertising
Apr 2019 · 7å
  • Led end-to-end udvikling af syv mobile applikationer på tværs af fitness, sundhedspleje og finanssektorer, med fokus på ydeevne, brugervenlighed og vedligeholdelse.
  • Designet og implementeret Flutter applikationer ved hjælp af BLoC til statslig ledelse, integration REST API'er, Firebase, og WebRTC til real-time kommunikation og multimedie-behandling.
  • Udviklede og vedligeholdt CI/CD-rørledninger ved hjælp af GitHub Handlinger, der muliggør automatiserede bygninger, test og implementeringer, og reducerer frigivelsestiden med 35%.
  • Gennemført performance profilering og optimering på både Android og iOS, forbedre app opstart tider og reducere hukommelsesforbrug.
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 · 1å 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 · 1å 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 · 5å

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 · 10å 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 · 1å 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 · 14å 9m
  • Bygget Android og Flutter applikationer til nystartede med hurtige MVP cyklusser.
  • Leverede multi-sprog, offline-kompatible mobile apps ved hjælp af Room, Retrofit og WorkManager.
  • Integrerede Firebase-tjenester til analyse, ekstern konfiguration og nedbrudsrapportering.
  • Refactored arv Java apps til Kotlin, reducere kode størrelse og forbedre vedligeholdelse.
  • Bygget flere Android og web-projekter for små virksomheder og non-profits.
  • Integrerede API'er såsom JustGiving, Twitter, Google Maps, og PayPal bruger OAuth.
  • Leveret dynamiske hjemmesider med JavaScript og jQuery for interaktive frontends.
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 · 2å
  • 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 · 2å

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

Vurderinger

Ingeniørmæssig fremragendehed

Aleksandar samlede præstation i en 90-minutters teknisk vurdering i realtid er blandt de top 5% bedst kontrollerede Software Engineer hos Proxify.

Portefølje

Fremhævet af 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.

Varighed8m

Andre projekter 33

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

Uddannelse

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

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