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Edgar RossantER

Edgar Rossant

Senior iOS & Flutter Developer

€550/day
13 projects
Royan, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Edgar

Launching a new app or need to refactor an existing app that has become difficult to maintain?
I work as a freelancer to design and develop **reliable and scalable mobile applications**, in Swift (UIKit / SwiftUI) or Flutter, depending on your needs.



**My goal**: to deliver a healthy, performant, and scalable foundation – with clear, testable code, and a regular delivery pace.


I specialize in:
  • Creating clean architecture from the start (MVVM, Coordinator, Clean Architecture)
  • Developing from scratch in Swift or Flutter
  • Progressive migration (UIKit to SwiftUI, or to Flutter Web / mobile)
  • Modernizing apps with technical debt
  • Optimizing performance, stability, and testability
Concrete examples:
  • Complete refactoring of the Bazarchic app (e-commerce): transition from Objective-C to Swift, then to SwiftUI. Result: 0 crashes in production, increased performance, +3 years of collaboration.
  • Flutter Web & mobile development for a financial management app: modular architecture, responsive design, and adaptation to strict web constraints.
  • Personal apps published on the App Store: Jetlag, Abot, Cute Daily ToDo...
Why my clients recommend me:
  • Completeautonomyon the mobile side
  • Clear, organized, easilymaintainablecode
  • Smooth collaboration with PO, backend, and design
  • Focus on product impact: stability, performance, scalability
Need a reliable person to build or evolve an app the right way?

Let's talk, I am available part-time or full-time depending on the period.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • SNAPP' - AMFIE
    AMFIE – Freelance Flutter Developer
    BANKING AND INSURANCE
    January 2025 - Today (1 year and 5 months)
    From scratch creation of a Web & mobile financial management app.

    I work as a Flutter developer to design and develop a Web & mobile financial management application for AMFIE members.

    The project started from scratch: I set up the technical architecture, designed reusable UI components, and structured all the code according to Clean Architecture principles, with a strong separation of concerns and well-controlled global state via Riverpod.

    Results and value delivered:

    • **Full responsive Web & mobile app**, with a fluid and consistent UX across all screen sizes
    • **Scalable and modular architecture**, facilitating the onboarding of other developers and product scalability
    *Creation of dynamic and configurable widgetsfor tables, cards, charts, and filters

    *Typed navigation with GoRouterfor clear, structured, and maintainable routing
    • **Integration of complex financial data**, conditional display, and encapsulated business logic
    *Close collaboration with the product teamto quickly deliver stable and complete screens


    Technologies and tools:

    Flutter, Dart, Flutter Web, Riverpod (Freezed), GoRouter, Clean Architecture, Responsive Layout, Charting, Table Widgets, Modular Design


    This project allowed me to demonstrate my ability to create a complex and robust app from the start, deliver a clear and sustainable architecture, and contribute significantly to the product vision in a demanding context.
    Flutter Riverpod GoRouter Clean Architecture Flutter Web
  • BazarChic
    Freelance iOS Developer - Full Remote
    E-COMMERCE
    September 2021 - November 2024 (3 years and 1 month)
    Paris, France
    For **3 years**, I led the in-depth transformation of BazarChic's iOS app, used daily by millions of users.

    Starting from an aging Objective-C foundation (UIKit, MVC), I initiated a structured modernization: adopting Swift, incremental refactoring of screens, then migrating to SwiftUI and the MVVM architecture.

    Concrete results:

    *0 crashes in productionafter refactoring critical screens

    *Modernized, testable, and well-structured code base(MVVM, Coordinators, DI)
    • **Smoother user experience**, faster navigation, and more responsive animations
    *Regular delivery of new featuresin coordination with product and design teams

    *Continuous performance optimization(smooth scrolling, faster loading)


    Technical environment:

    Swift, SwiftUI, Combine, UIKit, Objective-C, MVVM, Coordinators, DI, XCTest, GitLab CI/CD, Agile (Jira)

    This mission allowed me to demonstrate my ability totake charge of a complex appover the long term, delivervisible product-side results**, and **collaborate effectively remotelyin a structured environment.
    Swift UI UIKit Objective-C MVVM MVC Architecture
  • Betterise Health Tech
    Freelance iOS Mobile Developer
    MEDICAL
    September 2019 - September 2021 (2 years)
    Bordeaux, France
    I worked in a team on Theraflow, a modular iOS application in the e-health domain. From a common base, we developed several variants of medical apps deployed in production under different brands.

    The modular architecture allowed for efficient reuse of business components while meeting specific needs for different end clients.

    Features developed:

    • Tracking of treatment prescribed by a doctor, with reminders and intake validation
    • Recording and visualization of health measurements (weight, blood pressure, etc.) with connected objects
    • Independent plug-and-play modules for different user journeys
    • Regular publication of white-label apps, with CI/CD and production monitoring

    Technical Stack:

    Swift, MVVM, UIKit, Modularization, Bluetooth, NotificationCenter, Unit Tests, Git, Agile


    This project strengthened my expertise in modular development, custom e-health journey design, and continuous delivery of stable production apps in a sector demanding high quality and reliability.
    iOS Continuous Integration Swift Mobile Architecture Fastlane Unit Testing Connected Objects

Recommendations

Thomas BouniolTB
MT
Louis G.LG
+1
Thomas Bouniol and 3 other people have recommended Edgar

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Education

  • Computer Science and Information Systems Expert - Master's Degree - RNCP Level 1
    Ynov Informatique
    2019
    J’ai obtenu le titre d’Expert en Informatique et Systèmes d’Information au sein d’Ingésup (groupe Ynov), une école reconnue pour sa formation professionnalisante en ingénierie informatique. Le cursus, orienté projets et technologies d’avenir, combine enseignement académique et alternance en entreprise dès la 3e année. Je me suis spécialisé dans le développement mobile, avec une solide base en architecture logicielle, développement multiplateforme et gestion de projet. En parallèle de ma dernière année, j’ai cofondé et dirigé un laboratoire mobile dédié à l’écosystème Apple, dans lequel nous avons formé et encadré une vingtaine d’étudiants souhaitant approfondir leurs compétences en iOS. Cette expérience m’a permis de renforcer à la fois mes compétences techniques et mes capacités en transmission, coordination et leadership.
  • Scientific Baccalaureate, Computer Science
    Lycée Général Jean Giraudoux
    2013

Skill set

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