Freelancer profile translated to English.
Back to original languageAbout Sebastien
Lead / Senior iOS with over 15 years of experience in designing, developing, and deploying complex mobile applications in Swift / SwiftUI. Expert in MVVM / MVVM-C architectures, modular apps from scratch, and the modern iOS ecosystem (SwiftData, SPM, async/await, testing, CI/CD). Accustomed to critical environments (banking, health, prevention), leading iOS teams (up to 8 developers), and integrating advanced technologies (Vision, ARKit, CoreML, Keychain, accessibility).
English
Fluent
French
Native or bilingual
Can work on-site
Toulouse (up to 50km), Paris (up to 50km), Bordeaux (up to 50km), Nantes (up to 10km)
Experience
- H. SolutionsSenior iOS DeveloperHEALTH AND WELLNESSDecember 2025 - Today (6 months)Paris, France
- From scratch development of the Hippocrate mobile application, a preventive health companion focused on user experience (drowsiness, diet, physical activity, mental health) and personalized micro-actions.
- Design and implementation of a modern MVVM architecture in Swift 6 / SwiftUI with SwiftData and SPM, for a modular, scalable, and maintainable codebase.
- Implementation of health questionnaire flows and well-being tracking (sliders, short-loop feedback), aligned with behavioral models used by H. Solutions. Setup of data security via Keychain and integration with GitHub (version control, development workflows), respecting health confidentiality and prevention requirements.
- Integration of push notifications to optimize user engagement and tracking in their daily health routines.
- ResilienceSenior iOS DeveloperHEALTH AND WELLNESSApril 2022 - September 2025 (3 years and 5 months)Paris, FranceTechnical leadership of 2 iOS developers, with structured code reviews, mentoring, and definition of best practices, then taking on the role of technical lead for the iOS application.Design and implementation of an MVVM-C then modern MVVM architecture (SwiftUI, Swift 6, SPM, SwiftData, Combine, async/await, AsyncStream, modular architecture) for the from-scratch development of applications for aiding cancer patients and monitoring mental health.Development of key features based on this architecture (patient journeys, forms, clinical follow-up), ensuring a fluid user experience and rapid market entry with high adoption.Integration of the Mood Disorder Questionnaire (MDQ) and other MCQs for precise monitoring of psychiatric conditions (bipolarity, depression), improving the quality of care and intervention effectiveness.Implementation of secure authentication via the Keycloak SDK, ensuring GDPR compliance and the protection of sensitive health data.Writing unit tests with XCTest and integration into a GitHub CI/CD (automated workflows), to ensure the quality, non-regression, and stability of delivered versions.Handling accessibility (VoiceOver, adapted journeys) to make the application usable by the maximum number of patients, in accordance with accessibility best practices.
- Ad Scientiam, Paris (Remote)Senior iOS DeveloperHEALTH AND WELLNESSJanuary 2022 - November 2025 (3 years and 10 months)Paris, France
- Complete refactoring of an existing iOS application architecture in Swift (mix of UIKit + SwiftUI, Combine, async/await, AsyncStream), introducing dependency injection and a reusable modular architecture, significantly simplifying future evolutions.
Redesign and optimization of the internal architecture (MVVM-C, modular, SPM), improving the performance, testability, and flexibility of the medical monitoring application.Leading the major migration of the application to SwiftUI, reducing development time and simplifying maintenance while improving user interface consistency.Development of innovative patient monitoring features (sound-based algorithms, image capture module) for the monitoring of conditions such as multiple sclerosis, cystic fibrosis, and certain neuromuscular diseases, opening new digital diagnostic perspectives.Creation of Proof of Concepts (POCs) in ARKit and CoreML to explore the integration of augmented reality and artificial intelligence in patient journeys.Development of an iOS facial detection module with Vision Framework: use of pose angles (yaw, pitch, roll) to validate frontality and optimize real-time photo capture.Setup and maintenance of unit tests with Quick/Nimble (BDD approach) and integration into an Xcode Server CI/CD, ensuring the quality and non-regression of critical features.Securing sensitive data via Keychain and supporting accessibility (VoiceOver) to comply with security and inclusion best practices.
Reviews
Recommendations
Be the first to recommend Sebastien
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Bulats B2Cambridge Center2014