Freelancer profile translated to English.
Back to original languageAbout Sebastien
Lead iOS Engineer with 18+ years of experience in designing, developing, and deploying complex mobile applications in Swift / SwiftUI. Expertise in modular architectures, developing applications from scratch, and the modern iOS ecosystem (Swift Concurrency, SwiftData, SPM, testing, CI/CD).
Proven experience in demanding environments, including leading iOS teams and integrating advanced product-oriented, performance, and software quality features.
Profile also focused on applied AI, with experience using Ollama, Qwen, and Claude Code for experimentation, integration, and optimization of AI-assisted development workflows.
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
- Bankin'Senior iOS EngineerBANKING AND INSURANCEApril 2026 - May 2026 (1 month)Paris, France
- Bug and crash fixes that occurred during the project's migration to Swift 6, particularly concerning concurrency (async/await) and actor isolation, to stabilize the application in production.
- Resolution of multiple regressions related to the migration of UIKit views to SwiftUI (crashes, state, and navigation issues), with enhanced testing coverage and critical scenarios.
- Design and development of a new "effortless savings" feature allowing users to automatically set aside money from their daily transactions (savings rules, rounding, automation).
- H. SolutionsSenior iOS DeveloperHEALTH AND WELLNESSDecember 2025 - February 2026 (2 months)Paris, France
- Development from scratch of the Hippocrate mobile application, dedicated to preventive health and user feedback tracking.
- Design and implementation of a VIP architecture (Clean Swift) in Swift 6 / SwiftUI, with SwiftData and Swift Package Manager, to ensure modularity, maintainability, and testability.
- Development of health questionnaire and feedback tracking flows, with integration of short-loop feedback mechanisms and mobile-adapted interactions.
- Implementation of sensitive data security via Keychain, respecting the confidentiality requirements of the healthcare domain.
Integration of push notifications to enhance user engagement and health routine tracking.- Contribution to the organization of development workflows and version management via GitHub.
- 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 a MVVM-C then modern MVVM architecture (SwiftUI, Swift 6, SPM, SwiftData, Combine, async/await, AsyncStream, modular architecture) for the from-scratch development of applications to assist cancer patients and then track mental health conditions.Development of key features based on this architecture (patient journeys, forms, clinical tracking), ensuring a fluid user experience and rapid market entry with high adoption.Integration of the Mood Disorder Questionnaire (MDQ) and other MCQs for precise psychiatric condition tracking (bipolar disorder, depression), improving the quality of care and intervention effectiveness.Implementation of secure authentication via the Keycloak SDK, ensuring GDPR compliance and 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.Support for accessibility (VoiceOver, adapted journeys) to make the application usable by the maximum number of patients, in accordance with accessibility best practices.
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Education
- Bulats B2Cambridge Center2014