Sebastien Gamel

Développement d'une application mobile (iOS) à chaîne IA 100 % embarquée : OCR haute densité, analyse de texte par LLM et traduction instantanée multilingue. Architecture on-device (LLM embarqué ~4B, fine-tuning) : fonctionnement à 100 % hors-ligne, sans backend, aucune donnée personnelle transmise — zéro cloud, conformité RGPD. R&D de fiabilisation des sorties (déterminisme LLM, robustesse OCR) et optimisation de la performance sur mobile (quantification, mémoire, latence d'inférence).

Stabilized the production app after the Swift 6 migration by fixing bugs and crashes related to concurrency, including async/await and actor isolation, while strengthening test coverage on critical scenarios. Resolved UIKit-to-SwiftUI regressions during view migration, including crashes, inconsistent states, and navigation issues, and secured key user journeys. Designed and developed an automatic savings feature deployed to a user base of more than 10 million users, with personalized savings rules, transaction rounding, and automated transfers.

Built Hippocrate from scratch in Swift 6 and SwiftUI, using a modular Clean Swift (VIP) architecture, SwiftData, and SPM. Designed health questionnaire flows and wellbeing tracking journeys with short feedback loops and mobile-first interactions. Secured sensitive data with Keychain, in compliance with medical privacy requirements. Integrated push notifications to support user engagement and health routine follow-up.

Led the complete redesign of a medical iOS application deployed to global pharmaceutical partners including Biogen, Roche, Johnson & Johnson, Pfizer, and Sanofi, driving a progressive modular MVVM-C migration from UIKit to SwiftUI and significantly improving maintainability and UI consistency. Developed clinical workflows across three therapeutic areas: neurosciences, mental health, and rare diseases. Built a real-time facial detection module using the Vision framework, integrated into scientifically validated clinical assessment protocols. Delivered ARKit and CoreML proof-of-concepts to explore augmented reality and AI integration within patient journeys. Established the CI/CD pipeline, unit testing strategy, and regression-prevention practices, ensuring production stability and software quality. Secured sensitive data using Keychain and implemented VoiceOver accessibility support in line with regulatory requirements for medical applications

Lead technical developer for a team of 2 junior iOS developers: conducted code reviews, provided mentorship, and defined best practices. Developed two medical applications from scratch (oncology and psychiatry) deployed across 110 healthcare institutions including Gustave Roussy, Roche, and Bayer, with 14,000 patients under remote monitoring. Built the architecture using MVVM-C, then modern MVVM with SwiftUI, Swift 6, SPM, SwiftData, async/await, and AsyncStream. Integrated clinically validated questionnaires (MDQ and others) for psychiatric follow-up (depression, bipolarity) and oncological monitoring within structured patient journeys. Implemented secure authentication via Keycloak SDK, ensured GDPR compliance, and secured patient data. Set up GitHub CI/CD with XCTest unit tests, automated workflows, and production regression prevention. Added VoiceOver accessibility and adapted patient journeys for optimal usability across a broad patient audience.

Lead technical developer for a team of 3 junior iOS developers: conducted structured code reviews, provided daily mentorship, and promoted best practices across the team. Developed core banking features for a platform with ~3 million active users: transfers, instant transfers, account and RIB visualization, and a full navigation redesign. Optimized a modular SPM architecture (~15 packages) and CocoaPods setup, and implemented Bitrise CI for builds, automated testing, and internal deployments. Implemented unit tests using a BDD approach (Gherkin / Quick / Nimble), achieving ~80% test coverage on critical modules. Secured sensitive data via Keychain and ensured VoiceOver accessibility in compliance with banking industry standards.

Developed and deployed production-ready iOS applications for both enterprise and consumer use cases across diverse industries: industrial, transportation, banking, and aviation.