Maxime Ferrier

Main challenge: Technical leadership of the most critical scope of the application (Conversion Funnels, Order Validation, and Payment). The architecture and code maintained by my team handle a financial flow of €1.2 billion per year.

Revenue Generation (Friction Reduction): Design and deployment of the "Pay with last used payment method" feature. Estimated potential gain: + €115 million per year.

Creation of New Growth Levers: End-to-end technical implementation of "Pre-order" funnels and the "Non-food" purchase journey. Integration of 3 and 4 installments payments to increase the average order value.

Retention Optimization: Technical framing and complete redesign of the "Order Complement" funnel to streamline the user experience.

Management & Mentoring: Technical direction and supervision of a team of 5 to 11 Android developers.

Modernization of the Technical Foundation: Leading the team's skill development and complete migration of interfaces to Jetpack Compose, coupled with a strict transition to MVVM and Clean Architecture standards.

International Vision: Technical framing and facilitation of decision-making bodies for the creation of the future "Carrefour Monde" Mobile Design System.

Reduction of Technical Debt: Dismantling of the historical "Carrefour Pay" module to reduce the application's footprint, simplify the codebase, and boost overall performance.

Kotlin, Jetpack Compose, Coroutines, Hilt, Retrofit, Paging3, ViewPager3, MVVM, Clean Architecture, JUnit, Mockito.

Main challenge: Critical audit and security of the Android SDK deployed to major clients (Royal Canin, Wingly, Bricks.co). As a third-party solution integrated into high-traffic applications, SDK stability was paramount (an SDK flaw crashes the host application).

Securing B2B Deployments: Eradication of crash risks and code reliability to ensure Told's clients have uninterrupted data collection (CSAT, CES, payment funnels) without degrading their own application.

Consulting and Technical Roadmap: Delivery of an exhaustive audit report for management. This document served as the foundation for approving immediate fixes and defining the SDK's long-term evolution strategy.

Code Audit & Rescue: In-depth analysis of the existing codebase to identify bottlenecks, isolate memory leaks, and fix stability issues.

Architectural Redesign: Transition of the SDK to Clean Architecture standards. The objective: make the code modular, facilitate debugging by internal teams, and accelerate the time-to-market for future features.

"Invisible" Performance: Complete rewrite of asynchronous management (Kotlin Coroutines) to ensure the SDK's background operation consumes no perceptible resources on the end-user's phone.

Kotlin, Advanced Coroutines, Clean Architecture, API/SDK Development, Performance Audit.

Context: Crisis audit and rescue of a multi-brand application (3 flavors). The objective: stop user attrition (chronic instability) and unblock a team hindered by massive architectural debt.

Rescue & Retention: 15% reduction in crashes. Transition from an unstable app (90% crash-free) to market excellence standards (> 98%).

Time-To-Market Halved: The architectural redesign accelerated feature delivery and drastically reduced maintenance costs.

QA Productivity: Increased team autonomy and POC of a shared UI testing tool (iOS/Android) to support the Product Owner and secure production releases.

Audit & Action Plan: Complete code audit leading to a clear technical roadmap.

Restructuring: End of the "spaghetti" architecture (circular dependencies). Deployment of strict Clean Architecture across all 3 variants.

Critical Issue Resolution: Correction of multiple memory leaks and silent crashes.

DevEx (Developer Experience): Migration from Gradle Groovy to Kotlin DSL and Version Catalog (.toml) to centralize libraries and avoid conflicts.

Mentoring: Training the team on Google standards (Jetpack Compose, Coroutines) and technical framing of new features.

Design Synergy: Creation of an internal "Design System" app for graphic designers (color/Dark Mode testing) and workshops on animations.

Kotlin, Jetpack Compose, Coroutines, Clean Architecture, Koin, Firebase, Retrofit, Gradle Kotlin DSL.