Freelancer profile translated to English.
Back to original languageAbout Maxence
Fullstack developer, 10 years of experience
I design and developbackend**, **mobile**, and **webapplications. My main languages: **Scala**, **Go**, **Swift**, **React Native**. But I don't limit myself to one technology.
What I do:
- Software architecture design (micro-services, distributed systems with **Kafka**, monoliths),
- Backend and API development (design, integration, documentation),
- iOS/cross-platform mobile applications (React Native, Swift),
- CI/CD setup (GitLab, Fastlane),
- Code review, technical choices, team support,
- Integration of AI tools in the development workflow (Claude Code, Gemini CLI…).
I work pragmatically. I support the design of functional and technical specifications before coding. Defining the framework upstream avoids unpleasant surprises.
To learn and satisfy my curiosity, I also develop personal projects in parallel.
French
Native or bilingual
English
Conversational
Can work on-site
Nantes (up to 15km)
Experience
- NICKELReact Native Mobile DeveloperBANKING AND INSURANCEMay 2023 - December 2025 (2 years and 7 months)Nantes, FranceDevelopment of the Client Area application for iOS and Android, within a team of about 8 people. I joined the project on an existing base with an established user base.Key points:
- React Native, with native Swift and Kotlin code for integrating system components and proprietary native SDKs
- Integration of Apple Pay, Google Pay provisioning and the Payconiq service (Belgium)
- JavaScript to TypeScript migration, redesign of the design system
- Bi-weekly releases with feature flipping for progressive deployment of features
- Close collaboration with UX teams
- CI/CD management with Fastlane
- NICKELScala Backend DeveloperBANKING AND INSURANCEJanuary 2019 - May 2023 (4 years and 4 months)Nantes, FranceDevelopment and maintenance of a real-time core banking system, in a demanding regulatory context, within a team that grew from a few developers to about twenty. I joined the project just after the initial go-live, there was still a lot to build, especially adapting the system for countries other than France.Key points:
- Scaling from a few thousand to 2 million customers
- Migration from a monolith to a micro-services architecture, phased over several versions, without service interruption
- Processing of large data volumes via streams (Akka Streams, fs2)
- Reading EMV frames in TCP with Scodec
- Event-driven architecture with Kafka, storage on Cassandra
- Typelevel ecosystem: Cats Effect, Tapir, http4s
- Observability: Prometheus, Warp10
- Tests: ScalaTest, ScalaCheck (property-based), RobotFramework (E2E)
- Design, development, maintenance, and code review. Collective ownership of the codebase
- CapgeminiFullstack DeveloperJanuary 2015 - January 2019 (4 years)Nantes, FranceSeveral missions carried out:
- Development of modules for a core-banking system;
- Development and maintenance of a life insurance product management application for banking advisors;
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Education
- Professional Bachelor's Degree in Information Systems and NetworksIUT de Nantes2015Développement d'applications réparties
- BTS in IT for BusinessChartres2014