Freelancer profile translated to English.
Back to original languageAbout Guillaume
Looking to bring your mobile/web app project to life or improve an existing product?
You're in the right place! Here are my areas of expertise:
- ⚡️ Creation of professionalmobile&webapplications, software architectures, from front-end to back-end
- 👨💻Design and developmentof existing features (Nest.js, Laravel, Node.js, Django, Flutter, VueJS/NuxtJS)
- 🚀Optimizationof existing features(Flutter, NodeJS, NestJS, Laravel)
- 📱Support**, **design**, **development**, and **deploymentof iOS & Android mobile applications, along with their associated API if necessary.
- Writingtests (unit, integration)for feature development **(Flutter & back-end)**.
We start from your app idea, simplify it as much as possible to establish a Minimum Viable Product (MVP), and I'll develop it for you with full transparency on project progress.
🔍 A concrete client case?
KEYMis an application that aimed to address the music industry's lack of a tool to find providers/clients and publish content like Instagram.
My work:
-Project simplification**, **definition of core featuresfor a usable version
-Clarification of complex functionalitiesbefore development
-Support for client product decisionson interface presentation
-Recruitment of a second developertoacceleratethe project due to client deadlines
- And finally,project developmentwith complete transparency on its progress
Result: an application delivered **in 3 months**, **functional**, and **ready to use**.
Shall we discuss your project in private messages?
French
Native or bilingual
English
Fluent
Can work on-site
Lyon (up to 50km), Paris (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Nice (up to 50km)
Experience
- BetclicAdvanced software engineerJanuary 2026 - Today (7 months)Assisted in the development of a Flutter application, following clean architecture principles and dividing features into package layers.
- MiddleCTOSOCIAL NETWORKSJuly 2023 - December 2025 (2 years and 5 months)Lyon, FranceDevelopment, maintenance, and deployment of a dating application (Backend & Mobile)- Design of the entire database architecture- Back-end architecture design- Development of the entire application in Flutter (Riverpod for state management, auto_route for in-app navigation)- Implementation of a CI/CD for automated deployment with Fastlane & Github Actions- Setup of push notifications via Firebase- Development of unit & integration tests using Jest- Implementation of in-app purchases- Automated back-end redeployment via CI/CD
- HelloCSELead dev & IT ManagerE-COMMERCESeptember 2021 - September 2024 (3 years and 1 month)Lyon, FranceResponsible for the development/maintenance/addition of new features for 2 mobile applications and their respective back-ends. Provided recommendations for improvements and their technical/applicative arrangement.Implemented CI/CD for the applications, defined the architecture, and established unit and integration tests.Development of the HelloCSE mobile application.Google PlayStore: https://play.google.com/store/apps/details?id=com.sylarele.helloce&hl=fr&gl=USAppStore: https://apps.apple.com/fr/app/hellocse/id1444579400
Reviews
Recommendations
MB
FU
+1
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Education
- Web Designer, Web DevelopmentCESI Alternance2018Concepteur Web, Développement Web
- Bachelor's Degree in Information-Communication, Digital CommunicationUniversité de Toulon2017Licence 3 Information-Communication, Communication digitale