Freelancer profile translated to English.
Back to original languageAbout Flavien
Expert React, Next, JavaScript | Architecture, Audit, Performance 🚀
14 years of experience.**Principal Engineer & Front-End Architect.** Unlike a traditional developer, I don't just "code features," but rather **industrialize your technical success**.
Specializing inhigh-trafficenvironments (Scale-ups & Large Accounts), I transform critical architectures into performant, stable, and maintainable products.
🏆 MY MEASURED IMPACTS:
- 👉Web performance boosted (LCP reduced from 2.8s to 1.2s, i.e., -57%)
- 👉 Direct increase in conversion **(+5%)**.
- 👉 Standardization of coding practices for dozens of developers and management of massive load peaks.
- 👉 Reduction of 40% in production instances.
Be Keeper (GreenTech IoT):CTO & Lead Developer.
- 👉 Result: Design "**From 0 to 1**" of a hybrid IoT platform (B2B/B2C). Creation of real-time hive health analysis algorithms.
⚙️ MY TECHNICAL EXPERTISE
🎯 WHY CONTACT ME?
Do you have an ambitious project, technical debt slowing down your business, or need an uncompromising performance audit?
I combine technical excellence with pragmatism to turn your challenges into operational successes.
đź“žImmediately available for short assignments (Audit, Architecture, Scoping) or expert support.Response within 2 hours.
English
Native or bilingual
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- VeepeeSenior Platform Engineer & Chapter LeadE-COMMERCEAugust 2024 - January 2026 (1 year and 5 months)Lyon, FranceContext:Leader in event e-commerce (4M users). Complex matrix environment.Missions & Impacts:*Platform Engineering:Transforming Front-End Engineering into a unified industrial platform. Managing a Flagship Nx Monorepo (110+ packages) and implementing Module Federation.*Infrastructure & FinOps:Driving a migration that enabled a 40% reduction in production instances.*AI Innovation (DevEx):Implementing MCP (Model Context Protocol) servers to connect LLMs (Claude/Cursor) to production tools (e.g., generating components from Figma).*Leadership:Technical referent for 18 developers (Chapter Lead). Standardizing practices (ESLint, Renovate).
- ChaskisSenior Developer LeadRESTAURANTS AND FOOD SERVICENovember 2023 - August 2024 (9 months)Genève, SwitzerlandContext:Exclusive logistics partner for Uber. Critical stack modernization.Missions & Impacts:*Mobile Redesign:Native rewrite of the courier application in React Native (migration from Xamarin).*Web Modernization:Migration of the operational Back-office to Next.js and .NET 7 to ensure real-time performance.*Design Systems:Creation of two distinct Design Systems ("Web Ops" for data density vs "Mobile Field" for on-the-go use).
- RUBIXPrincipal Frontend EngineerE-COMMERCENovember 2019 - November 2023 (4 years)Lyon, FranceContext:European leader (Revenue €3B). Unified platform for 8 sites and 10 countries.Missions & Impacts:*Headless Migration:Design of the strategic migration from legacy SAP Commerce to a decoupled Next.js/React architecture.*Record Performance:Reduction of LCP from 2.8s to 1.2s (-57%), generating a direct increase of +5% in conversion rate.*Architecture:"Domain-based" design and integration of Hexagonal Architecture principles.*Team Building:Creation of the Front-End department from scratch (0 to 12 engineers) and management of distributed teams (Tunisia, Morocco, Netherlands).
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Education
- Professional Bachelor's Degree in Embedded Mobile ComputingIUT Lyon 12014DĂ©veloppement d'applications mobiles sous : * Android (Java) * iOs (Objective-C) * Windows (c#)
- University Diploma in Technology in Computer ScienceIUT Lyon 12012DĂ©veloppement informatique Acquis : * Java * C/C++ * HTML/CSS/PHP * Windows * Linux