Freelancer profile translated to English.
Back to original languageAbout Tanguy
Senior front-end developer React / Next.js and web consultant, I work on web products where the front-end goes beyond the interface: critical paths, API integration, tracking, SEO, performance, business data, and delivery quality.
I can get involved in:
• Hands-on React / Next.js development;
• Targeted refactoring of existing front-ends without complete rewriting;
• Reliability of critical paths: forms, funnels, customer areas, dashboards;
• API integration and structuring front-end / back-end communication;
• Clean and maintainable tracking / analytics;
• Performance improvement, technical SEO, and production stability;
• Clarification of complex business rules with front-end, API, or SQL impact.
My approach is pragmatic: understand the existing system, deliver quickly, secure what could break the product, and avoid unnecessary large architectural projects.
I have worked on high-traffic or high-business-constraint React / Next.js environments: progressive migration, customization, tracking, offline-first PWA, regulated paths, security, data, and large-scale deployments.
French
Native or bilingual
English
Fluent
Korean
Basic
Can work on-site
Gif-sur-Yvette (up to 50km)
Experience
- BOATCLARITYFull-Stack Developer — Independent ProjectSOFTWARE PUBLISHINGAugust 2025 - Today (1 year)Gif-sur-Yvette, FranceIndependent project for the design and development of a business web product for sailboat sellers and transaction professionals, particularly brokers.• Modeling of a complex business domain: reports, technical sections, engines, expenses, invoices, quotes, and publication statuses.• Design of the PostgreSQL schema, migrations, and integrity rules ensuring data consistency.• Development of an editing and publication workflow: structured input, autosave, preview, and management of draft/published states.• Implementation of secure APIs, scoped user access, and distinct projections between the private editor and the public report.• Continuous deployment on Vercel and product iterations leading to a functional seller workflow.
- FDJFront-End Developer / Technical Lead for the web lottery squadENTERTAINMENT AND LEISUREDecember 2021 - January 2025 (3 years and 1 month)92100 Boulogne-Billancourt, France
Context & Challenge:
Progressive migration of fdj.fr (Symfony → Next.js) in a critical environment:- Very high traffic with extreme peaks (draws, jackpots)
- SEO maintenance during a page-by-page migration
- Reliability of incomplete and heterogeneous tracking
- Preparation for advanced personalization (different experiences based on user profile)
- Fragmented legacy code & business logic duplication
- Risk of performance and SEO regression
Key Interventions:
- Reverse engineering of fragmented business rules, restructuring without regression
- Generic page architecture: adapting content based on user profile (Client A/B/prospect) without logic duplication
- Design and implementation of the unified tracking library: eliminating the "tracking per feature" burden
Impact:
90% reduction in feature-to-tracking time, significant increase in gaming data coverage, first batch of personalized clients delivered, notable improvement in Web Vitals (especially on mobile/slow networks), no SEO regression. - AccorLead Front-End / Workspace PlatformHOSPITALITYDecember 2018 - October 2021 (2 years and 10 months)Issy-les-Moulineaux, France
Context & Challenge:
Workspace Platform (React SPA + .NET Core API) for over 100,000 Accor employees. Transition from MVP to global deployment under strict technical and security constraints.- Deployment on shared workstations (hotels), unstable network environment, frequent sessions → strong requirements on performance and session management
- Stabilization of a critical data layer (integrity issues via stored procedures)
- Strict security audit before worldwide deployment (exposed APIs)
- Fine-grained management of access rights and KPIs in coordination with BI teams
- Integration of an AXA health application into the Accor ecosystem (compliance + global deployment)
Key Interventions:
- Leading the React front-end architecture with a focus on performance (optimized latency on constrained workstations)
- Reliability of the SQL layer — correcting data integrity issues
- Securing the back-end and front-end in collaboration with the security team (audit and remediation)
- Coordination with BI for KPI structuring and profile-based rights management
- Migration of the AXA health web app (medical assistance for hoteliers): adapting patterns for Accor compatibility, worldwide deployment
Impact:
Platform scaled to over 100,000 employees, security audit validated, reduction in data incidents, worldwide deployment without major incident.
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Education
- Professional Certificate in Web ProgrammingConservatoire National des Arts & Métiers2010Professional Certificate in Web Programming
- BTSJULES FERRY1998ELECTRONIQUE
Certifications
- Oracle Database SQL Certified Associate 1ZO-071ORACLE
- Oracle APEX Cloud Developer Certified ProfessionalORACLE