Freelancer profile translated to English.
Back to original languageAbout Steeven
Next.js / React Full-Stack Developer — High-performance SaaS & Apps
You have an idea, a Figma mockup, or a slow application hindering your growth?
I help startups, SMEs, and entrepreneurs create or improve fast, scalable, and conversion-oriented digital products.
What I bring to you
- Transformation of an idea into a functional SaaS
- Performance optimization (Core Web Vitals)
- UX designed to convert and retain your users
- Clean and scalable architecture
Concrete results
→ up to -40% loading time
→ +35% UI responsiveness
→ improved conversion on key pages
Expertise
- Next.js, React, TypeScript
- Node.js, REST API, Prisma
- Supabase, Auth, user management
- TailwindCSS, shadcn/ui
Specialties
- SaaS & MVP
- Marketplace / web platforms
- Dashboards & business tools
- Refactoring and optimization of existing projects
Projects
- JobPortal: HR SaaS with real-time application tracking
- Data Dashboard: Marketing & financial piloting
- Mobile classifieds app (marketplace type)
My method
1. Understanding your business objective
2. Clear roadmap (budget, deadlines, priorities)
3. Agile development with regular feedback
4. Delivery + complete autonomy
Why me?
- Results-oriented approach (not just code)
- Clear and fast communication
- Maintainable and scalable code
- Available immediately
- Response within 1 hour
- First free consultation to scope your project
French
Native or bilingual
English
Conversational
Lingala
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- Genius CareerFull-Stack React.JS / Next.JS DeveloperCONSULTING AND AUDITSDecember 2024 - May 2025 (5 months)Paris, France🎯 The companyGenius Career is a consulting firm specializing in executive search, selection, and placement. The company operates a digital platform for matching and career coaching.The technical challenge was to support an online placement agency business requiring high-level performance for candidate processing and a smooth user experience for recruiters and talents.🎯 My responsibilities
- Frontend performance optimization (Core Web Vitals)
- Transformation of Figma mockups into reusable components
- Implementation of server-side pagination for managing large data volumes
- Asynchronous management of client-server communication
- Structuring pages and routing in Next.js
🎯 Organization and methodologyWork in short cycles with regular validation and UX adjustments based on user feedback. Full autonomy on technical aspects related to performance and interface.🏆 Impact and results- Reduction of40% in Largest Contentful Paint (LCP)
- Improvement of35% in Time To Interactive (TTI)
- Acceleration of30% in application response times
- Increase of25% in integration speedthanks to reusable components
These improvements have streamlined the user experience and made the platform more usable for end-users. - SOSEP GroupFront-End DeveloperE-COMMERCEOctober 2022 - February 2023 (4 months)Paris, France🎯 The companySOSEP Group is an organization specializing in the development of digital solutions and application services.Projects involved the creation of web interfaces connected to secure backend services and handling business data.🎯 My responsibilitiesAs a Front-End Developer, I was responsible for integrating user interfaces and connecting with backend services:
- Pixel-perfect integration of Figma mockups
- Development of responsive and adaptive pages (desktop, tablet, mobile)
- Connection to secure REST APIs provided by the backend team
- Management of application states and dynamic data display
- Structuring components to improve code maintainability
🎯 Organization and collaborationI worked in direct coordination with backend developers to ensure the smooth flow of data between the interface and API services.Developments were version-controlled using Git with continuous feature validation to ensure the stability of production releases.🏆 Results and contributions- Stable and production-ready interfaces
- Reliability of front-end / backend communication
- Visual consistency respecting mockups
- Reusable component base facilitating future evolution
- L2R Office ServicesWeb Integrator / WordPressCONSULTING AND AUDITSSeptember 2021 - December 2021 (3 months)Paris, France🎯 The companyL2R Office Services assists companies in creating showcase websites and enhancing their online presence, with a focus on user experience and natural referencing.🎯 My responsibilitiesAs a web integrator, I was responsible for creating and optimizing showcase websites for clients:
- Integration of WordPress sites from custom designs
- Theme customization to meet specific client needs
- Optimization of SEO performance and loading times
- Monitoring web integration best practices
- Creation of reusable components to accelerate the deployment of new sites
🎯 Organization and methodologyCollaboration with designers and project managers.Each site was delivered to production after validation, with responsive compatibility testing and adherence to performance standards.🏆 Results and contributions- Deployment of stable showcase websites faithful to mockups
- Improvement of SEO performance
- Implementation of modular practices for future projects
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Education
- FullStack Big Data Developer (M2)L'Ecole Multimédia2025Projet : Application Next.js + Prisma + ElasticSearch + PostgreSQL (auth JWT, ISR) – déployée sur Vercel. Modules clés : Architecture web, DevOps (CI/CD), Data & Cloud, Performance Web, Data pipelines.
- Master 1 (M1), Multimedia DeveloperL'École Multimédia2023Projet : site vitrine responsive avec CMS headless (Next.js) Modules clés : Intégration web, UX/UI, Accessibilité, SEO
Certifications
- Full Stack BIG DATA DeveloperCEGEFOS2025
- Multimedia DeveloperEcad Consultants2023