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Steven DongSD

Steven Dong

Web & Fullstack Developer | React.Js, Node.Js

€397/day
13 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Steven

Fullstack & Mobile Developer | React.js · Next.js · React Native · Node.js


I design and develop web, mobile, and SaaS applications with AI integrations.
I assist startups, SMEs, and agencies from idea to final product — MVP delivered in 2 to 3 weeks.

🎯 What I offer


Web & SaaS Applications
Performant front-end (React, Next.js, TypeScript) + robust back-end (Node.js, NestJS, PostgreSQL)

Mobile Applications
React Native / Expo (iOS & Android), push notifications, stores

AI Integrations
Intelligent chatbots (OpenAI, Claude), content generation, conversational assistants

Showcase & Landing Pages
Pixel-perfect integration (Figma), technical SEO, responsive

🛠️ Stack & Tools


Frontend: React.js, Next.js, TypeScript, TailwindCSS, Shadcn/UI
Mobile: React Native, Expo
Backend: Node.js, NestJS, Prisma, PostgreSQL
AI: OpenAI API, Claude API, custom chatbots
Deployment: Vercel, Docker, GitHub Actions

📈 Recent Projects


→ MeritAI: AI revision SaaS platform — 22 pages, 38 API routes, delivered in 3 weeks
→ TierZeta: React Native mobile app for law voting + AI summaries — delivered in 2 weeks
→ Flatway: +500K monthly SEO impressions, Electron.js desktop CRM

✅ Why Me?


→ Comprehensive approach: development, product, design, and DevOps
→ Fluid and responsive communication
→ Clear, results-oriented methodology
→ Diverse projects: SaaS, mobile, AI, real estate, restaurant, insurance, education

📩 Have a project?

Let's discuss!
  • French

    Native or bilingual

  • English

    Fluent

  • Chinese

    Conversational

Can work on-site
Paris (up to 50km), Lille (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Toulouse (up to 50km)

Experience

  • Testisia
    Fullstack Developer (Next.js | NestJS | Stripe)
    January 2026 - February 2026 (1 month)
    As aFullstack Developeron Testisia, I designed and developed aSaaS platformenabling merchants to collect Google reviews through a "fortune wheel" gamification system, accessible via QR code.

    **The concept**: The merchant creates a campaign, configures prizes, and generates a QR code. The customer scans it, plays the wheel, wins a prize, and is then redirected to Google My Business to leave a review.



    **My Missions**:

    Merchant Area:
    • Full authentication, campaign management with prize configuration (name, image, quantity, probabilities), automatic QR code generation, and interface customization (logo, colors).
    • Real-time analytics dashboard: scans, games played, reviews collected, conversion rates, charts, and CSV export.

    Player Interface (Mobile-First):
    • Animated fortune wheel with probabilistic results and responsive design.
    • Multi-language (FR/EN/ES), merchant customization (colors, logo).
    • Post-game flow: GDPR form, automatic prize code sending, Google My Business redirection.

    Integrations:
    • Stripe Billing: subscriptions, auto-renewals, webhooks, invoices.
    • SMS/WhatsApp/Email campaigns via Twilio and Resend.
    • Unique, non-reusable prize codes with usage tracking.

    Admin Back-Office:
    • Global dashboard: MRR revenue, new sign-ups, merchant account management.


    **Security**: encrypted passwords, JWT, HTTPS, GDPR compliance.


    Technical Stack
    Next.js, NestJS, TypeScript, PostgreSQL, Prisma, TailwindCSS, Stripe, Twilio, Resend, Vercel

    **Key Results**:
    • Complete platform delivered in 3 weeks (auth, campaigns, wheel, dashboard, payments, marketing).
    • Smooth gamified flow from QR scan to Google review — maximizing conversion rate.
    • Fully automated subscription and billing system via Stripe.
    Next.js NestJs Stripe TypeScript Web Development
  • TIERZETA
    Mobile Developer (React Native | AI)
    PUBLIC SECTOR
    November 2025 - November 2025
    As aMobile Developeron TierZeta, I designed and developed a mobile application allowing citizens to vote on French laws and understand legislative texts through **artificial intelligence**.



    **The concept**: Make laws accessible to everyone through AI summaries and encourage citizen participation with an intuitive voting interface.



    **My missions**:

    Mobile Development:
    • Complete React Native application with a fluid voting interface and a feed of laws under review.
    • Clean and accessible design, smooth animations for voting interactions.
    • Sharing of results and real-time community results.

    AI Integration:
    • Automatic summaries of legislative texts via OpenAI API.
    • Simplification of legal language for the general public.
    • Conversational chatbot to explain the context and implications of each law.


    **Architecture**:
    • Performant REST API (NestJS, PostgreSQL, Prisma) for legislative data.
    • Cache system for optimal loading times.


    **Results**:
    • Functional application delivered in 2 weeks.
    • Complex legislative texts made accessible through AI summaries.
    • Engaging voting interface with immediate visual feedback.
    React Native artificial intelligence TypeScript Mobile Application NestJs
  • MERITAI
    Fullstack Developer (Next.js | AI)
    EDUCATION AND E-LEARNING
    November 2025 - December 2025 (1 month)
    As aFullstack Developeron MeritAI, I designed and developed an AI-powered revisionSaaS platformfor students.

    **The concept**: Automatically generate personalized educational content (text, audio, PDF, Word) via OpenAI and Claude, with a complete learning journey.



    **My missions**:

    Frontend Development:
    • Design of 22 pages with progress dashboard, training sessions, and fluid navigation (Next.js 14 App Router, TypeScript, TailwindCSS, Shadcn/UI).
    • Development of 31 custom React hooks for a maintainable architecture.

    Backend Development:
    • Architecture of 38 REST API routes with NestJS and Prisma (PostgreSQL).
    • Integration of OpenAI and Claude APIs for educational content generation.
    • 8 AI writing modules (rewriting, summarizing, explaining…).
    • Automatic generation of PDF and Word documents.

    Results:
    • Platform delivered at 87% in 3 weeks of development.
    • 22 pages, 38 API routes, 31 hooks — scalable architecture.
    • Fully automated multi-format generation by AI.
    Next.js NestJs TypeScript OpenAI artificial intelligence

Reviews

5.0

Out of 7 ratings

J

J.

CEO - Ellendir

Reviewed on 5/21/2026

Excellent work from Steven. I highly recommend this development artist.
J

J.

CEO - Ellendir

Reviewed on 4/14/2026

Excellent work from Steven. Serious and rigorous person on this project. Capable of handling very complex subjects!

Recommendations

Mehdi DjendarMD
Alexandru GherasieAG
Jimy XuJX
+5
Mehdi Djendar and 7 other people have recommended Steven

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Education

  • Software Engineering Expert
    Epitech
    Cursus BAC +5 - Pédagogie par projet - Gestion de projet & projets de groupe - Méthode agile & TDD - Langages: - C - C++ - Python - Docker - Javascript - Node js - TypeScript - React - React Native - Jenkins - Postgres - Git
  • Bachelor in Information Technology (Bac +3)
    Epitech
    2024
    Développement C - Développement C++ - Développement JS (React, Next, Node) et Typescript - Développement Python - Développement PHP

Certifications

  • Bachelor in Information Technology (Bac +3)
    Epitech
    2024
    C++ TypeScript Web Integration JavaScript HTML5 React Native Next.js React.js Python CSS3

Skill set

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