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Jack LevyJL

Jack Levy

Full Stack TypeScript · APIs · SaaS

€400/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jack

I build and scale reliable TypeScript backends for SaaS startups and web products — from API to production.

What I bring concretely:
→ Robust and scalable REST APIs (Node.js, NestJS, Express)
→ Optimized PostgreSQL databases (Prisma, Neon, Supabase)
→ Complete authentication (Google, Apple, JWT, roles and permissions)
→ Integrated Stripe payments
→ Deployment & CI/CD (AWS, Vercel)

Tech Lead at Kapstr (EventTech SaaS) since Oct. 2025 —
I designed the backend architecture of a multi-module event platform from scratch (real-time chat, notifications, payments, guest management).

Winner of Meta's AI Startup program (Fringuant, 2023).

I use Cursor daily, so I deliver faster, with fewer bugs.

✅ Available part-time (2-3 days/week)
✅ Remote worldwide
✅ Immediate start
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 30km)

Experience

  • Clofit
    Full Stack Dev
    September 2023 - February 2024 (5 months)
    Paris, France
    Built Clofit’s web app version based on an existing extension, enabling confident online shopping — dev independently.

    FashionTech.

    Full remote mode.
    React.js TypeScript Next.js Node.js Express Docker Axios TailwindCSS MongoDB Airtable Radix UI React Context Vercel Jest Swagger
  • Fringuant
    Full Stack Dev
    TECH
    August 2023 - February 2024 (6 months)
    Paris, France
    Data Provider Project

    Engineered a Data Provider web app. Facilitated AI’s size recommendations for the 2024 Paris Olympics by improving data accuracy, crucial for enhancing performance.

    Pioneered live cloud-based image update functionality, allowing users to revise uploads instantly, Significantly improving the data collection process efficiency and relevance by 25%.

    Designed and implemented a user interface that guides through measurements and image submission, ensuring and improving data accuracy and user consistency, pivotal for AI algorithms.

    Dashboard Admin Project

    Developed a comprehensive Admin Dashboard for Fringuant to manage partnerships and product listings. Integrated with Supabase for efficient data retrieval and manipulation.

    Enhanced operational efficiency by 41% through advanced filtering capabilities.

    Significantly reduced manual data entry by ~80% with bulk product additions via CSV uploads, automating the database update process.

    AI&FashionTech.

    Hybrid model. Based in Station F.
    Next.js React.js TypeScript Cloud AWS Supabase Linear Node.js Shadcn Axios PostgreSQL TailwindCSS Radix UI
  • EduSphere
    Frontend
    May 2023 - September 2023 (4 months)
    Paris, France
    Built a web platform to modernize the school system, including a responsive profile page for streamlined user data.

    EdTech.

    Full remote mode.
    React.js PHP Symfony JavaScript Axios

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