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Alexandre Vargas LopezAV

Alexandre Vargas Lopez

Fullstack Developer Go / Next.js / React / Node

€550/day
Paris, FR
3-7 years

Average response time: A few days

Freelancer profile translated to English.
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About Alexandre

Hi, I'm Alexandre đź‘‹

I'm a fullstack developer in Nice, but I don't just do front-end. My specialty is handling the entire chain: React/Next on the interface side, Go back-end that handles the load, real-time with WebSockets, and the self-hosted infrastructure behind it. For 4 years, I've been building web and SaaS products from A to Z, from design to production.

My background is primarily entrepreneurial. I've founded several companies: Kops (SaaS B2B, in production), ReadyCook and Ontrace (two other SaaS I built), Devolab (web agency), and Upsky (trading). This taught me to think about the product in its entirety: infrastructure costs, production stability, user experience, everything that makes a project last.

I'm used to working on challenging projects: real-time feeds with millisecond precision, multi-tenancy, back-end performance under load, real-time API integrations. But I remain fullstack: a well-crafted React interface is also part of my daily work.

My stack:
• Front: React, Next.js, Vue/Nuxt, TypeScript, Tailwind
• Back: Node.js, NestJS, Go, REST & WebSocket
• Data: PostgreSQL, Redis, MySQL
• Infra: Docker, CI/CD, self-hosted servers, multi-tenant
• Mobile/Desktop: React Native, Capacitor, PWA, Electron

What I'm looking for: long-term missions (3 months and up) where I can be useful across the entire stack, whether on the front-end, back-end, or both. I'm available for in-person work anywhere in France, or remotely with occasional travel.

Do you have a product to launch, grow, or take over? Get in touch, let's talk.

Portfolio: alexvl.fr
GitHub: github.com/alexandre-vl
  • French

    Native or bilingual

  • English

    Fluent

  • Chinese

    Basic

Can work on-site
Paris (up to 50km), Paris (up to 50km), Lille (up to 50km), Nantes (up to 50km), Bordeaux (up to 50km)

Experience

  • Kops
    Founder & Lead Fullstack Developer
    SOFTWARE PUBLISHING
    March 2026 - July 2026 (4 months)
    Nice, France
    Co-founder of Kops, a B2B SaaS for Vinted resellers that I built from scratch.

    My role: everything. Product strategy, design, code (front + back + real-time), infrastructure, deployment, and operations.

    What's under the hood:
    • Real-time product feed with millisecond detection via WebSocket
    • Auto-cop (automated purchasing) with custom anti-bot stack (TLS fingerprinting, fHTTP)
    • Multi-tenant CRM with integrated messaging and sales stats
    • Go backend for performance, Next.js / React + Tailwind frontend
    • PostgreSQL + Redis for the data layer, K8S/ArgoCD for self-hosted deployment

    Stack: Next.js, React, TypeScript, Go, PostgreSQL, Redis, WebSocket, K8S
    Golang Next.js Kubernetes Redis PostgreSQL
  • Devolab
    Co-founder & Lead Developer
    SOFTWARE PUBLISHING
    January 2023 - July 2025 (2 years and 6 months)
    Bordeaux, France
    Co-founder of Devolab, a web agency based in Bordeaux. We assist companies end-to-end: design, custom website development, SEO optimization, hosting, and maintenance on self-managed servers.

    My role:
    • Technical lead on all client projects (architecture, stack choices, development)
    • Setup of self-hosted infrastructure (Docker, CI/CD, monitoring)
    • Front-end development with Vue 3 + Vite + Tailwind
    • Node.js backend and custom integrations
    • Technical SEO optimization (Core Web Vitals, schema.org, performance)

    Projects delivered for SMEs, agencies, and freelancers. We prioritize custom solutions over bloated CMSs, for fast, maintainable websites that truly belong to the client.

    Stack: Vue.js, Vite, Node.js, Docker, Nginx, PostgreSQL
    Node.js Docker Vue.js SEO PostgreSQL
  • ReadyCook
    Founder & Lead Fullstack Developer
    DIGITAL AND IT
    January 2024 - December 2024 (11 months)
    Nice, France
    Creator and sole developer of ReadyCook, the predecessor to Ontrace: an all-in-one CRM for Vinted resellers.

    Objective: replace the chaos of Excel + 12 tabs with a single tool that manages the entire sales cycle, from stock addition to package shipment.

    Features delivered:
    • Inventory and wardrobe management (stock organization + real-time tracking)
    • Strategic post scheduling with automatic reposting
    • Real-time order tracking with one-click shipping label download
    • Multi-account and multi-user management
    • Detailed financial reporting (turnover, margins, ROI per item)

    Project built solo, from design to production deployment. ReadyCook served as the foundation for evolving the concept into Ontrace.

    Stack: Next.js, React, Go, PostgreSQL, Redis
    PostgreSQL React.js Node.js Golang Redis

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Education

  • Fullstack developer training
    Self-taught
    • Front : React, Next.js, Vue/Nuxt, TypeScript, Tailwind • Back : Node.js, NestJS, Go, REST & WebSocket • Data : PostgreSQL, Redis, MySQL • Infra : K8S, Docker, CI/CD, serveurs self-hosted, multi-tenant • Mobile/Desktop : React Native, Capacitor, PWA, Electron

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