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YK Développement

About

Yannis Koula

Available for new projects

Independent full-stack developer. I design and ship web and mobile products end to end — from the first conversation to production, with the craft of a senior engineer.

05 projects 03 platforms 68 technologies

Portrait of Yannis Koula

Founder — YK Développement

My background

I build products, not prototypes. A full-stack and mobile developer, I take applications end to end: the architecture, the back-end, the interface, the AI, the deployment — the whole chain, with no layer outsourced.

Complexity is my home ground: a mobile app with twelve modules talking to each other, a business SaaS with its rules, payments and GDPR compliance, an autonomous system that runs on its own with no room for error. When a project has many moving parts, that is where I am most useful.

See the work

  1. Education

    BTS Informatique et Gestion des Réseaux

    École Vidal

  2. Education

    Développeur Full-Stack

    Le Wagon

  3. Today

    YK Développement

    Independent practice: I design, build and ship every product end to end.

    Alpha and Morpheus are private: I share their stack and engineering challenges, never the business logic.

How I work

A good product shows in the details: a smooth transition, a clear error message, a page that loads fast. I code like a craftsman — typed, tested, with no hidden debt.

I communicate by default: regular check-ins, a demo at every iteration, and plain language, never jargon.

What guides me

  1. Uncompromising quality

    Every detail counts: accessibility, performance and pixel care.

  2. Simplicity

    The simplest solution that works, never over-engineering.

  3. Transparency

    Clear quotes, regular updates, no surprises.

  4. Ownership

    I take the problem end to end, from scoping to maintenance.

Mapping 68 technologies 05 projects

The technologies I master

Every node is a technology; its size follows the number of portfolio projects that actually use it, and its colour groups it by family. Hover or navigate with the keyboard to see where each one served.

  • Languages

    The common bedrock: the languages everything else is written in.

    • TypeScript· 3
    • JavaScript
    • Python· 2
    • Ruby· 1
    • Rust· 2
    • SQL· 4

  • Web frontend

    Web interfaces — rendering, state and accessibility, down to the detail.

    • React· 3
    • Next.js
    • Vite· 2
    • Tailwind CSS· 3
    • shadcn/ui· 1
    • TanStack Query· 3
    • Zustand· 3
    • React Hook Form· 1
    • Zod· 1
    • Recharts· 1
    • Framer Motion
    • i18next· 1

  • Mobile

    Native iOS and Android apps, built offline-first.

    • React Native· 1
    • Expo· 1
    • React Navigation· 1
    • Reanimated· 1
    • FlashList· 1
    • MMKV· 1
    • HealthKit· 1
    • Health Connect· 1
    • Firebase· 1

  • Back-end

    The APIs, data and real-time that power the products.

    • Node.js· 1
    • Express· 1
    • FastAPI· 1
    • Ruby on Rails· 1
    • Prisma· 1
    • PostgreSQL· 3
    • PostGIS· 1
    • pgvector· 1
    • Redis· 1
    • Action Cable· 1
    • Alembic· 1
    • Resend· 1
    • Cloudinary· 1
    • Web3.py· 1

  • Auth & payments

    Identity, sessions and payments — trust on the server side.

    • JWT· 2
    • OAuth· 2
    • Passport· 1
    • Devise· 1
    • bcrypt· 1
    • Stripe· 2

  • AI

    Models, embeddings and agent orchestration, from prompt to production.

    • OpenAI· 1
    • Embeddings· 1
    • RAG
    • MCP
    • MLX· 1
    • Multi-agent orchestration· 1

  • Desktop

    Native desktop apps, close to the system.

    • Tauri 2· 2
    • Rust· 2
    • Native IPC· 1

  • Infra, quality & DevOps

    Tooling, tests and infrastructure that hold the quality bar.

    • ESLint· 1
    • Prettier· 1
    • Vitest· 2
    • Playwright· 2
    • pytest· 1
    • Docker· 2
    • GitHub Actions· 1
    • Vercel
    • Hetzner
    • Cloudflare
    • Tailscale
    • Prometheus/Grafana
    • Sentry· 1

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About — YK Développement