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Kader B.KB

Kader B.

Lead Dev | Senior | https://studiokad.fr

€400/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Kader

Who am I?
My name is Kad, an independent full-stack developer passionate about web engineering and digital products. My DNA: building robust, scalable, and elegant solutions — and above all, useful ones. No fluff. We ship, we measure, we optimize.

Specialty
Backend first. Clean architecture, well-designed APIs, performance, security, and user experience at the core. When necessary, I switch to the front-end (React/TS), mobile (React Native), or DevOps (Docker / VPS / CI).

I design and evolve business platforms, SaaS, e-commerce, and technical applications with a product approach: speed of execution, user behavior, conversion, onboarding, monetization... everything is included.

Philosophy & Method
I combine pragmatism with a long-term vision. My approach:
• Clear & modular architecture (DDD / Hexagonal inspiration)
• Code quality & maintainability
• Simple & effective user experience
• Tests, logs, monitoring — the foundation for peaceful sleep
• Business focus: ROI, retention, scalability

In short, I build digital solutions that stand the test of time, even in a storm.
  • English

    Conversational

  • French

    Native or bilingual

Can work on-site
Paris (up to 50km)

Experience

  • studiokad
    Quizfire — real-time 1v1 quiz game (mobile + SaaS)
    SOFTWARE PUBLISHING
    March 2026 - Today (5 months)
    Paris, France
    Full-stack design and development of Quizfire, a real-time 1v1 quiz game published on the Play Store.

    • React Native / Expo mobile app (strict TypeScript): real-time gameplay, matchmaking, 6 leagues, weekly leaderboards, and game-feel animations.

    • Supabase Backend: PostgreSQL, Row Level Security, Edge Functions, and Realtime for game synchronization.

    • Next.js (App Router) SaaS Back-office: admin dashboards, monitoring, and player telemetry.

    • Monetization: AdMob (rewarded / interstitial) + in-app purchases (Play Billing).

    • State-driven architecture (Zustand + React Query), automated testing (Jest, pgTAP), quality CI.
    React Native Typescript Expo Supabase Next.js
  • studiokad
    Kingpar application sass/mobile for drivers who want to save time every day.
    PUBLIC SECTOR
    March 2026 - Today (5 months)
    Vibrant & community-driven parking app — all cities in France (24) free, intelligent guidance, on-device learning — Android + Web
    React Next.js Back-End Development API Visual Identity
  • studiokad
    AriaFix - Web accessibility audit.
    SOFTWARE PUBLISHING
    November 2025 - February 2026 (3 months)
    AriaFix automatically analyzes your sites to detect WCAG non-compliance, technical quality issues, and legal accessibility risks. Clear, actionable, transferable PDF report.
    Next.js Typescript Back-End Development User Interface Design Responsive design

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Certifications

  • PHP Symfony
    Symfony
    2016
    Unit testing Docker doctrine Symfony 4 Functional testing

Skill set

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