about me

passionate developer crafting digital experiences

My Story

I'm a Full-Stack & Mobile Developer specializing in building scalable, high-performance applications with modern technologies.

I work across the full development stack — from crafting pixel-perfect, responsive user interfaces using React, Next.js, Tailwind, and shadcn/ui, to building robust backend systems with Node.js and NestJS. I also develop mobile applications using React Native (Expo), focusing on smooth performance and intuitive user experiences.

My experience includes working with PostgreSQL, MongoDB, and MySQL, along with Prisma and TypeORM for efficient data modeling and scalability. I build RESTful APIs, implement secure authentication systems, and design clean, maintainable architectures.

I'm particularly passionate about building real-world products like SaaS platforms, mobile apps, and systems that solve actual problems — combining performance, usability, and clean code in every project.

+1

Years experience

+6

Completed projects

timeline

my journey

  1. Full Stack Developer (Mobile & Web)

    Buyootna · Remote

    Nov 2025Present

    Built a mobile-first real estate application using React Native (Expo), Next.js, NestJS, PostgreSQL, Prisma, TailwindCSS, and shadcn/ui. Implemented advanced filtering, map-based property discovery, and RTL-first UI for Arabic users. Focused on performance and user experience.

  2. Frontend / Full-Stack Developer

    BandAI · Remote

    Nov 2025Aug 2026

    Worked on building a modern UI-focused web application with clean design and smooth user experience. Developed reusable components and optimized performance using React and Tailwind CSS.

  3. Mobile Developer

    Rovin · freelancer

    Sep 2025Feb 2026

    Developed an AI-powered mobile travel app that helps users plan trips and explore destinations. Implemented real-time chat with AI for personalized travel recommendations, as well as group chat functionality where users can collaborate and discuss plans. Added the ability to mention @Rovin to directly ask the AI for suggestions and insights within conversations.

  4. Full-Stack Developer

    Cateflow (SaaS Product) · Remote

    Apr 2025Present

    Developed a full-stack SaaS platform for restaurant management with multi-tenant architecture. Built features for subscriptions, employee management, orders, and analytics dashboards. Designed scalable backend systems and modern UI using Next.js, Node.js, Prisma, and PostgreSQL.

  5. Bachelor of Computer Science

    Zagazig University – Faculty of Computers & Informatics · Zagazig, Egypt

    Oct 2024Present

    Studying core computer science subjects including data structures, algorithms, databases, and software engineering. Actively applying academic knowledge in real-world projects and SaaS product development.

  6. Self-Learning & Online Courses

    Online Platforms (YouTube, Docs, Courses) · Remote

    Nov 2022Present

    Continuous self-learning in modern web and mobile development technologies including React, Next.js, Node.js, Prisma, and React Native. Built multiple production-level projects to strengthen practical skills.

github

recent activity

constyoussef
@constyoussef

👋 Hi, I'm Youssef – CS student & frontend dev from Egypt. I love building interactive, responsive, and accessible web apps.

33 repos20 followers
constyoussef's GitHub contribution graph

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Youssef El Sayed

Building scalable, high-performance web and mobile applications with clean, efficient code.

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