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Karim S.KS

Karim S.

Full-Stack Developer React / Next.js / TypeScript

€200/day
Oran, DZ
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Karim

Hello,

I am a Full-Stack Developer specializing in React, TypeScript, Next.js, and Python.

I assist startups, SMEs, and entrepreneurs in designing, developing, and improving high-performing, maintainable, and scalable web applications. My goal is simple: to transform your ideas into reliable, fast, and user-friendly products.

I can assist with:

• Custom web application development (React, Next.js, TypeScript)
• REST API creation and integration
• Back-end development with Python and Flask
• SaaS, business tools, and internal platforms
• Performance and user experience optimization
• Complex bug fixing and existing code refactoring
• Dockerization and deployment

Alongside my freelance work, I am pursuing a PhD in Computer Science, which allows me to bring strong technical rigor and expertise in advanced topics such as artificial intelligence, data processing, and algorithms.

I have already supported several international clients on various web projects, with a particular focus on code quality, communication, and meeting deadlines.

If you are looking for an autonomous developer who can quickly understand your needs and deliver a robust solution, I would be delighted to discuss your project with you.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Upwork (Remote)
    Freelance Full-Stack Developer
    January 2021 - Today (5 years and 5 months)
    • Top Rated • 100% Job Success • Clients across the UK, France, Switzerland, and Czech Republic, and more.
    • Delivered 20+ web application projects for 10+ international clients, maintaining a 100% job success rate and a 5.0 average rating.
    • Built and shipped production front ends with React, Next.js, and TypeScript, translating client requirements into responsive, maintainable interfaces.
    • Developed back-end services and REST APIs using Node.js, Express, and Python/Flask, integrating SQL and NoSQL databases.
    • Authored custom JavaScript plugins and resolved complex front-end issues that other developers were unable to solve.
    • Containerized applications with Docker and deployed to AWS, owning projects end to end from architecture to delivery.
    JavaScript Typescript Project Management Next.js Web Development
  • Brydg
    Intern Web Developer
    REAL ESTATE
    August 2020 - November 2020 (3 months)
    Londres, United Kingdom
    My responsibilities included utilizing Figma for design tasks, as well as coding in
    HTML, CSS, and JavaScript.
  • University of Djillali Liabes
    Part-Time Lecturer
    September 2023 - Today (2 years and 9 months)
    Sidi Bel Abbès, Algeria
    • Teach undergraduate computer science coursework, covering programming fundamentals and software development practices.
    Higher Education

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Education

  • PhD in Computer Science
    ESI-SBA
    PhD in Computer Science
  • M.Sc. in Computer Science
    University of Djillali Liabes
    2021
    M.Sc. in Computer Science

Skill set

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