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Karim SemmoudKS

Karim Semmoud

Full-Stack Developer: Elixir, Phoenix & TypeScript

£151/day
Paris, FR
3-7 years

Average response time: 1 hour

About Karim

Book a 20-minute call to meet and discuss your needs, no commitment required.


I build web applications with Elixir and Phoenix at the core, focusing on clear backend architecture and real-time interfaces with Phoenix LiveView.

On the frontend I primarily work with TypeScript and Vanilla JavaScript, using Tailwind CSS and modern CSS for clean, maintainable styling, with PostgreSQL as the data layer.

My work emphasizes well-tested, well-documented, and efficient systems that teams can maintain and extend over time.

While this is my main stack, I can also adapt to existing environments and collaborate on projects using React, Ruby, or Ruby on Rails, helping improve or evolve an existing codebase without unnecessary rewrites.

Backend with Elixir

My main focus is the backend. Elixir runs on the Erlang VM, designed for highly concurrent and fault-tolerant systems. Using Phoenix, I build APIs, real-time services, and data-driven applications that handle large numbers of connections while remaining simple to maintain.

Frontend with Phoenix LiveView

Phoenix LiveView enables rich, interactive interfaces without the complexity of heavy JavaScript frameworks. This approach reduces moving parts while still delivering modern, responsive user experiences.

Accessibility

Accessibility is built in from the start. Applications follow WCAG standards with accessible UI patterns and consistent design tokens.

Testing, Documentation & Infrastructure

Projects include Playwright end-to-end tests, accessibility checks in CI, and clear documentation so teams can easily maintain and extend the system.

I also handle deployment with DNS and domain management, while remaining flexible with existing infrastructure and services.

Whether you are improving an existing Phoenix application, or need an experienced developer to join your team, I focus on delivering systems that teams can maintain

Available in English and French.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Netoum
    Full-Stack Developer (Elixir, Phoenix & TypeScript)
    TECH
    April 2025 - Today (1 year and 2 months)
    Paris, France
    Self-employed full-stack developer specialising in Elixir, Phoenix, TypeScript, React, and Tailwind CSS, with a deep passion for accessibility and design systems.
    I build tools that empower developers to create faster, more accessible web experiences, bridging the gap between ambitious ideas and production-ready code.


    Shipped multiple open-source projects used by developers globally, including:
    • Corex UI (30+ accessible vanilla JavaScript components with full WAI-ARIA support),
    • Themex JS (a flexible theming system)
    • Designex (design token tooling).
    • My Accessible Colors plugin for Framer helps designers meet WCAG standards effortlessly,making accessibility a core principle, not an afterthought.
    Every project I deliver is built for performance, consistency, and inclusivity, achieving near-perfect Lighthouse scores with zero layout shifts.

    Actively contribute to open-source tooling and the Framer community, while working with English and French-speaking clients worldwide to turn complex requirements into elegant, maintainable solutions.

    Whether you're a startup validating an MVP or an enterprise scaling a design system, I bring the technical depth and design sensibility to make it happen.
    Elixir Typescript Design Tokens
  • Meet Democracy
    Founder & Full Stack Developer
    PUBLIC SECTOR
    January 2023 - December 2024 (1 year and 11 months)
    France
    Founded Meet Democracy with a mission to strengthen the relationship between citizens and their governments. Currently developing an innovative civic technology platform designed to empower individuals to take a more active role in the democratic process, fostering greater engagement and collaboration between communities and public institutions. Driving the company from concept through to product development, with a vision to create more transparent, inclusive, and responsive public policy.
  • Affnet Limited
    Affiliate & Digital Marketing
    DIGITAL AND IT
    January 2017 - April 2023 (6 years and 3 months)
    Saint Julian's, Malta
    Independently operated a full-time digital marketing business within the online casino affiliate industry. Built and managed affiliate websites, producing SEO-optimised content and in-depth casino reviews to drive organic traffic and player referrals. Developed and maintained casino comparison platforms, leveraging search strategies and paid advertising campaigns across PPC and social media channels to maximise reach and conversions. Managed all aspects of the business independently, from content strategy and campaign management to performance analytics and affiliate partner relationships.

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Education

  • Université Paris 7

Skill set

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