Hi, I’m Thomas Karlsson, a WordPress expert and full‑stack web developer based in Tyresö, Sweden. I spend hours coding, hacking, testing, and optimizing for different needs. I’m proficient in common web programming languages and, in my spare time, I enjoy building projects in JavaScript frameworks such as Next.js and Remix. I also love sharing knowledge and teaching courses in WordPress, web development, and related technologies. When I’m not hands‑on with code, I mentor colleagues, lead technical initiatives, and help teams design robust architectures. I’m passionate about delivering scalable solutions, empowering others, and continuously learning new tools to improve performance, accessibility, and user experience.…

Thomas Karlsson

Hi, I’m Thomas Karlsson, a WordPress expert and full‑stack web developer based in Tyresö, Sweden. I spend hours coding, hacking, testing, and optimizing for different needs. I’m proficient in common web programming languages and, in my spare time, I enjoy building projects in JavaScript frameworks such as Next.js and Remix. I also love sharing knowledge and teaching courses in WordPress, web development, and related technologies. When I’m not hands‑on with code, I mentor colleagues, lead technical initiatives, and help teams design robust architectures. I’m passionate about delivering scalable solutions, empowering others, and continuously learning new tools to improve performance, accessibility, and user experience.…

Available to hire

Hi, I’m Thomas Karlsson, a WordPress expert and full‑stack web developer based in Tyresö, Sweden. I spend hours coding, hacking, testing, and optimizing for different needs. I’m proficient in common web programming languages and, in my spare time, I enjoy building projects in JavaScript frameworks such as Next.js and Remix. I also love sharing knowledge and teaching courses in WordPress, web development, and related technologies.

When I’m not hands‑on with code, I mentor colleagues, lead technical initiatives, and help teams design robust architectures. I’m passionate about delivering scalable solutions, empowering others, and continuously learning new tools to improve performance, accessibility, and user experience.

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Skills

Experience Level

CSS
Expert
HTML5
Expert
JavaScript
Expert
PHP
Expert
React JS
Expert
WordPress
Expert
MySQL
Expert
PostgreSQL
Expert
SQLite
Expert
Node.js
Expert
TypeScript
Expert
GitHub CoPilot
Intermediate
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Work Experience

Remote Teacher (Web Programming) at Media Institute
September 1, 2025 - September 26, 2025
Teach various subjects and help schools create school-programs throughout the year.
Head of Research & Development at Catena Media
January 1, 2025 - September 26, 2025
R&D focused on researching and testing AI solutions for internal use.
Technical Lead / Architect at Catena Media
August 1, 2023 - September 26, 2025
Managed the technology team and built key products such as an ad-system to manage CTAs, user access/roles, and cache clearing, connecting to and updating all websites.
Full-stack Developer / Co-owner at FleXeats AB
February 1, 2023 - September 26, 2025
Startup that needed a real-time ordering website/app.
Teacher (Web Programming) at Media Institute
September 1, 2025 - September 26, 2025
Remote instructor delivering courses in web programming across various subjects; designed curricula and supported schools in creating year-round programs.
Technical Lead / Architect at Catena Media
August 1, 2023 - September 26, 2025
Led the engineering team and built key products, including an ad system to manage CTAs, user access/roles, and cache clearing to connect and update multiple websites.
Full-stack Developer / Co-owner at Flexeats AB
February 1, 2023 - September 26, 2025
Co-founded a startup and delivered a real-time ordering website/app; led full-stack development and collaborated with partners to bring the product to market.

Education

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Qualifications

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Industry Experience

Software & Internet, Media & Entertainment, Education, Professional Services, Other, Gaming, Computers & Electronics
    paper Catena Media

    In my nearly six years at Catena Media, I grew from an Architect building key internal systems to the Head of Research & Development. During that time, I managed the North American tech team and led projects that streamlined operations across all company websites, which gave me extensive experience in maintaining complex web environments.

    paper BetUpmedia

    Managed their entire tech stack, built requested features, helped with design, speed/CWV, and SEO.