Karim Hossenbux

Software Engineer / Product Developer

karimhossenbux@gmail.com

Full-stack Developer with a strong focus on the frontend.

Detail-oriented, I have a passion for crafting user-friendly interfaces.

Dedicated on delivering clean, efficient, and maintainable solutions.

Based in Barcelona, Spain

Skills

Frontend

TypeScriptJavaScriptReactRSCNext.jsReact NativeTailwindSCSSNuxt.jsVuexVueElectronCSS/SVG AnimationUI/UXp5.jsJestCypress

Backend

ServerlessArchitect ServerlessAWSTerraformLambdaS3CloudFrontCloudWatchEC2Headless CMS (Storyblok)AI/MLOpenAI APIDeepgram APIPrismaPostgreSQLMySQLNodePHPLaravelRESTful

Extra

ShopifySwiftPythonFigmaSketchJIRA

Experiences

Senior Software Engineer@ EF Education First
2018/03Present

Led performance and reliability efforts, including server-side rendering, image optimization, and build time reduction by 100%, resulting in fewer production incidents year-over-year.

Owned and evolved the EF Go Blog, a global content platform supporting 50+ languages and 2M+ monthly visits. Migrated from WordPress multisite (EC2 + load balancers) to a modern Next.js + Storyblok stack, improving performance by ~80% and Core Web Vitals scores.

Implemented and maintained cloud infrastructure using AWS (Lambda, S3, CloudWatch, CloudFront, build pipelines) using Terraform, ensuring high availability and scalability for all APIs and applications.

Co-developed a React + Tailwind CSS design system used across EF platforms for consistent branding and faster delivery.

Designed and shipped a localization tool integrated with Storyblok’s API, streamlining translation management across dozens of languages.

Built an AI agent leveraging Storyblok’s component schema to generate landing page designs and content, enabling editors to create pages faster without developer assistance.

Mentored junior developers through code reviews, pair programming, and architecture discussions, contributing to team growth and code quality.

Senior Software Engineer@ Meetingassistant.co
2025/05Present

Built an AI-powered meeting tool that transcribes and generates action items from voice recordings using OpenAI and Deepgram APIs

Integrated seamless voice automated transcription pipelines, and chat-based hints UX for users to interact with their meeting notes

2018/01Present

Built a cross-platform cryptocurrency portfolio tracker (macOS, Windows, Linux), with an active roadmap expanding to iOS/Android via React Native

Full product lifecycle lead: architecture, frontend/backend code, UI/UX design, licensing, and user support

Full-Stack Developer@ Game Publishing / Exoty
2010/082017/12

Designed and launched 100+ custom gambling websites for desktop and mobile.

Built a custom CMS and reusable theming system, cutting launch time by 100%.

Integrated payment gateways, real-time multiplayer, and live chat for social games.

Implemented monitoring systems to detect broken pages, expired domains, and dropped rankings to maintain SEO.

Web Developer@ Maria Barcelona
2010/012010/07

Developed responsive marketing sites for clients like Liceu Theatre, Knorr, and Moventis working closely with designers and PMs in an agency setting.

Web Developer@ Cmedia
2008/032009/12

Maintained and scaled a network of 1,200+ gambling sites using WordPress and Drupal, automating content updates with cron jobs and ad systems.

Educations

English degree@ Université de Saint-Denis
20062008
Application development & systems integration@ Lycée de Bellepierre
20042006
Baccalauréat in sciences and technologies@ Lycée Antoine Roussin
20022004

Languages

🇫🇷
French[Native]
🇺🇸
English[Fluent]
🇪🇸
Spanish[Fluent]
🇷🇪
French Créole[Native]

Interests

Music, running, walking, anime, my dog, video game, longboard, side projects (design and development)