Looking for a job

Christian Karl

@christiankarl

Frontend developer at Formación Ninja and stensul; built a React Native exam-prep app and a Vue.js geospatial simulator.

Spain

Message

At Formación Ninja 🥷, I led frontend development of a React Native mobile app for Spanish civil service exam preparation, including practice tests, progress tracking, and onboarding flows.

At stensul, I participated in the Vue 2 to Vue 3 migration and implemented a design system across multiple application sections. I also led development of XSS exception features to reduce false positives and strengthen security.

I'm now building full-stack projects through Independent, including Middle-earth Wandering Simulator, which combines GIS data, interactive cartography, and live AI narration, and Hasen, a real-time multiplayer card game. I'm also pursuing a Master's in AI Automation & Agentic Engineering at EBIS/EUNEIZ.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer – Personal Projects & Upskilling

Current

Independent

Nov 2025 - Present (11 months)

- Middle-earth Wandering Simulator: geospatial project combining GIS data, interactive cartography and live AI narration with Vue.js 3. Live at middleearth.christiandelhey.com
- Hasen: real-time multiplayer card game (Vue.js 3, Socket.IO, Node.js, MongoDB). Live at hasen-game.onrender.com
- Master's in AI Automation & Agentic Engineering (EBIS/EUNEIZ) (on course).

Senior frontend developer

Formación Ninja 🥷

May 2025 - Oct 2025 (5 months)

- Led frontend development of a React Native mobile app for Spanish civil service exam preparation.
- Built UX-focused features: practice tests, progress tracking, and user onboarding flows.

Frontend developer

stensul

Jan 2020 - Mar 2025 (5 years 2 months)

- Participated in the migration from Vue2 (Options API) to Vue3 (Composition API), enhancing performance and maintainability.
- Implemented a new design system across multiple sections of the application, ensuring UI consistency and accessibility.
- Lead the development of features like XSS exception systems, reducing false positives and enhancing security protocols.
- Collaborated with QA, Produc

Frontend Developer

Ministerio de Producción y Trabajo de la Nación

Nov 2016 - Jan 2020 (3 years 2 months)

- Contributed to React projects aimed at supporting the growth of small industries in Argentina.
- Developed and maintained webpages using HTML, CSS, and jQuery, ensuring responsive and accessible designs.