Description

Ich bin Jörn, Senior Full Stack Engineer mit Fokus auf performante Web- und Mobile-Applikationen mit React, React Native und Node.js. Ich arbeite lösungsorientiert, effizient und lege Wert auf sauberen Code, Skalierbarkeit und pragmatische Umsetzung.

Ich unterstütze Unternehmen von der Idee bis zum Release – inklusive Architektur, Entwicklung, Testing und CI/CD-Automatisierung. Aktuell suche ich spannende Projekte, bei denen Qualität und Geschwindigkeit zählen.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent
French
Basic

Workplace preferences

Can work on-site

Halle (Saale) (up to 50km)

Lulububu Software GmbH
Senior Fullstack Engineer
DIGITAL AND IT
January 2021 - February 2026 (5 years and 1 month)
Led end-to-end project delivery for 15+ React Native apps and 30+ React frontends, ensuring on-time, high-quality releases Owned client relationships and roadmap prioritization, balancing business goals with technical feasibility Designed and developed scalable, high-performance applications using React, React Native, Symfony, and Node.js Introduced CI/CD pipelines and QA processes that improved release stability by 25% Mentored and coordinated a cross-functional team of developers
App Entwicklung Webentwicklung Projektmanagement React.js React Native
Self Employed - Freelancer
Senior Fullstack Engineer
December 2016 - Today (9 years and 7 months)
Delivered web and mobile applications with strong focus on scalability and user experience Engineered automation systems and internal tools, improving client operational efficiency by up to 30% Consulted startups and SMEs on architecture design and technology strategy across React, PHP, and Node.js ecosystems Built long-term client relationships through technical leadership and transparent project management
Webentwicklung App Entwicklung React.js React Native Next.js
Cytooxien
Java Software Engineer
January 2014 - May 2017 (3 years and 4 months)
Designed and implemented Java-based server plugins used by over 2 million players Developed performance-optimized minigames, increasing user retention by 20% Built custom management tools for server monitoring, backups, and moderation – improving uptime and administrative efficiency
Java