Johannes (Jens) Eldering

Software Development since 2000 | info@jens.it.com | LinkedIn

Profile

Team Leader with over 20 years of experience founding, scaling, and leading high-performing technical teams. Skilled in delivering innovative, scalable solutions across multiple business units, including API architectures, AI integrations, and CMS platforms. A motivating leader with the ability to cultivate strong team bonds, inspire collaboration, and drive collective success. Passionate about starting new projects and building products from the ground up, fueling innovation and growth. Fluent in German, Dutch, and English.

Keywords

Programmer Leader Project Manager Innovator Product Builder Full-Stack Developer API Architect CMS Expert AI Integrator Team Lead System Architect Web Architect Mentor Agile Practitioner Cloud & DevOps Node.js React PHP Lua Python JavaScript Content Automation Scalable Web Solutions TypeScript

Professional Experience

Team Lead, Software Development CHECK24, Munich, Germany | 2014 – Present
Previously: Head of Function (2021–2025), Lead Developer (2017–2021), Senior Software Engineer (2016–2017), Professional (2014–2016)

• Pioneered the development of a custom Content Management System (CMS) for landing pages, now adopted across multiple CHECK24 verticals, significantly improving content scalability and deployment efficiency.
• Initiated the CMS project independently, scaled the team to four developers through strategic hiring and mentorship, and established a high-performing unit delivering innovative content solutions.
• Architected and implemented APIs enabling dynamic and personalized content delivery, boosting user engagement and enabling faster content rollouts.
• Spearheaded AI integration, leading the development of an AI-powered interface for Drupal, enhancing personalization and automating operational workflows.
• Directed project roadmaps and technical strategy, fostering cross-team collaboration and ensuring the delivery of high-impact, production-grade software on time.

Links:

https://www.check24.de

Founder / Software Development QRtag.net, Wassenaar, Netherlands | 2008 – Present

• Created and continue to operate a free QR code generation platform serving a global user base.
• Oversaw all aspects of the project, including software development, product strategy, marketing, and user support.

Links:

https://qrtag.net

Founder / Software Development Atec Media, Wassenaar, Netherlands | 2000 – 2013

• Designed and built custom web frameworks and corporate websites for clients including the European Space Agency (ESA), Miramap, and Decos.
• Led the development of ICT products, focusing on scalable web solutions and system integrations.

Researcher TNO, Leiden, Netherlands | 2012

• Developed a tool based on situated Cognitive Engineering for TNO, used to anticipate behavior in change management scenarios.

Links:

https://tno.nl

Technical Skills

• Languages: PHP, Python, Lua, TypeScript, Node.js, JavaScript (Vue, React), CSS/SCSS, HTML, Bash, SQL
• Frameworks & Tools: Node.js, Web Frameworks, API Design, AI APIs, Web Architecture, Kubernetes, Docker
• Development: Full-Stack Web Development, CMS, API Integration, System Optimization
• Leadership: Team Building, Mentoring, Project Management, Agile Methodologies

Currently specializing in:

AI usage, TypeScript, Java, Node.js, React, PHP, Lua

Languages

• German (Native)
• Dutch (Native)
• English (Fluent)

Projects & Off Topic

Development of "Egg Meister" for the Playdate 2024 - 2025

• Building a core library and an app in Lua for the Playdate Console.

Links:

https://play.date/games/egg-meister/

https://www.mrbot.de/egg-meister-my-first-finished-playdate-app

Hosting of a Fediverse Server 2023 - Present

• Hosting a small Fediverse server.
• Deployment of a Go App.
• Updating and maintenance of a VM (Virtual Machine).
• Creating an API for integrating OpenAI into the Fediverse for the creation of images and text.

Links:

https://mrbot.de/@dev

https://github.com/Scribilicious/fedibot

Development of various Alexa Apps 2020 - 2021 (discontinued)

• Created an Alexa API/framework in PHP for generating Alexa Apps on the fly.
• Released various apps in the Amazon Alexa Appstore.
• Received several prizes and awards from Amazon.

Education & Certifications

Leiden University of Applied Sciences (Hogeschool Leiden) 2010 - 2012
Bachelor's degree in Informatics, Innovation Management

Haagse Hogeschool/TH Rijswijk 1998 - 2008
Design and Visual Communications, General

References

Available upon request.