Writings
Blog
Sonderzeichen in Vim
15.02.24Probleme bei der Verarbeitung von Sonderzeichen unter VIM
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Gitlab Virtualbox Runner
02.02.24Völliger automatisiertes einrichten eines Ubuntu Maschine als Gitlab VM Runner
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About Me
Know Me More
I'm René Gerritsen,a Developer
I specialize in crafting dynamic and innovative software solutions that fuel business growth and productivity. With an extensive portfolio encompassing PHP, JavaScript, and Go programming languages, I'm well-versed in various platforms including Symfony, Shopware, and Magento. My hands-on experience in the online travel industry has fostered a deep understanding of its unique needs, enabling me to devise tailored tech strategies that cater to this specific market.
Offering a comprehensive range of services from custom plugin development to API construction, I employ best practices to create highly reliable, scalable, and efficient software solutions. With my proficiency in refactoring legacy code, I can modernize your existing applications to align with the latest technology standards, thereby ensuring optimal performance and increased business agility.
Moreover, I pride myself on my ability to implement robust CI/CD pipelines. This paves the way for consistent, faster, and more reliable software releases, enhancing your team's productivity while reducing the time-to-market for your software products.
My mission is not only to meet your immediate software needs but also to lay a robust foundation for future growth and adaptability. My meticulous and client-centric approach has allowed me to deliver top-tier results within time and budget constraints. I look forward to helping your business leverage the power of technology to achieve unprecedented success.
- Name:René Gerritsen
- Email:rene.gerritsen@me.com
- Age:42
- From:Heek, Germany
20 Years
Developer Experience
7+
Programming Languages
100%
Love for Docker & Cloud
∞
Curiosity for Technology
Services
What I Do?
Custom Software Development
Specializing in PHP, JS, GO, I provide tailored software solutions for your specific needs. Whether it's a custom plugin or an API, you can rely on my expertise.
E-commerce Platform Expertise
With hands-on experience in Shopware and Magento, I help businesses optimize their online presence for maximum customer reach and engagement.
Travel Industry Solutions
My deep understanding of the travel industry allows me to develop software that addresses unique challenges, driving operational efficiency and growth.
Legacy Code Refactoring
Modernize your existing applications with my legacy code refactoring service, ensuring your software aligns with the latest technology standards for optimal performance.
CI/CD Pipeline Setup
I offer robust CI/CD pipeline setups that enable consistent, faster, and more reliable software releases, enhancing your productivity and reducing time-to-market.
Business Tech Consultation
My thorough understanding of various tech platforms can provide your business with the guidance it needs to leverage the best tech solutions for your growth.
SUMMARY
Resume
My Experience
2022 - Present
Software Developer
NFON AG, München
Responsible for the development and maintenance of the core API for web and mobile applications. Actively involved in the optimization of internal tools, including a translation tool and a call record portal. Played a key role in preparing the core API for the transition to PHP 8, including conducting unit and functional testing. Participated in transitioning a proxy API from PHP to Golang. Developed and implemented a Docker and Composer-based development environment, along with a CI/CD pipeline using Bamboo and Docker Composer. Integrated various interfaces with third-party software, and consistently focused on identifying and addressing bugs and security vulnerabilities. Maintained a steady and focused approach to work, ensuring high performance even during periods of high load.
2016 - 2022
Software Developer
Check24 Vergleichsportal Hotel, München
Engaged in backend API development, refactoring legacy code, and introducing DB migration scripts and automated tests with PHPUnit. Played a pivotal role in formulating integration guidelines for hotel providers and integrated various providers and channel managers. Focused on performance optimization and innovative solutions in hotel cluster matching and real-time room mapping using advanced technologies like Docker, PHP7, React.js, and more.
2009 - 2012
Software Developer
Wildcat Deutschland GmbH, Gronau
Focused on the conceptual development and implementation of a cross-platform RIA for jewelry customization with 3D preview. Involved in rendering laser production data and managing API-based communication with production partners, including status tracking. Set up and maintained a B2B shop on Shopware 3 for closed customer groups. Developed Shopware 3 plugins for features like closed customer groups, dealer login, and variant upgrades. Customized templates and designs for Shopware 3, developed an iPad 1 app using web technologies without a framework, and maintained brand shops on xt:Commerce. Also contributed to the development of the in-house fcTemplate framework and provided general IT support.
My Skills
Web Development Skills
PHP Development 90%
JavaScript 85%
Golang 70%
Bash 70%
SQL 85%
API Development 85%
Shopware Development 75%
Magento Development 70%
Full Stack Development 80%
React / ExtJs / HTML / CSS 75%
DevOps and Testing
Docker 90%
CI/CD Pipeline Implementation 90%
Unit and Functional Testing 90%
Software Engineering Principles
Problem Solving 90%
Refactoring 85%
Clean Code 85%
Software Pattern 80%
Software Architecture 85%
AI / ML
Prompt Design 60%
Python 60%
Sympy / Numpy 65%
Tensorflow / Neural Networks 40%
Design & 3D
Blender 60%
Photoshop 10%
My Work
Links
Testimonial
Client Speak
Dr. Jochen Bielek Head of Backend - Check24
“Herr Gerritsen verfügt über umfassende und vielseitige Fachkenntnisse und setzt sie stets sicher und zielgerichtet in der Praxis ein.”
