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## Software Development For me, software development is both, a craft and a passion: I have been learning all I can about programming languages, paradigms and adjacent technologies since I was 12 years old. I have made software development my profession starting 2013. As such, I am a competent and seasoned PHP (Symfony / Laravel), Golang and TypeScript / JavaScript developer that doesn't just implement the logic but ensures that the project is scalable and maintainable in the future. ## DevOps Running Linux on all kinds of devices, starting at Workstations and Linux but also including Phones, Microcontrollers, Single Board Computers, Routers has always been a hobby of mine. This makes me a passionate DevOps Engineer with practical knowledge about Linux, in both more traditional setups using tools like Ansible or Chef and more advanced setups using Docker, Kubernetes and CI/CD Pipelines. I will help modernize and streamline your software development workflow and infrastructure management to ensure maximum productivity of developers and high availability of your applications.…## Software Development For me, software development is both, a craft and a passion: I have been learning all I can about programming languages, paradigms and adjacent technologies since I was 12 years old. I have made software development my profession starting 2013. As such, I am a competent and seasoned PHP (Symfony / Laravel), Golang and TypeScript / JavaScript developer that doesn't just implement the logic but ensures that the project is scalable and maintainable in the future. ## DevOps Running Linux on all kinds of devices, starting at Workstations and Linux but also including Phones, Microcontrollers, Single Board Computers, Routers has always been a hobby of mine. This makes me a passionate DevOps Engineer with practical knowledge about Linux, in both more traditional setups using tools like Ansible or Chef and more advanced setups using Docker, Kubernetes and CI/CD Pipelines. I will help modernize and streamline your software development workflow and infrastructure management to ensure maximum productivity of developers and high availability of your applications.

Johannes Hertenstein

Full Stack Developer, Web Developer, Back-End Developer, +2

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## Software Development For me, software development is both, a craft and a passion: I have been learning all I can about programming languages, paradigms and adjacent technologies since I was 12 years old. I have made software development my profession starting 2013. As such, I am a competent and seasoned PHP (Symfony / Laravel), Golang and TypeScript / JavaScript developer that doesn't just implement the logic but ensures that the project is scalable and maintainable in the future. ## DevOps Running Linux on all kinds of devices, starting at Workstations and Linux but also including Phones, Microcontrollers, Single Board Computers, Routers has always been a hobby of mine. This makes me a passionate DevOps Engineer with practical knowledge about Linux, in both more traditional setups using tools like Ansible or Chef and more advanced setups using Docker, Kubernetes and CI/CD Pipelines. I will help modernize and streamline your software development workflow and infrastructure management to ensure maximum productivity of developers and high availability of your applications.…## Software Development For me, software development is both, a craft and a passion: I have been learning all I can about programming languages, paradigms and adjacent technologies since I was 12 years old. I have made software development my profession starting 2013. As such, I am a competent and seasoned PHP (Symfony / Laravel), Golang and TypeScript / JavaScript developer that doesn't just implement the logic but ensures that the project is scalable and maintainable in the future. ## DevOps Running Linux on all kinds of devices, starting at Workstations and Linux but also including Phones, Microcontrollers, Single Board Computers, Routers has always been a hobby of mine. This makes me a passionate DevOps Engineer with practical knowledge about Linux, in both more traditional setups using tools like Ansible or Chef and more advanced setups using Docker, Kubernetes and CI/CD Pipelines. I will help modernize and streamline your software development workflow and infrastructure management to ensure maximum productivity of developers and high availability of your applications.

Available to hire

Germany

Software Development

For me, software development is both, a craft and a passion: I have been learning all I can about programming languages, paradigms and adjacent technologies since I was 12 years old. I have made software development my profession starting 2013.

As such, I am a competent and seasoned PHP (Symfony / Laravel), Golang and TypeScript / JavaScript developer that doesn’t just implement the logic but ensures that the project is scalable and maintainable in the future.

DevOps

Running Linux on all kinds of devices, starting at Workstations and Linux but also including Phones, Microcontrollers, Single Board Computers, Routers has always been a hobby of mine.

This makes me a passionate DevOps Engineer with practical knowledge about Linux, in both more traditional setups using tools like Ansible or Chef and more advanced setups using Docker, Kubernetes and CI/CD Pipelines. I will help modernize and streamline your software development workflow and infrastructure management to ensure maximum productivity of developers and high availability of your applications.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Software Developer / DevOps Engineer at CROOX GMBH (Powderguide Conditions Reports)

January 1, 2024 - January 1, 2025

Modernization of mobile app and backend for Powderguide Conditions Reports; migrated backend from legacy Laravel + TYPO3 to a modern Laravel solution embedded in a Statamic-based site; ported TYPO3 login logic while preserving existing password hashes; rebuilt mobile app using React + TypeScript and Ionic.

Software Developer at CROOX GMBH (Powderguide Website)

January 1, 2023 - January 1, 2024

Migration of Powderguide website from TYPO3 to a Statamic-based site, including porting thousands of articles using a custom importer and data conversion to Statamic Bard format.

Software Developer at BIALLO & TEAM GMBH

January 1, 2024 - December 31, 2024

Migration from a legacy in-house system to a Neos-based website; scraper-based importer due to inaccessible legacy DB; backlog of articles and pages migrated.

Software Architect / PHP Developer at TELE COLUMBUS AG

January 1, 2022 - January 1, 2025

Modernization of a legacy PHP 5.6 sales system to PHP 8.4 / Symfony 7 with containerized deployment; modernization executed step-by-step to ensure continuous functionality and extensibility.

Software Developer at ESONO AG

January 1, 2020 - January 1, 2022

Developed an e-commerce platform based on Symfony; implemented client-specific logic for product import from multiple ERP systems, order/export flows, search & filtering, and newsletter features.

DevOps Engineer at ESONO AG

January 1, 2020 - January 1, 2022

Administration of Kubernetes clusters and DevOps pipelines for internal and external clients; built cost-effective on-prem clusters using off-the-shelf hardware; tools included GitLab CI, Jenkins, Rancher, Galera/GlusterFS, and containerized deployments.

Software Developer at Academic Institution NEST

January 1, 2021 - January 1, 2022

App for hybrid conferences providing attendees with information, session schedules, exhibitor connections, and start-time 1-on-1 calls; stack included Node.js, React, TypeScript, Jitsi Meet, and MySQL/MariaDB.

Software Developer at E-COMMERCE

January 1, 2020 - January 1, 2021

Development of a newsletter customization service processing large-scale id mappings (~200GB) with Redis and RabbitMQ for high-throughput personalization.

Technical Lead / Software Developer at LAND IN SICHT AG

January 1, 2017 - January 1, 2020

Built a tourism data management system from scratch; coordinated a team of 5–7 developers; distributed data to websites, catalogs, and kiosks; stack included Vue.js, PHP, MySQL, and HAXE.

Software Developer at NIMIUS AG

January 1, 2016 - January 1, 2017

Platform for calculating optimal rooftop solar installations; used Ruby on Rails, PostgreSQL, Turbolinks, Sidekiq.

Backend / Full-Stack Developer at Overlayr (Self-Started Product)

January 1, 2014 - January 1, 2018

Development of an application for stream overlays; initially built with Express.js (Node) and MySQL, later re-architected with Go microservices; features include overlay UI for live stream information.

Software Developer / DevOps Engineer at CROOX GMBH

January 1, 2024 - December 31, 2025

Modernization of the mobile app and backend for PowderGuide Conditions Reports. Migrated the backend from a legacy Laravel/TYPO3 mix to a modern Laravel version embedded in a Statamic-based site; ported TYPO3 login logic while preserving existing password hashes; rebuilt the mobile app using React and TypeScript and ported it to Ionic.

Software Developer / DevOps Engineer at Biallo & Team GmbH

January 1, 2024 - December 31, 2024

Migration of the Biallo website from a legacy in-house system to a Neos-based site, including a large backlog of existing articles and pages. Implemented a scraper-based importer due to inaccessible legacy database.

Software Developer / DevOps Engineer at CROOX GMBH

January 1, 2023 - December 31, 2024

Migration of the Powderguide website from a TYPO3-based system into a Statamic-based site. Involved migrating thousands of articles using a custom importer to convert data into Bard format used by Statamic.

Software Developer / DevOps Engineer at Tele Columbus AG

January 1, 2022 - December 31, 2025

Modernization of a legacy sales system from PHP 5.6 to a modern PHP 8.4 / Symfony 7 application with containerized deployment. The modernization was performed step by step to ensure continuous functionality and extendability.

DevOps / Systems Administrator at ESONO AG

January 1, 2020 - December 31, 2022

Cluster Administration & DevOps: Administration of Kubernetes clusters and DevOps pipelines for internal and external users, focusing on cost-efficient on-premise hardware rather than cloud providers.

Software Developer at Internal project

January 1, 2020 - December 31, 2021

Newsletter Customization Service: A service delivering personalized product suggestions via email, handling large-scale data (approx. 200GB of id-to-id mappings) using Redis and RabbitMQ.

Software Developer at Independent project

January 1, 2014 - December 31, 2018

Overlayr: Stream overlays assistant—backend started with Express.js and later migrated to Go microservices.