Hybrid PHP Backend Developer

at GRÜN Software Group

• Job title: PHP Backend Developer
• Job type: Full Time
• Experience level: Mid level, Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Apache, Docker, ERP, GraphQL, LAMP, Linux, MariaDB, MySQL, NGINX, PHP, Postgres, Symfony, WordPress
• Location requirements: Hybrid, Aachen, Germany

About the role

• Backend Developer creating custom PHP solutions for digital agency specializing in web and platform projects. Collaborating on Symfony, TYPO3, WordPress, and Headless systems.

Responsibilities

• Design and develop custom backend solutions with PHP (OOP), e.g. based on Symfony as well as custom CMS extensions (TYPO3/WordPress) and headless setups (Strapi)
• Develop, integrate and document REST and GraphQL APIs for dynamic web and platform applications
• Integrate external systems (e.g. ERP/CRM/payment/SSO), perform clean data and domain modeling, and build robust interface architectures
• Develop TYPO3 extensions, WordPress plugins and Symfony bundles to extend functionality
• Identify and resolve complex bugs, perform performance tuning and security hardening
• Take responsibility for build, test and deployment processes (CI/CD), including containerization and environment management
• Collaborative live/pair coding in the spirit of Vibecoding with concept designers, UX/UI designers and frontend teams
• Optional: Operate and further develop projects within Linux and LAMP/LEMP infrastructures (Apache/Nginx, MySQL/MariaDB, PHP)

Requirements

• Several years of professional PHP backend development experience (OOP, Composer, PSR standards)
• Solid knowledge of at least one relevant framework/CMS: Symfony, TYPO3 or WordPress — ideally a combination; openness to headless approaches (e.g. Strapi)
• Confident working with APIs (REST/GraphQL), webhooks and authentication/authorization (OAuth2/OpenID Connect, JWT)
• Routine with relational databases (MySQL/MariaDB; ideally also PostgreSQL) and ORMs such as Doctrine
• Experience developing custom extensions/plugins (TYPO3/WordPress) and bespoke functionality
• Version control with Git and experience with build, test and deployment pipelines (CI/CD); practical experience with Docker and Linux
• Basic understanding of modern frontend technologies and collaboration on API interfaces
• Required: Experience with Vibecoding (flow-oriented, collaborative live/pair/mob coding)
• Very good German language skills, both written and spoken (minimum B2)
• Self-motivated, structured working style and enthusiasm for real technical challenges

Benefits

• Flexible working hours
• Largely remote with a considered work–life balance
• Personal development budget for training, conferences and certifications
• Modern equipment (e.g. MacBook or notebook of your choice)
• Appropriate tools and flat hierarchies
• Benefits such as company bike (JobRad), gym membership, company pension scheme and regular team events
• Access to the expertise of the entire GRÜN Software Group, including GRÜN Campus projects with social impact