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

• PHP Backend Developer designing and developing backend solutions using PHP frameworks for digital agency projects. Collaborating with cross-functional teams on innovative web applications and APIs.

Responsibilities

• Design and develop bespoke backend solutions using 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 fix complex bugs, perform performance tuning and security hardening
• Take ownership of build, test and deployment processes (CI/CD), including containerization and environment management
• Collaborative live/pair-coding in the spirit of Vibecoding with planners, 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
• Mandatory: experience with Vibecoding (flow-oriented collaborative live/pair/mob coding)
• Very good German language skills, written and spoken (at least B2)

Benefits

• Flexible working hours
• Largely remote work and a considered work–life balance
• Individual professional development with a training budget, conferences and certifications
• Modern equipment (e.g. MacBook or laptop of your choice)
• Appropriate tools and flat hierarchies
• Benefits such as JobRad (bike leasing), gym memberships, company pension plan and regular team events
• Access to the expertise of the entire GRÜN Software Group, e.g. via GRÜN Campus