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# Backend PHP developer

- **Company:** Mixvoip's Saga
- **Location:** Luxemburg, Belgium
- **Contract:** Permanent contract
- **Skills:** PHP (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, VoIP, Cron, Linux, Networking Basics, Routing, Wireless Networks, AI Coding Agents, Backend, Twig (templating), Templating, Claude, Api Management, Docker
- **Published:** October 27, 2026
- **Apply:** https://www.mixvoip.com/company/career/backend-php-developer-with-linux-focus/

## About the Role

* Strong PHP fundamentals and backend development experience
 * Comfortable working in a Linux environment
 * Experience building backend services or automation tools
 * Familiar with API integrations and structured data formats
 * Comfortable working with CLI tools, cron jobs, and background processes
 * Methodical troubleshooting and clear communication
 * Able to take ownership of systems you develop
 * Comfortable using AI coding tools (e.g., Claude) as part of daily work, * Experience with VoIP or telecom systems
 * Familiarity with SIP, PBX systems, or Asterisk
 * Experience generating configuration files or working with templating systems
 * Experience with Docker-based development environments
 * Understanding of networking basics (IP, routing, firewalls)
 * Interest in infrastructure-oriented backend systems
 * Strong documentation habits and clean engineering practices

## Description

You will join the PBX development team and work on the backend systems that power our cloud-based phone platform.
This is not a traditional web development role. There is no frontend, UI, or CSS work. Most of the work happens in backend services, automation scripts, and configuration generation interacting directly with our VoIP infrastructure.
You will write PHP code that generates configuration files, automates device provisioning, integrates with internal and external APIs, and implements new features for our PBX platform.
Much of the code runs outside of a browser context through CLI tools, background workers, or scheduled jobs. Because of this, working comfortably in a Linux environment is important.
This role also requires a regular on-site presence at our office in Luxembourg. Close collaboration with the team and hands-on interaction with the systems you will be working on are an important part of the position, so this is not a remote role.
You will not be thrown in alone, but you are expected to take ownership of what you build, understand how it interacts with the rest of the platform, and continuously improve the systems you work on., * Develop backend features for our PBX platform

 * Implement new call routing and configuration capabilities
 * Build automation for provisioning VoIP devices (Yealink, Gigaset, Grandstream)
 * Integrate internal systems and external vendor APIs
 * Develop CLI tools and background jobs used in the platform
 * Generate and maintain configuration templates using Twig
 * Troubleshoot and improve backend automation interacting with VoIP infrastructure
 * Document systems, code, and operational workflows