Backend Developer PHP (f/m/d) - IT Security Business

Your tasks

As a Backend Developer, you'll take a leading role in developing PHP-based microservices and APIs . Do you also prioritize clean code as much as we do? You would be a great fit for our team.

• As part of a 7-person team, you will steer the development of microservices and RESTful APIs
• Collaborating with other teams, you will set service boundaries and make sure microservices communicate well
• You will monitor the performance and fix any issues in order to maintain low latency and high availability

Your profile

• Minimum 3 years experience as a PHP Developer with a focus on Microservices and APIs
• Strong skills in PHP, RESTful API design, and frameworks like Symfony, Laravel, or Lumen
• Experience with databases (e.g., MySQL, PostgreSQL, or NoSQL)
• Knowledge of container technologies (Docker)
• Understanding of version control systems, continuous integration, and continuous deployment (CI/CD) pipelines.
• Nice to have: Knowledge in GoLang
• You explain technical topics so clearly that everyone can work together productively in meetings, regardless of their technical background.
• Languages: please pay attention! German (minimum B1) is required for this position, alongside fluent English

We offer

• Flexible working hours and home office possible
• Mobility: free Germany ticket, job bike leasing or car parking
• Allowances for food (e.g. Lieferando) and internet in the home office
• Benefits in the office: Roof terraces & green courtyard, organic fruit and drinks, parcel acceptance
• Get-together: pizza Friday in the office, regular team events, big summer party

About us

Why Zertificon?

Zertificon stands for securing digital business. We develop trusted IT security solutions "Made in Germany" -- built for businesses that value both protection and usability.

• Independent & committed: For over 20 years, we've built secure communication tools -- as an owner-managed company with a clear stance
• Purpose-driven: We believe that digital communication must be secure and free. If you think Edward Snowden did the right thing as a whistleblower, we might just share the same values. As a sign of our support, we donate €1,000 to an organization that supports Edward Snowden for every new hire who mentions him in their application
• Hands-on excellence: We take on complex challenges because we can. Our in-house experts are top-tier -- even external specialists often learn from us. When we want the best, we build it ourselves
• Agile by conviction: We think fast, act pragmatically, and improve continuously. No bloated processes, no "that's just how it's always been done." Initiative is welcome -- but of course, it will be challenged, and not every idea will make it through unchallenged
• Security that works: We build software that's not only secure, but actually usable -- not just for large enterprises with dedicated highly skilled IT teams, but also for small and mid-sized businesses that need strong security without the complexity
• Diverse & international: Our team of 130 people from 30+ countries shares one mission: making secure digital communication easily accessible to businesses of all sizes

If that resonates with you, we'd love to hear from you.