(Senior) PHP Softwareentwickler Backend (m/w/d) Marketplace

  • starting immediately
  • Cologne (Mediapark)
  • Permanent
  • Full-time

We are: THE experts of the first hours around domains. We have more than 20 years of experience in e-commerce and we work in interdisciplinary teams every day to create the best possible user experience for more than 2 million customers worldwide. Our common goal? Success that is sustainable! The IONOS group provides support in the background to achieve this goal.


Are you fluent in PHP? And it appeals to you to ensure a first-class domain trading platform for our customers at all times with your profound technological know-how and thus to keep our world's largest trading place technically on top? Then become an integral part of our marketplace team, in which you can fully exploit the technological potentials, consistently optimize existing products and processes and set up our tech stack for the future!

Our technology stack:

  • PHP 7/8; Symfony, Composer, Git
  • We use JavaScript (ES2015+, Node.js, Vue.js, Yarn, npm, etc.) for our frontend und Single Page Applications.
  • At Sedo, we integrate a variety of third-party products and use the providers' APIs to do so (e.g. Adyen, Oracle Cloud).
  • A high code quality is extremely important to us. We therefore take our test code just as seriously as our production code.
  • With our central Continuous Delivery System, we can roll out new software in different environments several times a day. For this we use among others, Git, Helm and Jenkins. Simply through merging and tagging.
  • We mainly operate our applications as Docker containers in a private cloud managed Kubernetes cluster.
  • We use central logging (ELK), Prometheus, Grafana and Icinga for analysis, metrics and monitoring of our productive operations.

Your tasks:

  • Continuous Modernization of our software, processes and tools as well as development of new features to solve complex customer requirements by using state-of-the-art technologies.
  • Continuous Deployment and operation of our own services
  • Willingness to engage in professional development, such as in Java
  • Active participation in agile work processes

Your profile:

  • Fun with new technologies and interested in working and growing with our existing tech stack.
  • Several years of in-depth experience in PHP backend development. 
  • Experience with frameworks such as Symfony.
  • A plus: DevOps skills and know-how about microservice architectures and Docker / Kubernetes.
  • Sense of responsibility, ability to work in a team, pragmatic, curious and willing to learn
  • Fluency in German and English.
  • Successfully completed degree in (business) computer science, successfully completed training or comparable qualifications.

Our benefits for you:

  • Stamping is so 90s: We offer trust-based working hours, home office and, of course, 30 days of vacation.
  • For the sake of the environment: We'll gladly finance your eco-friendly commute with a Deutschland ticket.
  • In the heart of Cologne: Located in the Mediapark, freshly renovated premises with state-of-the-art equipment.
  • You never stop learning: From comprehensive onboarding to individual training agreements
  • Employee discounts: corporate benefits, ticket sprinter, fitness studio membership
  • Unlimited refreshments: coffee, various beverages, fruit, pretzels and many team souvenirs
  • Company events: summer, Christmas, team events
  • Rock solid job in a future-proof industry!


Sedo GmbH

Van Nghiem

Talent Acquisition (PX)

Tel: +49 221 340 30 290

Web: www.sedo.de