(Senior) PHP Software Developer Backend


starting immediately, Cologne (Mediapark), fulltime, unlimited

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 United Internet AG group provides support in the background to achieve this goal.

Our Technology Stack:

  • We use PHP 7, Kubernetes, nginx, Lua, OpenResty, HAProxy for our parking application.
  • Our backends and jobs are based on PHP, MySQL and Scribe. Furthermore we use Prometheus, Grafana, Elasticsearch and Kibana.
  • Additionally, we integrate with other products using the APIs of the providers (e.g. Google Cloud Platform or Salesforce).
  • We are into clean code, have a uniform codestyle that we discuss a lot and develop together.
  • A high code quality is extremely important to us. We therefore take our test code just as seriously as our production code.
  • -We have a centralized continuous delivery system with a net and a double bottom, which we use to roll out new software to our customers several times a day. With one click!

Your tasks:

  • Design and development of new and enhancement of existing features to solve challenging customer requirements
  • Defense against recurring external and complex DDos attacks
  • Permanent and consistent optimization of our parking algorithms
  • Participation in the design of our software architectures and the selection of technologies
  • Active participation in agile work processes

Your profile:


  • Interested in new technologies; using and growing with our existing tech stack
  • Several years of in-depth experience in PHP backend development
  • A sense of responsibility, teamwork, pragmatism, creativity and reliability
  • Fluent German and English skills
  • Successfully completed studies in computer science / business informatics or a comparable qualification

Our benefits for you:

  • Work-life balance: trust-based working hours, home office, 30-day vacation entitlement, fitness offers
  • Environmentally friendly way to work: employer-financed KVB job ticket
  • Free choice of hardware: MacBook Pro or Dell notebook
  • Top offices: central location in the Mediapark and freshly renovated rooms with latest equipment
  • Personal development: individual training agreements
  • Attractive employee discounts: corporate benefits, ticketsprinter
  • Refreshments flat rate: coffee / tea / water, fresh fruits
  • Company events: summer, Christmas and team events
  • Rock-solid job in future proofed industry!

Do you want to make a difference at Sedo?

If you feel addressed and want to become part of our international and agile culture, then donĀ“t wait! Write an email with your complete application documents to [email protected]


Sedo GmbH

Julia Meik

Human Resources

0221 0340 30 290

[email protected]