Senior Full Stack Developer PHP

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Senior Full Stack Developer PHP (m/f/d)

freshcells systems engineering GmbH is a software service provider based in Düsseldorf with a dynamic team of over 40 creative experts from various fields.

We focus on authenticity, individual talent development and open communication. We build on respect, trust and responsibility. As an innovation-driven company, we invest in new ideas. We know that the best results are achieved as a team. We make mistakes, but we learn from them. We are open and courageous for new paths.

Join us on our exciting journey in what is probably the most important and forward-looking area - software development - as a Senior Full Stack Developer PHP (m/f/d)!

Please send us your application via email to

The freshcells spirit

  • We always remain ourselves.
  • We promote individual talents.
  • We are creative nerds from a wide variety of fields.
  • We do not hide.
  • We communicate openly, honestly & fairly.
  • We build on respect, trust & responsibility.
  • We are innovation driven and willing to invest in ideas.
  • We know that the best results can only be achieved as a team.
  • We make mistakes, but we learn from them.
  • We are open, we are courageous.

What we have to offer

Kununu Open Company
Kununu Top Company
Kununu Top Company 2022
Kununu Top Company 2023
  • Flexible home office days
  • Flex-time for early risers and night owls
  • A dog-friendly working environment
  • A secure and long-term job
  • Company pension plan with employer subsidy possible
  • Regular exchange, feedbacks, team meetings & retrospectives
  • Monthly Company Breakfast
  • Summer, Christmas and company parties
  • High-end equipment also for private use
  • Room for own ideas and personal development
  • Digital training courses, available to every employee at his or her own discretion
  • Subsidy for the Urban Sports Club membership
  • Subsidy for the Deutschlandticket
  • Support with relocating processes
  • Free German courses for newcomers

Your Responsibilities

  • Development of modern frontend applications based on ReactJS, Next.js and TypeScript
  • Development of APIs based on GraphQL
  • Development of modern backend applications based on Node.js and PHP Symfony
  • Design and implementation of new features for sophisticated software solutions in cooperation with project management, design, and development departments
  • Writing and maintaining our automated test suites
  • Participation in continuous improvement processes

Your Qualifications

  • Very good knowledge of modern JavaScript (ES6 and above) and/or TypeScript
  • Very good knowledge with Next.js
  • Extensive knowledge of frontend frameworks and libraries such as ReactJS
  • Good knowledge of modern PHP (v8 and above)
  • Good knowledge of PHP frameworks and libraries such as Symfony and/or Laravel
  • SQL experience with relational databases
  • Good understanding of established and evolving Web APIs
  • Competences in consuming and creating web services based on REST and especially GraphQL
  • Know-how in performance optimization
  • Basic knowledge of HTML and CSS is helpful
  • Experience with agile development in a team
  • Hands-on experience with automated software testing
  • Basic knowledge in API security
  • Fluent in English

Nice to have

  • Experience with containerization technologies such as Docker and container orchestration tools like, i.a., Kubernetes, OpenShift, or Docker Swarm
  • Knowledge of designing and adapting software according to the twelve-factor methodology
  • Knowledge of continuous integration via tools like bitbucket or Jenkins
  • Experience with Object-relational mapping, e.g. using Doctrine in PHP
  • Experience with headless CMS such as Strapi
  • Experience with PostgreSQL
  • Experience with Apollo Federation

Take the initiative

Please note

Applications sent by post cannot be taken into account during the application process. For this reason, application portfolios will also not be returned.