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Senior Fullstack Developer PHP

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Senior Fullstack Developer PHP (m/f/d)

freshcells systems engineering GmbH is a software service provider based in Düsseldorf with a dynamic team of over 50 creative experts from various fields.

At freshcells, authenticity, individual talent development, and open communication are at the core of everything we do. We rely on respect, trust, and responsibility. As an innovation-driven company, we invest in new ideas. We know that the best results come from teamwork. We make mistakes – but we learn from them. We are open-minded and bold when it comes to exploring new paths.

Our DNA is centered around creating sustainable solutions with a strong commitment to excellence. We thoroughly analyze our projects in advance. That’s why we deliver what we promise. Our consulting is honest and customer-oriented.

Join us on our exciting journey in perhaps the most significant and forward-looking field of all – software development – as a Senior Fullstack Developer PHP (f/m/d) – Software Development (full-time)!

If you're excited by a diverse range of projects, want to continuously grow, and enjoy working independently and with a strong sense of responsibility, get in touch with us: recruiting@freshcells.de. We’re looking forward to hearing from you!

What do I need?

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 2025
  • 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
  • Room for own ideas and personal development
  • Digital training courses, available to every employee at his or her own discretion
  • Subsidy for Urban Sports Club membership
  • Subsidy for Deutschlandticket
  • Bike leasing via JobRad
  • 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 Node.js
  • Very good knowledge of modern PHP (v8 and above)
  • Very good knowledge of modern JavaScript (ES6 and above) and/or TypeScript
  • Very good knowledge of Next.js
  • Extensive knowledge of frontend frameworks and libraries such as ReactJS
  • 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.

Get in touch now