freshcells systems engineering GmbH is a software service provider based in Düsseldorf with a dynamic team of over 60 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 ways.
Join us on our exciting journey in what is probably the most important and forward-looking area - software development - as a Senior Fullstack Engineer (m/f/d) in full-time hybrid or remote.
We hire people who want to understand how things work, not just how to wire them together.
You don’t have to know everything. But you should want to know why.
We’re seeking a person who thinks like an engineer:
Sees code as part of a system, not just a task
Cares deeply about clarity, naming, and tradeoffs
Wants to understand why something works, not just that it does
Feels uneasy when the wrong abstraction appears repeatedly
Can clearly explain concepts to a junior dev, PM, or their future self
We don’t expect trivia—but we do expect curiosity and solid mental models. You should be familiar with:
Why { } === { } is false in JavaScript
What happens if you pass a new object in a React hook dependency array
How closures work and why they matter
Avoiding side effects that break memoization
Why abstraction is about boundaries—not just DRY
If you already care about reference semantics, testability, or naming, you’ll feel at home here.
Tasks
Develop and maintain backend APIs using Node.js/TypeScript
Implement complex frontend behaviors with React
Work across a shared, client-customizable codebase
Recognize emerging patterns, craft reusable abstractions, and refactor responsibly
Influence structure, testing, and performance in the codebase
Contribute to technical decision-making—not just execute tickets
Requirements
Very good knowledge of Node.JS
Strong knowledge of ES 6 JavaScript as well as extensive knowledge of frameworks and libraries such as reactJS, vue.js and/or Angular
Sound experience with relational or non-relational databases
Good knowledge of data structure design
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 of PHP, ideally with frameworks such as Symfony, Laravel or Yii
Experience with containerization technologies such as Docker etc.
Experience with container orchestration tools like, i.a., Kubernetes, OpenShift, or Docker Swarm
Knowledge of designing and adapting software to be twelve factor applications
Knowledge of continuous integration via tools like Jenkins
Experience with Next.js
Experience with TypeScript
All people are welcome here, regardless of gender, age, sexual identity, origin, religion, ideology, with or without a disability. The main thing is that you fit in with us.
If you are interested in a wide-ranging portfolio of projects, want to continuously develop yourself and enjoy working independently and responsibly, apply with the button on this page.
Want to get a glimpse of who we are and what it's like to work with us? Watch our video here: https://www.youtube.com/watch?v=9GEFoSIUPjU
We look forward to hearing from you!
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