Senior Fullstack Engineer (HUMAN) full-time remotehybrid (Düsseldorf, Germany)

freshcells systems engineering GmbH is a software service provider based in Düsseldorf with a dynamic team of over 50 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 dont have to know everything. But you should want to know why.

Were 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 dont expect triviabut 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 boundariesnot just DRY

If you already care about reference semantics testability or naming youll feel at home here.

Tasks

• Develop and maintain backend APIs using 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-makingnot just execute tickets

Requirements

• Very good knowledge of
• Strong knowledge of ES 6 JavaScript as well as extensive knowledge of frameworks and libraries such as reactJS 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
• 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 get in touch with us: recruiting((at))freshcells(.)de. We look forward to hearing from you!