Senior Fullstack Engineer (H/U/M/A/N) full-time remote/hybrid (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 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 taskCares deeply about clarity, naming, and tradeoffsWants to understand why something works, not just that it doesFeels uneasy when the wrong abstraction appears repeatedlyCan clearly explain concepts to a junior dev, PM, or their future selfWe don’t expect trivia—but we do expect curiosity and solid mental models. You should be familiar with:Why { } === { } is false in JavaScriptWhat happens if you pass a new object in a React hook dependency arrayHow closures work and why they matterAvoiding side effects that break memoizationWhy abstraction is about boundaries—not just DRYIf you already care about reference semantics, testability, or naming, you’ll feel at home here.TasksDevelop and maintain backend APIs using Website complex frontend behaviors with ReactWork across a shared, client-customizable codebaseRecognize emerging patterns, craft reusable abstractions, and refactor responsiblyInfluence structure, testing, and performance in the codebaseContribute to technical decision-making—not just execute ticketsRequirementsVery good knowledge of Node.JSStrong knowledge of ES 6 JavaScript as well as extensive knowledge of frameworks and libraries such as reactJS, vue.js and/or AngularSound experience with relational or non-relational databasesGood knowledge of data structure designCompetences in consuming and creating web services based on ReST and especially GraphQLKnow-how in performance optimizationBasic knowledge of HTML and CSS is helpfulExperience with agile development in a teamHands-on experience with automated software testingBasic knowledge in API securityFluent in EnglishNice to have:Experience of PHP, ideally with frameworks such as Symfony, Laravel or YiiExperience with containerization technologies such as Docker etc.Experience with container orchestration tools like, i.a., Kubernetes, OpenShift, or Docker SwarmKnowledge of designing and adapting software to be twelve factor applicationsKnowledge of continuous integration via tools like JenkinsExperience with Next.jsExperience with TypeScriptAll 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! #J-18808-Ljbffr