Senior Fullstack Engineer – Developer Platform (f/m/d)

We're the Developer Platform team within the AI & Cloud Platform department, and we build the foundations the other engineering teams at JTL rely on. Our work spans three areas:

• Developer Enablement: engineering standards, shared tooling, CI/CD, and internal developer documentation that make product teams more productive.
• Cloud Platform Enablement: self-service building blocks for our first-party apps, from deployments and infrastructure to identity and API management.
• External Developer Relations: public developer documentation, SDKs and CLIs, our public APIs and API gateway, and developer community and events.

AI enablement is a major focus for our department and our team: most of the platform features we ship are designed AI-first.

• You work on the platform topics that matter most right now. Our focus shifts each quarter depending on where the company needs it most — sometimes frontend, sometimes backend, sometimes infrastructure
• You develop standards, guidelines, and best practices for frontend and backend at JTL
• You create and maintain templates, boilerplates, and libraries that help other teams work more productively and efficiently
• You support the bootstrapping of new projects, so our standards and toolchains are applied from the start
• You regularly evaluate new technologies and assess their value for our landscape

• You have several years of professional experience in fullstack development
• You are strong in one stack and solid in the other: React and TypeScript on the frontend, .NET 8 / C# on the backend
• Frontend: component-based development and design systems (Storybook, TailwindCSS), state management and data fetching (e.g. TanStack Query), modern build tools (Vite, turborepo, pnpm), and testing (Vitest, Jest, Playwright)
• Backend: CQRS and Domain-Driven Design (DDD), API development with FastEndpoints, and familiarity with GraphQL — ideally having designed a GraphQL API
• You are confident with Docker and common containerisation workflows, and with Git and collaborative workflows (pull requests, code reviews)
• You communicate clearly in writing and speech — a big part of the role is driving standards and best practices across teams
• You have a solid understanding of and genuine interest in AI development, since most of the platform features we ship are designed AI-first
• You have business-fluent English (written and spoken) and good German skills
• Terraform and hyperscalers, preferably Azure
• Micro-frontends
• CI/CD pipelines (GitHub Actions)
• Basic Kubernetes and Helm
• Infrastructure as Code (IaC), GitOps, and experience with Argo

• Remote-first within Germany, with the option to work remotely from eligible countries for up to 180 days per year
• Meal allowance of up to €115 net per month
• Ergonomic workspace allowance for your home office setup
• Regular team events, company-wide gatherings, and summer and Christmas parties to stay connected as a remote-first company
• EGYM Wellpass and JobRad subsidy
• Financial benefits including capital-forming payments (Vermögenswirksame Leistungen) and a company pension scheme