Senior Backend Engineer - Developer Platform (f/m/d)

JTL is one of the leading providers of e-commerce software in the German-speaking region, with around 450 employees across the group and more than 50,000 customers from a wide range of industries. We build scalable, flexible solutions for the future of online retail – from ERP systems to shop and marketplace integrations.

We are the Developer Platform team within the AI & Cloud Platform department. We build the foundations that enable JTL's engineering teams to work efficiently and deliver high-quality products.

Our work focuses on three key areas:

• Developer Enablement: Engineering standards, shared tools, CI/CD, and internal developer documentation that help product teams become more productive
• Cloud Platform Enablement: Self-service building blocks for our first-party applications, covering everything from deployments and infrastructure to identity management and API management
• External Developer Relations: Public developer documentation, SDKs and CLIs, our public APIs, the API gateway, as well as developer communities and events

AI enablement is a major focus of our department and team: Most platform features we deliver are designed with an AI-first mindset. As a Backend Engineer, you will primarily contribute to the first two areas: Developer Enablement and Cloud Platform Enablement.

• Develop API solutions based on FastEndpoints and support the evolution of JTL's company-wide GraphQL API where your expertise is needed
• Define and establish backend development standards, guidelines, and best practices across JTL's engineering teams
• Create and maintain templates, boilerplates, and libraries that enable other teams to work more efficiently and productively
• Build and evolve cloud platform components, including self-service deployments, infrastructure using Terraform and Azure, and the central API gateway
• Ensure robust, maintainable, and scalable software architectures through the use of .NET 8, CQRS, and Domain-Driven Design (DDD)
• Support teams in adopting new standards and practices, as well as bootstrapping new backend projects.
• Regularly evaluate new technologies (e.g. SignalR) and assess their potential value for our backend ecosystem

• Several years of experience in backend development with a strong focus on modern .NET technologies, particularly .NET 8
• Strong understanding of software architecture principles, including CQRS, Domain-Driven Design (DDD), and modern development patterns and libraries
• Experience designing and developing GraphQL APIs and working with event-driven architectures and messaging systems, ideally with Azure Service Bus
• Hands-on experience with NoSQL databases, especially Azure Cosmos DB, and building reliable, well-tested software using frameworks such as XUnit and Shouldly
• Confident working with Docker, containerization workflows, and cloud infrastructure, ideally on Microsoft Azure, including experience with Terraform
• Strong knowledge of Git and collaborative development workflows, including pull requests, code reviews, and engineering best practices
• Strong interest in AI-driven product development and enthusiasm for building AI-first solutions
• Excellent communication skills and the ability to drive technical standards and best practices across teams.
• Fluent in English, with good German communication skills
• Experience with SignalR, GitHub Actions, Kubernetes, Helm, Infrastructure as Code (IaC), GitOps, and 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
• Support for setting up an ergonomic home office
• Regular team events, company-wide gatherings, and summer and Christmas celebrations
• EGYM Wellpass and JobRad subsidy
• Employee savings benefits and company pension scheme