Experienced Software Engineer - Fulfillment Order Management; m​/f​/d

Customer Order Services (COS) is the strategic backbone for customer order data and processing at Media Markt Saturn . It consolidates order information, standardizes access through a common API model, and orchestrates fine-grained workflows that power the end-to-end online order journey.

Positioned as the main communication layer, COS connects the Order Management Systems (OMS) with major corporate applications — such as SAP Retail, Checkout, Payment systems, Invoicing applications, and Pick-and-Pack solutions — ensuring consistent, real-time order processing across the enterprise.

Responsibilities & Duties

• Design, implement, and evolve COS REST APIs and event schemas (OpenAPI, API Gateway), enabling contract-first integrations and decoupling consumers from Order Management platform.
• Develop and orchestrate event-driven order workflows with Kafka/Kafka Streams and Temporal (basket-to-order, payment/checkout, digital activation, fulfillment, transport management), ensuring reliability, idem-potency, and auditability.
• Build and maintain data persistence and propagation: model order data in Protobuf, MongoDB, PostgreSQL, drive real-time synchronization to corporate systems, and support analytics via Pub/Sub to Big Query with strong data quality and PII safeguards.
• Operate the platform on GCP/Kubernetes using Git Ops (Flux): monitor and troubleshoot production, optimize performance and scalability, manage incidents, and continually improve SLAs, security, and resilience.

• Strong experience building event-driven, distributed systems
• Proficiency in Kotlin on the JVM; solid Java skills; familiarity with Python or Type Script is a plus.
• Proven track record designing contract-first RESTful APIs with OpenAPI, including versioning, error models, and API gateway policies (e.g., Kong/Apigee).
• Practical experience with relational and noSQL databases (like MongoDB and PostgreSQL), schema design, transactions, performance tuning in high-throughput environments.
• Experience in cloud-native operations, e.g. on GCP with Kubernetes and Terraform;
  Git Ops (Flux), CI/CD, observability (logging, metrics, tracing), and production troubleshooting.
• Integration expertise using synchronous and asynchronous patterns (Kafka, Google Pub/Sub, etc.) across enterprise systems
• Strong focus on reliability, security, and compliance for customer order data (SLAs, auditability, PII/GDPR), with clear communication and cross-functional collaboration skills.

Media Markt Saturn  Technology is working to make Europe’s number-one consumer electronics retailer the technology leader in its industry. To this end, several hundred developers, UX designers and system architects using state-of-the-art technology work hand in hand with business owners in agile teams to develop customer-focused technology solutions for more than 6 million customers every day in 13 countries.

Within the Global Technology division, you are part of a strong cross-functional team of software engineers,data scientists and analytics experts to drive the development of our global product data management. Withinthe team and in close collaboration with the business product owner, you will design and develop data and analytics solutions on our cloud-based technology platform to support our business in product data management.

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Diversity and equal opportunities are important to us. Research shows that women and people from underrepresented groups are less likely to apply if they don’t meet all the criteria. If you are interested in this position but your experience doesn’t align perfectly with every requirement, we still encourage you to apply.

• Young environment
  , where not everything is written in stone, and where you are expected…