Your Tasks
Customer Order Services (COS) is the strategic backbone for customer order data and processing at MediaMarktSaturn. 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 BigQuery with strong data quality and PII safeguards.
Operate the platform on GCP/Kubernetes using GitOps (Flux): monitor and troubleshoot production, optimize performance and scalability, manage incidents, and continually improve SLAs, security, and resilience.
Your Profile
Strong experience building event-driven, distributed systems
Proficiency in Kotlin on the JVM; solid Java skills; familiarity with Python or TypeScript 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; GitOps (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.
About Us
MediaMarktSaturn Technology is working to make Europe's number-one consumer electronics retailer thetechnology leader in its industry. To this end, several hundred developers, UX designers and system architectsusing 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 integral product data management.



Withinthe team and in close collaboration with the business product owner, you will design and develop data andanalytics solutions on our cloud-based technology platform to support our business in product datamanagement.
(*)
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.
Additional Benefits
Young environment
, where not everything is written in stone, and where you are expected to contribute and co-create the culture of the Tech Hub and
international collaboration model
You'll have a
10% discount
on the entire
MediaMarkt website
, so you can treat yourself at a lower price whenever you want
On top of your
compensation package
, you can request Flexible Pay "MediaFlex program" (a.e. Ticket Restaurant, Private Health Insurance with
Adeslas
, )
Flexible working
time and possibility to combine home office / presential working.
Intensive workday
every Friday and during summer
The possibility to choose between
2 offices
: The first one is the
MediaMarkt Iberia HQ
with a very attractive menu at a price. You'll eat for less than €4 And the second office is located at
Pier01, in Barceloneta
, right in the center of Barcelona. Free coffee and free fruit once a week
There is a
training budget
so you can continue developing the skills you need most to keep growing professionally and personally
We
offer language classes
:
English, Spanish, and German
On your birthday
, you won't work
It'

📌 Experienced Software Engineer (España)
🏢 Mediamarktsaturn Plattform Services
📍 España