# Job Description:
For us**„Let’s Go!“**is not just a slogan, it is an attitude. We love technology and we want to excite. We have fun and want to inspire. Our customers and our teams. That’s why we are looking for people who share this spirit. People who are passionate about creating the shopping experience of the future together with 50.000 colleagues across Europe.
# Your tasks
- Design, implementation, and continuous evolution of COS REST APIs and event schemas (OpenAPI, Kong), enabling contract-first integrations and decoupling of consumers from OMS platforms
- Development and orchestration of event-driven order workflows using Kafka/Kafka Streams and Temporal (basket-to-order, payment/checkout, digital activation, fulfillment/TMS), with a focus on reliability, idempotency, and auditability
- Build-up, maintenance, and optimization of data persistence and propagation, including order data modeling in MongoDB and PostgreSQL, real-time synchronization with corporate systems, and support for analytics through Pub/Sub integration with BigQuery, ensuring high data quality and PII protection
- Operation and continuous improvement of the platform on GCP/Kubernetes using GitOps (Flux), including production monitoring and troubleshooting, performance and scalability optimization, incident management, and enhancement of SLAs, security, and platform 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 DBs (like MongoDB and PostgreSQL), schema design, transactions, performance tuning in high-throughput environments
- Cloud-native operations 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

# What's in it for you?
- International teams & versatile tasks
- 30 days vacation & subsidized company pension plan
- Employees discount & Fitness Collaborations
- Training & Education
- Open corporate culture & Teamwork
- Mobile work

# About us
MediaMarktSaturn 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 11 countries.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 next to the Enterprise Service Bus, 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.Our best solutions arise when diverse perspectives come together. Diversity is key to achieving our vision of becoming the Experience Champion in Consumer Electronics. We value diversity, promote equal opportunities, and foster inclusion – join our team!Your HR contact**Laura Schröder**Let's Go!Ready? We are looking forward to receiving your application!Apply now