Experienced Software Engineer - Fulfillment Order Management (m/f/d)

MediaMarktSaturn Plattform Services GmbH; Barcelona; Hybrid; EUR 70,000 - 120,000; Full time

Benefits offered by this job

Discounts on MediaMarkt site

Flexible pay program

Flexible working

Training budget

Language classes

Birthday off

Office Barcelona and Pier01

Job summary

MediaMarktSaturn Plattform Services GmbH is seeking a senior backend engineer to design and evolve COS REST APIs and event-driven workflows that connect OMS with SAP Retail, Checkout, and invoicing systems. You will work on GCP/Kubernetes with Flux and implement secure, high-throughput order processing.

You will collaborate across teams to ensure data quality, GDPR compliance, and reliability while optimizing performance and SLAs in a global tech environment in Barcelona.

Qualifications

• 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.

Responsibilities

• Design, implement, and evolve COS REST APIs and event schemas (OpenAPI, API Gateway).
• Develop and orchestrate event-driven order workflows with Kafka/Kafka Streams and Temporal.
• Build and maintain data persistence and propagation: Protobuf, MongoDB, PostgreSQL; real-time synchronization to corporate systems; analytics via Pub/Sub to BigQuery.

Skills

Kotlin

Java

Python

TypeScript

OpenAPI

API gateway

Event-driven

Kafka

Distributed systems

Tools

Kafka

Kubernetes

GCP

MongoDB

PostgreSQL

Protobuf

BigQuery

Flux

Job description

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 global 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 budgetso 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's a day for you to enjoy without thinking about work
• You'll be working with the most cutting-edge technological stack of the moment

Job Infos

Location:Barcelona, El Prat De Llobregat

Media Markt Saturn Th Services Barcelona

Department:HQ - IT

Entrylevel:Professional Level

Type of Employement:Full Time

Working Hours:40

Persona:Job Requisition Tech Employee