Senior Software Engineer, Fulfillment Orchestration

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

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.