Senior Software Engineer - Fulfillment Orchestration (Hybrid)

MediaMarktSaturn Plattform Services GmbH; Bellprat; Hybrid; EUR 70,000 - 90,000; Full time

Benefits offered by this job

Discounts on MM site

Flexible pay

Flexible working

Two Barcelona offices

Training budget

Language classes

Birthday off

Cutting-edge tech stack

Job summary

MediaMarktSaturn Plattform Services GmbH is seeking a backend engineer to design and evolve COS REST APIs and event-driven workflows. You will work with OpenAPI, API Gateway, Kafka, and Temporal to ensure reliable order processing across the enterprise.

You will model data in MongoDB and PostgreSQL, and enable real-time synchronization to SAP and other core systems. You will operate in a cloud-native setup on GCP with Kubernetes, Terraform, and Flux, focusing on reliability, security, and

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 (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.

Responsibilities

• 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.
• Integration expertise using synchronous and asynchronous patterns across enterprise systems

Skills

Event-driven systems

Kotlin on JVM

Java

OpenAPI design

RESTful APIs

Kafka

PostgreSQL / MongoDB

GCP Kubernetes

Terraform / GitOps

CI/CD observability

Tools

OpenAPI / API Gateway

Kong/Apigee

MongoDB

PostgreSQL

Kafka

Google Pub/Sub

BigQuery

Kubernetes

Flux

CI/CD tooling

Job description

MediaMarktSaturn Plattform Services GmbH is seeking a backend engineer to design and evolve COS REST APIs and event-driven workflows. You will work with OpenAPI, API Gateway, Kafka, and Temporal to ensure reliable order processing across the enterprise.

You will model data in MongoDB and PostgreSQL, and enable real-time synchronization to SAP and other core systems. You will operate in a cloud-native setup on GCP with Kubernetes, Terraform, and Flux, focusing on reliability, security, and