Kotlin Backend SW Engineer

• Develop and maintain services for customer order processing, covering the end-to-end online order journey.
• Build and manage APIs and integrations between the Order Management System and key corporate applications such as SAP, Checkout, Payments, Invoicing and Pick & Pack.
• Orchestrate order workflows to ensure consistent and real-time processing across different systems.
• Standardize order data and communication between multiple platforms and applications.

Your tasks

• 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.

• 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.

• Competitive gross salary in line with your experience (up to 50k)
• Flexible working hours
• Offices located in Barceloneta or El Prat de Llobregat, Barcelona
• 4 work from home days per week
• 27 days of vacation per year
• Training budget and language classes
• Young and dynamic tech environment with strong collaboration culture
• Long-term professional development plan and exposure to cutting-edge technologies