As a Senior Software Engineer, you will play a key role in designing and building the next generation of our Contacts Platform. You will work in a dynamic, collaborative environment to develop scalable distributed systems. Your contributions will directly impact the efficiency, performance, and safety of conversations at scale Design, develop, and maintain backend services for Contacts Platform, while contributing to our frontend applications Build high-performance, scalable, and distributed systems Work with Java, Spring, Kafka, MongoDB, OpenSearch to enhance our product, ensuring safety, efficiency, and responsiveness Develop internal tools for monitoring, debugging, and optimizing applications at scale Ensure observability, reliability, and fault tolerance across all services Collaborate with cross-functional teams including Software Engineers, UX Designers and Product Managers Maintain a strong focus on code quality, security, and best practices in software development This is a 95% remote role.



You must be based in Spain and we will bring you to the office in Madrid for some days every quarter Deep understanding of distributed systems and experience building high-scale microservices and event-driven architecturesProduction-level experience in backend development using JavaFamiliarity with cloud platforms (AWS, GCP, or Azure) and containerized deployments (Docker, Kubernetes)A problem-solving mindset with the ability to debug complex distributed systemsStrong communication skills and the ability to work effectively in a collaborative environmentStrong background in database design and optimization, particularly with MongoDB, Cassandra, or other distributed databasesExperience with observability, logging, and monitoring tools for debugging and performance analysisExperience with modern Frontend frameworks like ReactExperience with MongoDB and OpenSearchKnowledge of message brokers like Kafka and RabbitMQ

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📌 Senior Java Backend Engineer (Madrid)
🏢 Sinch
📍 Madrid