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, Open Search 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 architectures Production-level experience in backend development using Java Familiarity with cloud platforms (AWS, GCP, or Azure) and containerized deployments (Docker, Kubernetes)A problem-solving mindset with the ability to debug complex distributed systems Strong communication skills and the ability to work effectively in a collaborative environment Strong background in database design and optimization, particularly with MongoDB, Cassandra, or other distributed databases Experience with observability, logging, and monitoring tools for debugging and performance analysis Experience with modern Frontend frameworks like React Experience with MongoDB and Open Search Knowledge of message brokers like Kafka and RabbitMQ

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