Description
About Sinch
Sinch is pioneering the way the world communicates. More than 150,000 businesses — including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email.
Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey.
At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation
Essence of the Role
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.
What You’ll Do
- 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.

Requirements
- Production-level experience in backend development using Java.
- Deep understanding of distributed systems and experience building high-scale microservices an

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