About the role

Role Overview

Join Sinch as a Senior Java Backend Engineer to design and build the next generation of the Contacts Platform. You’ll develop scalable distributed systems in a collaborative environment, prioritizing safety, efficiency, and responsiveness.

Work model: ~95% remote with occasional travel to the Madrid office.

Key Missions & Responsibilities

Design, develop, and maintain backend services for the Contacts Platform with high performance and scalability.
Collaborate cross-functionally to improve the product, with a focus on code quality, security, and best practices.
Build internal tools for monitoring, debugging, and optimization at scale to ensure observability and reliability.

Requirements

Production-level backend experience with Java.
Experience with observability: logging and monitoring for debugging and performance analysis.
Familiarity with cloud platforms (AWS, GCP, or Azure) and containerized deployments (Docker, Kubernetes).
Strong communication and teamwork skills.
Deep understanding of distributed systems; experience building high-scale microservices and event-driven architectures.
Strong database design and optimization experience, especially with MongoDB or Cassandra (or other distributed databases).
Proven problem-solving and ability to debug complex distributed systems.

Nice to Have

Experience with modern frontend frameworks like React.
Knowledge of OpenSearch.
Experience with message brokers such as Kafka or RabbitMQ.

About Sinch

Sinch is a technology company that builds communications solutions and platforms for messaging and contact-related experiences. The role focuses on backend engineering for Sinch’s Contacts Platform, involving scalable distributed systems, observability, and reliable service operations.