Callsign is hiring a Software Engineer (Orchestration) to design, build, and maintain components of our highly transactional Java platform. This on-site role in Abu Dhabi, United Arab Emirates, offers the opportunity to work in an Agile, fast-paced environment, collaborating with cross-functional teams to deliver secure, scalable software from development through deployment. You will design, develop, test, and maintain Java-based services and APIs, write clean, testable, and maintainable code following engineering best practices, participate in code reviews, perform end-to-end testing, and support production deployments. You will also identify and address technical debt and performance bottlenecks. Requirements include 3–6 years of commercial Java development experience, strong knowledge of Java (8+/17+), Spring Boot, RESTful APIs, relational databases (PostgreSQL/MySQL/Oracle) and SQL, familiarity with DynamoDB or other NoSQL databases, Docker, Linux, CI/CD, understanding of OOP and SOLID, and experience with orchestration and workflow patterns (Saga, Process Manager, state machines), microservices architecture, Redis, Kafka, and secure coding practices. Nice-to-have: observability tools (Prometheus, Grafana, ELK, OpenTelemetry), message queues (Kafka, RabbitMQ), basic knowledge of Kubernetes, AWS or Terraform, startup experience, crypto practices, distributed system patterns like Circuit Breaker, Idempotency and Outbox, reactive programming (Spring WebFlux / Project Reactor) or Java Virtual Threads, and applied cryptography. We offer private premium health insurance, visa

Callsign is hiring a Software Engineer (Orchestration) to design, build, and maintain components of our highly transactional Java platform. This on-site role in Abu Dhabi, United Arab Emirates, offers the opportunity to work in an Agile, fast-paced environment, collaborating with cross-functional teams to deliver secure, scalable software from development through deployment. You will design, develop, test, and maintain Java-based services and APIs, write clean, testable, and maintainable code following engineering best practices, participate in code reviews, perform end-to-end testing, and support production deployments. You will also identify and address technical debt and performance bottlenecks. Requirements include 3–6 years of commercial Java development experience, strong knowledge of Java (8+/17+), Spring Boot, RESTful APIs, relational databases (PostgreSQL/MySQL/Oracle) and SQL, familiarity with DynamoDB or other NoSQL databases, Docker, Linux, CI/CD, understanding of OOP and SOLID, and experience with orchestration and workflow patterns (Saga, Process Manager, state machines), microservices architecture, Redis, Kafka, and secure coding practices. Nice-to-have: observability tools (Prometheus, Grafana, ELK, OpenTelemetry), message queues (Kafka, RabbitMQ), basic knowledge of Kubernetes, AWS or Terraform, startup experience, crypto practices, distributed system patterns like Circuit Breaker, Idempotency and Outbox, reactive programming (Spring WebFlux / Project Reactor) or Java Virtual Threads, and applied cryptography. We offer private premium health insurance, visa