Backend Developer, Java

Rakuten Viber

full-time

Posted on: 9/21/2025

Origin: • 🇮🇱 Israel

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SeniorLead

AkkaCloudDockerGoJavaJavaScriptKubernetesMicroservicesMongoDBNode.jsNoSQLPythonRxJava

About the role

Develop and maintain high-availability Java applications that can be high-volume and low-latency.
Work on high-traffic systems handling over 1 billion messages a day and dozens of scalable services.
Develop new features, optimize performance, ensure data security, and solve complex technical challenges within a microservices architecture.
Use non-blocking and reactive approaches, Cloud services, and NoSQL databases.
Plan, design, define application objectives and functionality, and ensure designs conform with business goals.
Support continuous improvement, investigate alternatives and technologies, and present for architectural review.
Work closely with Product and Architects teams on large mission-critical systems in a highly motivated team.

At least 7 years of experience as a Backend Developer, with at least 3 years in Java.
Advanced knowledge of Java, from frameworks to libraries.
Experience in Async and/or reactive Java frameworks (such as Vertx, Rxjava, Akka).
Advanced knowledge of unit testing frameworks and mocking.
Knowledge of cloud technologies.
Experience with large scale NoSQL database (such as Couchbase, MongoDB).
Experience with microservices development based on Docker and Kubernetes.
Experience with Agile methodology.
Striving for new knowledge and skill improvement.
Fluent in written and spoken English (interviews are in English).
Excellent oral and written communication skills.
Higher technical education.
Advantage: Knowledge of C++.
Advantage: Experience with other server-side languages such as Node.js, Go, Python.
Advantage: Experience working with remote teams.