Backend Developer, Java

Rakuten Viber

full-time

Posted on: 9/21/2025

Origin: • 🇧🇾 Belarus

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SeniorLead

AkkaCloudDockerGoJavaJavaScriptKubernetesMicroservicesMongoDBNode.jsNoSQLPythonRxJava

About the role

Planning, designing, developing and maintaining Java high-availability applications that can be high-volume and low-latency.
Define application objectives and functionality.
Ensure application designs conform with business goals.
Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review.
Work in a highly motivated team, closely with Product and Architects teams on large mission-critical systems.
Develop and maintain high-traffic systems (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 microservices architecture using Java, non-blocking/reactive approaches, Cloud services, and NoSQL databases.

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.
Advantages: Knowledge of C++. Experience with other server-side languages such as Node.js, Go, Python. Experience working with remote teams.