Senior Full Stack Engineer

Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions.

We are a global team of engineers dedicated to creating the best tools to ensure safe, convenient, and fun communication for millions of users worldwide. Our culture is built on innovation, teamwork, and a commitment to excellence. We offer a unique opportunity to work with cutting-edge technologies, including microservices architecture, and influence the lives of millions of people.

As a Fullstack Developer at Viber , you will be involved in developing and maintaining high-traffic with over 1 billion messages a day and dozens of scalable services, ensuring the fast and reliable operation of our platform. Your tasks will include developing new features, optimizing performance, ensuring data security, and solving complex technical challenges within our microservices architecture, using a combination of Node.js and Java.

• A minimum of 7 years of experience as a Full Stack Developer, with at least 4 years specializing in Node.js

• Solid proficiency in JavaScript and TypeScript , with demonstrated experience using TypeScript-first frameworks (such as NestJS, Fastify, or Next.js).

• Prior experience with Java .

• Proven expertise in developing and scaling enterprise-level production systems within a microservices architecture .

• Practical knowledge of at least one major frontend framework, such as React or Angular .

• Familiarity with both relational and NoSQL database systems.

• Proven experience with REST API design and integration, including the implementation of effective caching strategies .

• Hands-on experience with Continuous Integration/Continuous Delivery (CI/CD) pipelines and containerization using Docker .

• Experience in developing and executing comprehensive unit and integration tests .

• Practical experience working with Agile methodologies in a fast-paced environment.

• Strong analytical skills and effective communication abilities, with fluency in written and spoken English .