Senior Full Stack Engineer

August 31, 2026

Remote

Senior

Important before applying

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English is required · C1 level

Description

Rakuten Viber is hiring a Senior Full Stack Engineer to work on high-traffic applications with over 1 billion messages daily. The role involves developing scalable services using Node.js and Java, with a focus on microservices architecture.

Responsibilities

Planning, designing, developing and maintaining 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.
Debug, optimize, and performance-tune your work across the stack.

Requirements

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.

Node.jsJavaTypeScriptmessaging

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