Senior Full Stack Engineer

Rakuten Viber

Full Stack Developer at Rakuten Viber involved in developing and maintaining high-traffic applications. Collaborating in a global team using cutting-edge technologies within a microservices architecture.

Posted 5/4/2026full-timeWarsaw • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies

AngularDockerJavaJavaScriptMicroservicesNext.jsNode.jsNoSQLReactTypeScript

About the role

Key responsibilities & impact

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

What you’ll need

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

Benefits

Comp & perks

Cutting-edge technologies
Team collaboration
Opportunities for continuous improvement

ATS Keywords

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Hard Skills & Tools

Full Stack DevelopmentNode.jsJavaScriptTypeScriptNestJSFastifyNext.jsJavaMicroservices ArchitectureREST API Design

Soft Skills

Analytical SkillsEffective CommunicationTeam CollaborationProblem SolvingContinuous ImprovementAdaptabilityAttention to DetailMotivationPresentation SkillsFluency in English