Senior Full Stack Engineer, Node.js

Rakuten Viber

. Plan, design, develop, and maintain high-availability, high-volume, low-latency applications .

Posted 9/18/2026full-timeWarsaw • PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing high-availability applications using Node.js and Java within a microservices architecture, while ensuring performance optimization and data security. Proficient in collaborating with cross-functional teams to align application designs with business objectives.

Highest-signal resume keywords

Full Stack DevelopmentNode.js ExpertiseMicroservices ArchitectureREST API DesignCI/CD Pipelines

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaScriptTypeScriptNestJSFastifyNext.jsJavaReactAngularRelational DatabasesNoSQL Databases

Soft Skills

Analytical SkillsEffective Communication

Tools & Technologies

DockerCI/CD Pipelines

Industry Keywords

High-Availability ApplicationsPerformance TuningAgile MethodologiesUnit TestingIntegration Testing

Tech Stack

Tools & technologies

AngularDockerJavaJavaScriptMicroservicesNext.jsNode.jsNoSQLReactTypeScript

About the role

Key responsibilities & impact

Plan, design, develop, and maintain high-availability, high-volume, low-latency applications
Define application objectives and functionality
Ensure application designs conform with business goals
Support continuous improvement by investigating alternatives and technologies and presenting them for architectural review
Collaborate closely with Product and Architects teams on large mission-critical systems
Debug, optimize, and performance-tune work across the stack
Develop and maintain high-traffic services handling over 1 billion messages per day
Develop new features, optimize performance, ensure data security, and solve technical challenges within a microservices architecture using Node.js and Java

Requirements

What you’ll need

Minimum of 7 years of experience as a Full Stack Developer
At least 4 years specializing in Node.js
Solid proficiency in JavaScript and TypeScript
Experience using TypeScript-first frameworks such as NestJS, Fastify, or Next.js
Prior experience with Java
Expertise 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 relational and NoSQL database systems
Experience with REST API design and integration, including caching strategies
Experience with CI/CD pipelines and Docker containerization
Experience developing and executing unit and integration tests
Experience working with Agile methodologies
Strong analytical skills and effective communication abilities
Fluency in written and spoken English

Benefits

Comp & perks

Hybrid work arrangement
Opportunity to influence hundreds of millions of users
Work with cutting-edge technologies, including microservices architecture
Opportunity to work with global engineering teams
Opportunity to work on mission-critical, high-traffic systems