Senior Full Stack Engineer

Location: Warsaw, Poland (hybrid) (PL)

Description

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.

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.

Advantages

• Comprehensive understanding of message queues and event-driven architecture.
• Familiarity with essential AWS services, such as SQS, Lambda, and RDS.
• Proficiency in utilizing validation libraries like Zod or Yup.
• Experience with data-fetching libraries such as React Query or RTK Query.
• Experience collaborating within distributed, cross-functional team environments.
• A Bachelor of Science degree in Computer Science or a relevant equivalent qualification.

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Skills