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Web Fullstack Developer

R&D, Warsaw, Poland (hybrid), April 30 2025

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 communication for millions of users worldwide. Our culture is built on innovation, teamwork, and a commitment to excellence.

We’re looking for an experienced, highly motivated senior web fullstack developer to join our team. As such, you will be responsible for design and development of Viber features. We offer many interesting and challenging tasks that will allow you to extend your technical abilities delivering the product of the highest quality to our users.

Responsibilities

  • Implement new features and support the entire application lifecycle, including concept, design, test, release, and support phases
  • Strongly cooperate with our product and design teams to implement their vision and user experience into code
  • Contribute to building our engineering team: participate in technical reviews, architecture, design systems
  • Test your own code. You will debug, optimize, unit/regression/cross-platform test your work.

Requirements

  • At least 4 years of relevant work experience
  • Strong Angular, Angular-material, React knowledge
  • Strong knowledge in either of the following technologies: PHP or Node.js
  • Strong proficiency in JavaScript, TypeScript, HTML, CSS and SASS
  • Experience with REST APIs and integrating with backend services, understanding caching and offline storage
  • Knowledge of CI/CD pipelines and deployment processes. Experience with Docker
  • Ability to implement unit and end-to-end tests, experience in implementation of A/B tests
  • Experience with microservices development and architecture
  • Experience with Agile methodology
  • Fluent in written and spoken English
  • Excellent analytical and time management skills
  • Excellent spoken and written communication skills.

Advantages

  • Experience with other backend languages such as Go or Java
  • Experience with data-fetching libraries for web applications (RTK Query / React Query / etc.)
  • Experience with validation libraries (Zod / Yup / etc.)
  • Experience with react-hook-form or similar form management libraries
  • Experience with i18n
  • Experience with Redux-Saga
  • Advanced knowledge of unit testing frameworks and mocking
  • Experience with AWS cloud
  • Experience with Next.js
  • Experience working with distributed teams
  • B.Sc. in Computer Science or equivalent.

About

At Rakuten Viber, we connect people–no matter who they are, or where they are from. As a communication platform that connects hundreds of millions of people around the world, we know that the way people communicate changes on an almost daily basis. That’s why we dedicate ourselves to providing added value to communication — from private and group chats to audio and video calls to the ability to follow and contact brands, businesses and celebrities. Viber is an all-in-one platform for everything communications-based, and all Viber communications are protected by end-to-end encryption. Viber is part of the Rakuten Group, a world leader in e-commerce and financial services