React Developer

35.45 - 43.63 USDNet per hour - B2B
JavaScript

React Developer

JavaScript
Żaryna, Warszawa

Billennium

Full-time
B2B
Senior
Hybrid
35.45 - 43.63 USD
Net per hour - B2B

Job description

🔸Important Note 🔸

Hybrid mode: 1 day per week in the office (Wednesday). Occasionally, there may be exceptions and a request to come to the office on another day.

Your notice period: maximum 1 month.


Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!


About the Client

Our client is a major player in the banking sector, developing modern digital platforms and frontend solutions used by multiple product teams. The role focuses on building reusable frontend components and platform-level solutions that support scalable product development across the organization.


What you will do

• Develop reusable frontend components and platform solutions such as shared NPM libraries and design system components

• Build and maintain scalable frontend applications using React, TypeScript, and modern JavaScript tooling

• Write and maintain unit and end-to-end tests ensuring high quality and reliability of delivered solutions

• Collaborate with designers, platform teams, and product teams to maintain consistency and usability across applications

• Provide technical support and guidance to other teams using shared frontend solutions

• Maintain technical documentation and contribute to improving frontend architecture and development practices


What we are looking for

• Strong experience with React, JavaScript, TypeScript, NPM, and modern CSS

• Experience building and maintaining scalable frontend applications and shared component libraries

• Solid experience with unit testing and e2e testing (e.g. Jest, Testing Library, Cypress)

• Strong knowledge of Git and version control workflows (branching, rebasing, commit management)

• Understanding of accessibility standards (WCAG / a11y) and ability to build accessible interfaces

• Experience working with Jira, Confluence, and Bitbucket

• Good English communication skills (minimum B2)


Nice to have

• Experience working with design systems and reusable UI component libraries

• Knowledge of microfrontend architecture• Experience with hybrid mobile applications (WebView, React Native, Capacitor, etc.)

• Familiarity with AI-assisted development tools or AI agents


Soft skills

• Attention to detail and commitment to delivering consistent, high-quality user interfaces

• Pragmatic, delivery-oriented mindset focused on achieving agreed outcomes

• Strong communication skills and ability to collaborate with designers, analysts, and developers

• Ability to work with documentation and follow established architecture guidelines


Perks and benefits

• Comprehensive benefits – enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers

• Flexibility – adaptable working hours and remote/hybrid work options to suit your lifestyle & location

• Career growth – access to professional development opportunities and partnerships with Microsoft, AWS, Snowflake, Salesforce & more

• Global collaboration – work with a diverse, international team

• Innovative environment – be part of a forward-thinking and growth-oriented workplace

• Engaging community – participate in team-building events, hackathons, and CSR initiatives

• A pleasant surprise to start your journey with us in the form of a welcome pack


Recruitment process

• HR call

• Technical interview

• Interview with the dedicated client

• Final decision / feedback


👉 Sounds interesting? Click “Apply” and let’s talk!

Tech stack

    Polish

    C1

    English

    B2

    React

    advanced

    JavaScript

    advanced

    TypeScript

    advanced

    CSS

    advanced

    Node Package Manager

    advanced

    Jest

    advanced

    Git

    advanced

    Cypress

    regular

Office location

Published: 05.03.2026

React Developer

35.45 - 43.63 USDNet per hour - B2B
Summary of the offer

React Developer

Żaryna, Warszawa
Billennium
35.45 - 43.63 USDNet per hour - B2B
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