New offer - be the first one to apply!

April 10, 2026

React Developer

Senior • Hybrid

130 - 160 PLN

Warsaw, Poland

🔸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!