Senior Frontend Developer (React/JavaScript)

We are looking for a Senior Frontend Developer (React/JavaScript) for our client, based in Kraków and surrounding areas.The project involves developing a large-scale communication platform in the travel industry that generates traveler documents and delivers time-critical notifications via email and SMS (over 1 million emails and approximately 100,000 SMS messages daily).The system is responsible for informing travelers about schedule changes, web check-in availability, and flight status (from 24 hours before departure up to the departure time), as well as collecting post-trip feedback.Build React/TypeScript UIs for template authoring, localization workflows, approvals and reporting dashboards.Collaborate with Product to deliver accessible, responsive and performant experiences for global audiences.Integrate front‑end with secure backend APIs; ensure state management, caching and error handling are robust.Write automated tests (unit/E2E) and contribute to component libraries/design systems.Proficient in React, TypeScript, HTML5/CSS3 and modern build tooling.Experience with testing frameworks and Git workflows.Strong attention to accessibility, internationalization and security best practices in the browser.Very good command of English (written and verbal)Nice to haveHands‑on with WYSIWYG editors, charting/visualization libraries and design system contributions.Performance profiling and optimization experience.Must possess a legal work permit in Poland General benefits - depends on the form of employment Hybrid work model combining office & remote workAttractively located office with collaboration spacesOnsite parking space for employees Referral program with financial bonus Life Insurance Budget for development (including language courses and others), clear career path with the possibility to gain experience in international environment Access to internal Learning Platform with multiple trainings oriented for professional growth Lifestyle benefits: Access to MyBenefit platform (Multisport included)Team Building activities Charity initiatives Working environment promoting diversity and inclusion Health benefits: Private medical care - Platinum Packag