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Frontend Developer - React

Sii Polska — Poland · Posted ~1 hour ago

Senior

Skills

ReactJS JavaScript React Hooks Context API CSS-in-JS or SCSS responsive design SOLID principles CI/CD frontend build processes CSS-in-JS SCSS

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Summary ✨ AI‑Generated

Join an international engineering team as an experienced Frontend Developer and help modernize a complex web application. You will build React and JavaScript interfaces, refactor legacy components, implement responsive styling, collaborate with backend specialists, participate in code reviews, and improve frontend delivery workflows.

Highlights

International team environment with a chance to modernize a complex application, work closely with frontend and backend specialists, improve architecture, and contribute to CI/CD and development practices.

Description

Join the dynamic international team of professionals split between London and Warsaw. We are looking for an experienced Frontend Developer to help modernize the user interface of a complex pricing application used for structured notes. The role involves working closely with both frontend and backend developers as we uplift the existing UI while maintaining compatibility with the legacy application. Your tasks Developing and maintaining user interface components using ReactJS and JavaScriptCollaborating with backend developers and strategists to implement featuresRefactoring legacy UI components to align with the new architectureUtilizing CSS-in-JS or SCSS for styling and implementing responsive designsParticipating in code reviews and applying SOLID design patternsContributing to improving CI/CD workflows and frontend build processes Requirements Minimum of 5 years of commercial frontend development experienceStrong knowledge of ReactJS (including Hooks and Context API) and JavaScriptPractical experience with TypeScript with proficiency in modern CSS techniques and toolsFamiliarity with modern frontend tooling: webpack, npm, GitLab/JenkinsUnderstanding of testing methodologies and software design principlesFluency in English (spoken and written)Open to hybrid work (3 days per week in the office) Job no. JOB-KZCK6 Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws. Benefits For You Great Place to WorkSolid financial situationContracts with the biggest brandsCentre of internal trainingsMany experts you can learn fromOpen and accessible management teamProfit sharingPassion Sponsorship programRegular integration events and tripsComfortable and well-equipped officesMySii appMedical care