Front-end Engineer - Freelance/Service Agreement - Poland-based

Open to B2B contractors based in Poland. Rate: 89—119 PLN/hour. We are looking for a skilled Front-end Engineer for service agreement collaboration to cooperate with a team dedicated to automating and streamlining FlixTrain's operations - building internal tools that help manage the fleet more effectively, reduce manual processes, and increase productivity. This is a greenfield environment with plenty of room to shape new products from the ground up and explore innovative solutions for our internal users. Scope of services Independent development and delivery of high-quality frontend features within a self-organized, cross-functional distributed teamBuilding intuitive, responsive user interfaces with a focus on internal user experienceDriving frontend architecture decisions and contributing to technical quality across teams through code reviews and collaborationWorking with a modern tech stack: React, TypeScript, Vite with Module Federation, TanStack Router & Query, Zustand, Tailwind CSS, React Hook Form with Zod, Vitest, Storybook, React Testing Library, and BiomeRelevant expertise Relevant expertise Profound understanding of Typescript and its ecosystem (package managers, bundlers, linters, etc.)Extensive knowledge of HTML and CSSHands-on experience with React.jsExperience writing tests and working with test runners such as Jest or Vitest, including UI/e2e testingSolid written and spoken English skillsExperience working in an Agile setup Collaboration model Cooperation based on a service agreement with independent delivery of agreed services and invoicing