Senior Frontend Engineer (React)

Wymagania: - 8+ years of experience writing production frontend code, with the last 3+ at a senior level in a scale-up/start-up environment. - Deep React and TypeScript experience, with strong opinions on state management and component architecture. - Solid web fundamentals: HTML semantics, modern CSS (Grid, Flexbox, container queries), browser rendering pipelines, and the network layer. - Accessibility expertise as a practitioner skill, capable of spotting WCAG issues during design reviews. - Fluency in web performance, measuring and optimizing Core Web Vitals on real products. - High testing maturity (unit, integration, and end-to-end tests). - Excellent written and spoken English communication skills. - Bonus points for: Experience with large-scale monorepos, background in logistics/marketplaces/B2B SaaS, contributing to design systems, embedding AI-assisted features, or a working knowledge of Go. O firmie: - Optiveum is a recruitment and consulting company created based on our 20-plus years of experience in HR & IT services. - We work for Clients located in Poland and abroad providing our local and international Candidates with Project-based or Permanent job opportunities in a remote or office-based model. Zakres obowiązków: - Plan and lead frontend development within your value team, collaborating closely with PMs, designers, and backend engineers. - Translate designs into production user interfaces that are accessible, performant, well-tested, and consistent with the rest of the product. - Build prototypes to put working code in front of customers when validating product ideas. - Own web performance on the surfaces you touch, ensuring excellent Core Web Vitals to boost conversion rates. - Champion accessibility across the platform (WCAG 2.2 AA is the baseline). - Contribute to architecture decisions that cross the frontend/backend line, including API boundaries and real-time updates. - Maintain shared standards across a React/TypeScript monorepo through code reviews and technical councils. - Mentor junior engineers and contribute to the evolution of the company's design system. Oferujemy: - Salary up to 7000 Euro per month - 100% remote from Poland - B2B contract signed directly with our Client - Start ASAP - Work with a modern tech stack (React, TypeScript, AWS, Snowflake, Figma, Claude Code, etc.) - A curious, collaborative, low-ego culture within a Great Place to Work certified environment