Senior Frontend Engineer (React)

Senior Frontend Engineer Our Client is an ambitious tech company on a mission to create a frictionless shipping experience for SMEs. They wrap real-time pricing, comparison, booking, and tracking into a clean and unified interface, replacing outdated logistics processes with a seamless digital platform. Role We are looking for an experienced Senior Frontend Engineer to play a central role in shaping a web app where thousands of customers every week sign up, compare rates, manage integrations, and book shipments. You will work end-to-end—from understanding customer problems to shipping production code—while leading frontend work on a core value team (Customer Experience, Marketplace, or SaaS). Responsibilities • 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. Key competences • 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. Salary and Conditions • Salary up to 7000 Euro per month • 100% remote from Poland • B2B contract signed directly with our Client • Start ASAP Benefits • 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