Senior Front End Engineer

Description

• Custom Component Development: Build and maintain a comprehensive internal component library covering 95%+ of the UI surface. Components are built from scratch without third-party libraries (no MUI, Chakra, Ant Design, etc.), with clean APIs and clear documentation. Collaborate with designers to deliver functional, brand-aligned implementations. • Marketing Funnel Engineering: Architect and develop multi-step marketing funnels, including landing pages, lead capture flows, upsell sequences, and thank-you pages. Implement dynamic content rendering, conditional logic, and form validation. Integrate with marketing platforms via REST APIs and manage funnel state across steps using appropriate storage strategies. • Payment Integrations: Integrate payment gateways (Stripe, PayPal, or similar) into funnel flows, including secure form handling, webhook processing, and error recovery. • Performance Optimization: Own Core Web Vitals across all funnel pages targeting Lighthouse scores of 95+. Apply code splitting, lazy loading, tree shaking, and critical CSS. Use React DevTools Profiler and Chrome Performance panel to identify and eliminate redundant re-renders through memo, useMemo, useCallback, and smart component splitting.

Requirements

• 5+ years of professional React development experience • Proven track record building 90%+ custom UI without component libraries • Understanding of the Critical Rendering Path • Deep understanding of React reconciliation, the virtual DOM, and rendering behavior • Experience with state management solutions (Redux Toolkit, Zustand, Jotai) and knowing when to use global vs local state • Solid understanding of Local Storage, Session Storage, and cookies — including security implications and appropriate use cases within funnel flows • Hands-on experience with React DevTools Profiler and techniques to prevent redundant re-renders • Experience integrating payment gateways (Stripe, PayPal, or similar) in production • Strong command of HTML5, CSS3, and modern TypeScript. • Nice to have: Experience with Next.js and server-side rendering • Familiarity with feature flagging tools • Familiarity with A/B testing and analytics event tracking.

Benefits

• Health: company-provided medical expense compensation. • AI solutions: АІ subscription and other tools. • Balance: Flexible paid time off, you get 21 days of annual leave + 10 bank holidays.

Copyright © ReadingWaters 2026.