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Senior Frontend Developer
Location
Poland
Posted
101 days ago
Salary
0
Seniority
Senior
Job Description
Senior Frontend Developer
Stellartech Research Corporation
• Custom Component Development: Build and maintain a comprehensive internal component library covering 95%+ of the UI surface. • 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.
Job 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
- Familiarity with A/B testing and analytics event tracking
- Nice to have: Experience with Next.js and server-side rendering
- Familiarity with feature flagging tools.
Benefits
- Health: company-provided medical expense compensation.
- Balance: Flexible paid time off, you get 21 days of annual leave + 10 bank holidays.
- AI solutions: АІ subscription and other tools.
- Freedom: Flexible role based either remotely or hybrid from one of our offices in Cyprus, Poland.
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