Senior Front End Engineer

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Stellartech Research Corporation

WebsiteLinkedInAll Job Openings

51 - 200 employees

⚕️ Healthcare Insurance

🧬 Biotechnology

Healthcare Insurance • Manufacturing • Biotechnology

Stellartech Research Corporation is a world leader in the design, development, and contract manufacturing of sophisticated medical systems utilizing radiofrequency, ultrasound, and other energy sources. The company specializes in creating systems that combine disposable patient-contact devices with microprocessor-controlled instruments, incorporating complex electronics for sensor feedback and therapeutic energy delivery. Stellartech's expertise spans the development and manufacturing of diverse medical products, including diagnostic systems, surgical probes, and catheters for minimally invasive therapies. The company collaborates with businesses of all sizes, as well as entrepreneurs and physicians, to bring product ideas from concept to market introduction, providing resources and infrastructure as a partner throughout the process. With its extensive facility, Stellartech produces a wide array of Class II and Class III devices compliant with QSR and ISO 13485:2016 standards.

📋 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.