Senior Frontend Engineer I - eCommerce

Prenuvo is a proactive healthcare company using whole-body scans, optimized technology, and increasingly AI to improve patient care. The Senior Frontend Engineer I will build and own complex features for the eCommerce booking experience, including product selection, checkout, payments, and scheduling, while improving conversion, accessibility, performance, and production reliability.

Responsibilities:

• Own features and components within an area of the booking experience, such as checkout and payments, scheduling, or the sales-assisted and partner flows, growing toward owning the area end to end
• Work with Product and Marketing on growth: ship experiments on the booking funnel, then read the results honestly, including sample size, guardrail metrics, and whether a change is a real win or just noise
• Build fast, accessible, customer-facing features with React, Next.js (App Router), and TypeScript
• Contribute to frontend architecture and design, writing proposals you review with senior engineers: sensible server and client component boundaries, server state with TanStack Query, client state with Zustand, and type-safe forms with React Hook Form and Zod
• Integrate the booking experience with our commerce APIs and third-party services, including Stripe, Affirm, commercetools, Voucherify, Salesforce, Auth0, and Google Maps
• Instrument what you ship: Datadog RUM for errors and performance, PostHog for product analytics, feature flags, and experiments, and Google Tag Manager for marketing measurement, all respecting each customer's consent choices
• Improve Core Web Vitals, bundle size, and rendering performance on a high-traffic, revenue-critical funnel
• Make accessibility a default: semantic markup, keyboard and screen reader support, and automated accessibility checks in CI
• Write automated tests at the right level: Vitest and Testing Library for components, MSW for API mocking, and Playwright for end-to-end booking flows
• Own outcomes in production: ship behind feature flags, watch the dashboards after release, and follow through when something breaks. You are accountable for whether a feature works for customers, not just whether it merged
• Partner closely with Product, Design, Marketing, and Backend engineers, contributing to our shared component library and agreeing the API contracts the frontend depends on
• Provide technical guidance through design discussions and high-quality code review, and mentor junior engineers
• Use AI-assisted development tools thoughtfully as part of a structured build, review, and test workflow

Requirements:

• Applicants must be legally authorized to work in the United States at the time of hire and must not require employer sponsorship for a work visa (current or future)
• Typically 4+ years of professional frontend engineering experience, including at least 3 years building production applications with React and TypeScript
• Strong experience with Next.js or a comparable React framework, including server-side rendering, routing, and the tradeoffs between server and client rendering
• Deep understanding of browser fundamentals: semantic HTML, modern CSS and responsive layout, the event loop, network and caching behavior, and the rendering pipeline
• Experience with modern data-fetching and state management patterns (TanStack Query, Zustand, Redux, or similar) and with complex, validated, multi-step forms
• Strong testing practices across unit, component, and end-to-end layers, using tools such as Vitest or Jest, Testing Library, and Playwright or Cypress
• Experience building checkout, payment, or other transactional flows where correctness and reliability matter
• Working knowledge of web accessibility (WCAG 2.1 AA) and web performance (Core Web Vitals)
• Experience with frontend observability and product analytics tools such as Datadog RUM, Sentry, PostHog, or Google Analytics
• Hands-on experience with modern CI/CD practices and cloud hosting (for example GitHub Actions and AWS)
• A track record of leading complex features from design through production
• A startup mindset: comfortable taking on ambiguous work, knowing when to pull in a second opinion on an approach, and able to balance speed with quality
• Excellent communication skills and the ability to collaborate across engineering, design, and business teams
• Experience with Stripe.js and payment method integrations, including buy now, pay later providers such as Affirm
• Experience with headless commerce platforms such as commercetools, or promotion engines such as Voucherify
• Experience with Tailwind CSS and building on top of a design system or component library
• Experience with consent management platforms (such as OneTrust), Google Tag Manager, and privacy-aware analytics
• Experience with multi-region products: multiple currencies and locales, and correct date, time, and timezone handling
• Growth engineering experience: working on a team that owns acquisition, activation, or conversion metrics, and shipping many small experiments quickly
• Experience with funnel analytics and marketing attribution: event tracking plans, UTM and referral attribution, and conversion tracking into ad platforms such as Google Ads and Meta
• Experience building growth surfaces such as landing pages, email capture, referral programs, promo codes, and abandoned-cart recovery
• Experience with authentication and identity providers such as Auth0
• Experience with scheduling, booking, or consumer healthcare applications, or working in highly regulated industries