Senior Frontend Engineer II - eCommerce

About the role

Prenuvo is dedicated to transforming healthcare from reactive to proactive. Our award-winning whole body scan, which takes under an hour and is MRI-safe and non-invasive, is paired with advanced AI and a patient-centric approach. We are seeking a Senior Frontend Engineer to join our eCommerce team, focusing on enhancing the online booking platform to improve user experience, reduce booking friction, and drive growth through experimentation.

Responsibilities

• Optimize the User Experience: Identify and remove friction points in the booking flow, enhance page load performance, and ensure WCAG accessibility compliance across all flows.
• Drive Experimentation & Growth: Design, implement, and analyze A/B tests using tools like PostHog or DataDog. Implement feature flag infrastructure for gradual rollouts and track conversion metrics at each stage of the funnel.
• Owning Frontend Architecture: Build highly responsive interfaces using a hook-first architecture and modern state patterns (optimistic updates, single-flight request patterns).
• Ensure Reliability & Observability: Set up and maintain Datadog RUM dashboards, implement comprehensive error tracking, and debug production issues to maintain high system reliability.
• Champion Testing & Quality: Write and maintain robust end-to-end tests (Playwright) for critical booking flows and ensure high component test coverage (Vitest, React Testing Library).
• Implement Secure Integrations: Build secure authentication flows (Auth0, OAuth 2.0) and handle payment processing data (Stripe, Affirm) according to strict PCI and frontend security standards.
• Collaborate & Mentor: Work autonomously while surfacing blockers early. Mentor junior engineers, partner closely with Product and Design, and challenge product decisions using data.

Requirements

• 5+ years of professional frontend software engineering experience, with a deep understanding of React (React 19 preferred, including hooks and functional components).
• Strong proficiency in TypeScript (strict mode, generics, type safety).
• Solid experience with modern state management (Zustand, TanStack Query) and utility-first CSS (Tailwind).
• A strong track record of writing, maintaining, and debugging automated tests using Playwright, Vitest, and React Testing Library.
• Hands-on experience with monitoring and experimentation tooling (Datadog RUM, PostHog, or similar).
• A data-driven, user-focused mindset: you empathize with customer pain points and make decisions based on metrics rather than opinions.
• A strong "startup mentality": you are comfortable with ambiguity, know how to balance speed with quality, and take deep ownership of outcomes.
• Excellent communication skills, with the ability to explain complex technical concepts to non-technical stakeholders.

Qualifications

• Nice to Have: Experience with e-commerce, checkout flows, or headless commerce platforms (e.g., CommerceTools); Experience with design systems and mobile-first design implementation; Experience with component libraries (e.g., Material UI) and implementing mobile-first design systems; Deep performance optimization expertise (Core Web Vitals, bundle optimization); Knowledge of Google Tag Manager (GTM) and Google Analytics 4 (GA4); Experience with Next.js (App Router, SSR/SSG patterns); Familiarity with healthcare or heavily regulated industries.

Benefits

We offer:

• An avenue to make a positive impact on people's lives and their health
• Growth opportunities are at the heart of our people journey, we're doing big things with bright minds - there is no single path to success, it can be shaped along the way
• Building strong relationships is at the core of everything we do - our team gets together each week to connect, share, and socialize
• Recognizing time away to restore is vital to our wellbeing - we have a flexible vacation policy and we will encourage you to use it
• The Prenuvo's Commuter Benefits Plan to help cover your transit and parking costs
• A 401(k) retirement savings plan to eligible employees, allowing team members to make pre-tax contributions toward their retirement
• A comprehensive benefits package including health, dental, vision, including Mental Health coverage

Pay

$175,000 to $190,000 in local currency, depending on experience and geographic location

Schedule

Full-time