Senior Frontend Engineer I - eCommerce

Accountabilities

• Own key features and components across the eCommerce booking experience, including checkout, payments, appointment scheduling, sales-assisted booking, and partner booking flows.

• Build fast, accessible, responsive customer-facing experiences using React, Next.js App Router, and TypeScript.

• Collaborate with Product and Marketing teams to design, launch, and evaluate booking-funnel experiments, interpreting results carefully and distinguishing meaningful improvements from statistical noise.

• Contribute to frontend architecture decisions, including server and client component boundaries, data-fetching patterns, state management, and type-safe form validation.

• Integrate the booking platform with commerce APIs and third-party services such as Stripe, Affirm, commercetools, Voucherify, Salesforce, Auth0, and Google Maps.

• Instrument features with observability and analytics tools, including Datadog RUM, PostHog, and Google Tag Manager, while respecting customer consent and privacy preferences.

• Improve Core Web Vitals, rendering performance, and bundle size to optimize a high-traffic, revenue-critical customer journey.

• Make accessibility a core part of development through semantic markup, keyboard navigation, screen-reader support, and automated accessibility checks.

• Develop and maintain automated tests across component, integration, and end-to-end levels using tools such as Vitest, Testing Library, MSW, and Playwright.

• Take ownership of production outcomes by releasing features behind feature flags, monitoring performance and errors, and resolving issues after launch.

• Work closely with Product, Design, Marketing, and Backend Engineering to align requirements, define API contracts, and improve shared components.

• Contribute to technical discussions and code reviews, provide guidance to colleagues, and mentor junior engineers.

• Use AI-assisted development tools thoughtfully within structured workflows for implementation, review, and testing.

Requirements

• Typically 4 or more 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 routing, server-side rendering, and the tradeoffs between server and client rendering.

• Solid understanding of browser fundamentals, including semantic HTML, modern CSS, responsive layouts, the JavaScript event loop, networking, caching, and browser rendering.

• Experience with modern data-fetching and state-management approaches such as TanStack Query, Zustand, Redux, or equivalent tools.

• Experience building complex, validated, multi-step forms and transactional user journeys.

• Strong testing practices across unit, component, and end-to-end testing, using tools such as Vitest or Jest, Testing Library, and Playwright or Cypress.

• Experience developing checkout, payment, or other transactional flows where accuracy, security, and reliability are essential.

• Working knowledge of WCAG 2.1 AA accessibility standards and web performance optimization, including Core Web Vitals.

• Familiarity with frontend monitoring and product analytics tools such as Datadog RUM, Sentry, PostHog, or Google Analytics.

• Hands-on experience with modern CI/CD practices and cloud-hosting environments, such as GitHub Actions and AWS.

• Demonstrated ability to lead complex features from initial design through implementation, deployment, and ongoing production support.

• A proactive, adaptable mindset, with the ability to navigate ambiguity, seek input when needed, and balance delivery speed with engineering quality.

• Excellent communication and collaboration skills across engineering, design, product, and business teams.

• Additional experience that is a plus: Stripe.js and payment integrations, including buy-now-pay-later providers such as Affirm; headless commerce platforms such as commercetools; promotion engines such as Voucherify; Tailwind CSS; and design systems or component libraries.

• Other valuable experience: Consent management platforms such as OneTrust, privacy-conscious analytics, international products involving multiple currencies and locales, and accurate date and timezone handling.

• Growth and marketing experience is beneficial: Funnel optimization, rapid experimentation, acquisition and conversion metrics, event tracking, UTM and referral attribution, advertising conversion tracking, landing pages, email capture, referral programs, promotional codes, and abandoned-cart recovery.

• Familiarity with identity providers such as Auth0, scheduling or booking platforms, consumer healthcare applications, or highly regulated industries is an advantage.

• 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 now or in the future.

Benefits

• Base salary: $145,000–$170,000 in local currency, depending on experience and geographic location.

• Healthcare coverage: Comprehensive medical, dental, and vision benefits, including mental health coverage, to support employees and their families.

• Complimentary whole-body scans: Free whole-body scans for team members, supporting a proactive approach to personal health.

• Retirement savings: Access to a 401(k) plan for eligible employees, with pre-tax contributions. Employer matching contributions are not currently offered.

• Flexible time off: Flexible vacation policy, with encouragement to take time away to rest and recharge.

• Commuter benefits: Support for eligible transit and parking expenses through a commuter benefits plan.

• Professional growth: Opportunities to develop skills, take on new challenges, and shape an individual career path.

• Collaborative culture: Weekly team gatherings to connect, share ideas, and build relationships.

• Mission-driven work: The opportunity to contribute to technology designed to advance proactive healthcare and positively affect people's lives.