Lead Front-end Developer - E-commerce

This role is suitable for a Senior-level Lead Front-end Developer with 8+ years of front-end experience or a relevant degree plus experience, including at least 3 years leading or mentoring developers. The candidate should be skilled in HTML, CSS, JavaScript/TypeScript, React, Next.js, GraphQL, headless CMS or composable e-commerce platforms, accessibility, responsive design, Core Web Vitals, A/B testing, Git, and modern build or deployment tools. They should be familiar with architecting and delivering scalable e-commerce applications, leading cross-functional development, reviewing code, mentoring a remote team, improving performance and accessibility, and contributing to Agile planning and product experimentation.

How would you structure a scalable Next.js architecture for a large e-commerce platform?

I would separate reusable UI components, domain logic, data-access layers, and page-level composition, while defining clear boundaries between server and client components. I would also establish conventions for routing, state management, error handling, testing, and observability to support multiple teams and web properties.

When would you use server-side rendering, static generation, incremental static regeneration, or client-side rendering in Next.js?

Static generation and ISR are ideal for stable catalog and content pages, while server-side rendering is useful for frequently changing or personalized data. Client-side rendering should be limited to highly interactive features that do not need to block initial page display.

How would you design efficient GraphQL data fetching for composable e-commerce and headless CMS platforms?

I would define focused queries and fragments, avoid over-fetching, and use caching, pagination, batching, and persisted queries where appropriate. I would also handle loading, partial data, errors, and schema changes consistently through a typed client and well-defined data-access layer.

What techniques would you use to improve Core Web Vitals on an e-commerce site?

I would optimize LCP through responsive image formats, prioritized critical assets, server rendering, and efficient font loading. To improve INP and CLS, I would reduce JavaScript work, split bundles, reserve layout space, avoid unnecessary re-renders, and monitor performance with real-user data.

How would you ensure WCAG 2.1 Level AA compliance in a React application?

I would use semantic HTML, keyboard-accessible interactions, visible focus states, proper labels, sufficient color contrast, meaningful alternative text, and appropriate ARIA only when necessary. Automated tools would be combined with keyboard testing, screen-reader testing, and accessibility checks during design and code review.

How would you implement and evaluate an A/B test for an e-commerce feature?

I would define a measurable hypothesis and primary success metric, then assign users consistently while minimizing performance and flicker. After validating statistical significance and segment behavior, I would review guardrail metrics such as conversion quality, revenue, accessibility, and page performance before recommending rollout.

How would you manage state in a complex Next.js shopping experience?

I would keep local UI state in components, use URL state for shareable filters and navigation, and use a dedicated client-state solution only for cross-component concerns such as cart or checkout state. Server-owned data should remain cached and synchronized through the data-fetching layer rather than duplicated unnecessarily in client state.

What would your code review and front-end quality standards include?

Reviews should evaluate correctness, maintainability, accessibility, performance, security, test coverage, and consistency with established architecture. I would support these standards with TypeScript, linting, formatting, automated tests, CI checks, documented patterns, and constructive review feedback.

How would you approach responsive design and cross-browser compatibility for an e-commerce site?

I would use a mobile-first layout system with flexible grids, responsive typography, and tested breakpoints based on content needs rather than specific devices. I would validate behavior across supported browsers using automated and real-device testing, with progressive enhancement and graceful fallbacks for unsupported features.

How would you lead and mentor a remote front-end team of three developers?

I would establish clear ownership, shared technical standards, regular one-on-ones, and lightweight written documentation to support asynchronous collaboration. I would combine pairing, workshops, architecture discussions, and actionable feedback with delivery metrics that emphasize quality and sustainable team growth.

iFIT is a leading health and fitness technology company creating personalized, immersive experiences across physical fitness, nutrition, mental health, and recovery. As Lead Front-End Developer, E-Commerce, you will lead a remote US team, shape web architecture, and deliver fast, accessible, responsive e-commerce experiences for NordicTrack.com and other web properties. You’ll work with React, Next.js, TypeScript, GraphQL, headless CMS and composable commerce platforms, while driving accessibility, Core Web Vitals, A/B testing, coding standards, and developer growth. This remote role offers $120,000–$140,000 USD and the opportunity to influence a high-impact global platform while leading a talented engineering team.