Senior Frontend Engineer, React / Next.js

We are recruiting for a Senior Frontend Engineer for a fast-growing consumer marketplace technology company in New York City. This is a high-impact frontend engineering role focused on rebuilding high-traffic customer-facing web experiences, improving performance, and helping set the frontend architecture and standards the team will use going forward. This is not a maintenance role. This is a strong opportunity for a senior frontend engineer who wants real ownership, modern React / Next.js work, and a path toward broader technical leadership. What You Will Do • Lead major frontend initiatives across high-traffic consumer web experiences • Build and improve modern web applications using React, Next.js, and TypeScript • Own frontend architecture decisions, reusable patterns, routing, data fetching, caching, and component structure • Improve Core Web Vitals, SEO, site speed, conversion, and overall user experience • Partner closely with Product, Design, Backend Engineering, and leadership • Help raise the technical bar through code reviews, standards, mentoring, and strong engineering judgment • Work in a product-focused engineering environment where quality, speed, and business impact all matter Must Have • 7+ years of production web application development experience • Strong React experience • Strong JavaScript / TypeScript experience • Experience with modern frontend architecture • Experience with Next.js, SSR, SPA, or similar modern web frameworks • Experience building high-traffic, consumer-facing, product-driven web applications • Ability to lead frontend projects from design through release • Strong understanding of performance, SEO, Core Web Vitals, testing, and maintainable code • Strong product sense and ability to work closely with Product and Design teams Preferred • Next.js App Router experience • Tailwind CSS experience • Playwright or frontend testing experience • Datadog or observability experience • Experience with Ruby on Rails, Node.js, AWS, Postgres, or MongoDB environments • CS degree or strong computer science fundamentals • Background with a high-caliber product company, engineering-driven company, or strong startup environment Additional Details • Location: New York, NY • Schedule: onsite Monday through Thursday, remote Friday • Compensation: $170K to $210K base salary plus equity • Relocation is open, but relocation assistance is not provided • Authorization: Candidates must be authorized to work in the United States without employer sponsorship now or in the future. This employer is unable to provide or transfer visa sponsorship for this position.