Staff Frontend Engineer

About NewtonX

NewtonX is a B2B insights company trusted by the world's most innovative companies to make high-stakes decisions with confidence. We combine a verified network of business professionals with AI-powered research tools to deliver research intelligence faster, more precise, and more defensible than traditional methods.

Our clients include Google, Microsoft, TikTok, DoorDash, Stripe, and Coinbase. Our research has been cited by Fortune, Forbes, TechCrunch, Adweek, and the Wall Street Journal.

NewtonX has raised $47M from investors including Two Sigma Ventures, Third Prime, XFund, and Citi Ventures.

About The Role

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We are looking for a Staff Frontend Engineer with deep expertise in React and TypeScript. You’ll own the frontend architecture behind the data-dense applications our clients and research teams use every day, where performance, accessibility, and interaction quality are the product. This is a hands-on role: you’ll write production code, but your leverage comes from the systems and standards you leave behind.

What We’re Looking For

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• 6+ years engineering experience, mostly frontend, including 3+ at a senior level owning projects end-to-end
• Deep React expertise — hooks, composition patterns, and the ability to reason about rendering behavior rather than guess at it
• Strong TypeScript — typing that catches real bugs instead of decorating the code
• Expert JavaScript (ES6+), HTML, and CSS/SCSS, including the modern layout model
• Proven ownership of frontend architecture at scale: module boundaries, shared component libraries, and state management strategy
• Web performance as a discipline — Core Web Vitals, bundle analysis, code splitting, virtualization, and profiling with real tooling
• Accessibility fluency — WCAG 2.1 AA, semantic HTML, keyboard and focus management, screen reader testing
• Design system experience: reusable, themeable, doc