Senior Frontend Engineer - JTX USA Engineering

About the Position:

• Own the surface of JTX across web and mobile: order entry, market data, charts, positions, execution quality, onboarding, and wallet flows.
• Partner with design, product, and infrastructure teams; make architectural calls that stick for years.
• Stack: React 19 + TypeScript on Next.js, Jotai, TanStack Query, Tailwind, TradingView Advanced Charts, Privy wallets, WebSockets.

What's Hard Right Now:

• Data freshness: manage live WebSocket streams for order book, trades, candles, stats; keep them fast and consistent.
• Performance: maintain a smooth, data-dense terminal under constant streaming updates on mid-range hardware.
• Security: handle wallet signing, session auth, strict CSP, and hardened supply chain.

What We're Looking For:

• 5+ years building production frontend, including real-time, data-dense, or financial applications.
• Deep React and TypeScript knowledge; mobile experience with React Native, Expo, or native platforms.
• Strong fundamentals in browser performance, websockets, and security-first instincts.
• Ability to weigh business and engineering tradeoffs and explain them simply.