Senior Frontend Engineer - Jtx

Salary Range: 175000 to 195000 (Currency: USD) (Pay period: per-year-salary)

About the Position

You'll own the surface of JTX across web and mobile: order entry, market data, charts, positions, execution quality, onboarding, and the wallet flows underneath all of it.

The role suits a generalist with strong taste. You'll partner with design, product, and the infrastructure team, and you'll make architectural calls that stick for years. If you've spent time thinking about how markets actually work on Solana and want to build the product layer on top of that, this is the role.

Stack: React 19 + TypeScript on Next.js. Jotai + TanStack Query. Tailwind with a token-based design system. TradingView Advanced Charts on our own datafeed. Privy wallets. WebSockets to our engine. Web ships as a PWA; native mobile apps are in development.

What's Hard Right Now

Data freshness: several live WebSocket streams (order book, trades, candles, stats) feed many panels at once; keeping them fast, consistent with each other, and honest through async gaps (stale quotes, pending fills)
Performance: a data-dense terminal that stays smooth under constant streaming updates, including on mid-range hardware
Security: wallet signing, session auth, strict CSP, hardened supply chain
Shipping volume: three engineers own the entire surface of a live exchange; the backlog is bigger than the team, so throughput and prioritization are part of the job
Keeping product behavior and design language consistent between web and mobile while being very attentive to nuances of each mobile platform
Making execution quality something a trader can see in a glance instead of something they take on faith

What You'll Do

Build and own the JTX client across web and mobile
Ship real-time trading interfaces: order books, charts, order entry, positions, fill and execution visibility
Hit tight latency and render budgets against streaming market data, and decide what belongs on the client versus the server
Build wallet and signing flows, including self-custodial and embedded wallet onboarding
Own the shared component, state, and data layers the rest of the product team builds on
Make architectural decisions that hold as the codebase, the team, and the user base grow by an order of magnitude
Ship fast, watch real users, iterate

What We're Looking For

Attention to detail bordering on obsessive. You can look at a screen and say what is wrong with it, and it bothers you until it's fixed.
5+ years building production frontend, including something real-time, data dense, or financial
Deep React and TypeScript. You can explain why a component re-rendered and then fix it.
Mobile experience: React Native, Expo, or native iOS and Android
Strong fundamentals: browser performance, memory, websockets, network behavior under load
Security-first instincts around signing flows, key handling, and what should never touch a log
Comfortable in a codebase that is already live. You can refactor and clean up without stopping shipping.
Able to weigh business and engineering tradeoffs, and to explain complicated things simply

Relevant Background

If you have experience in any of the following, you may be a good fit:

Trading terminals, exchange or brokerage frontends

Consumer fintech apps at scale

Charting, time series, or high-frequency data visualization (canvas, WebGL)

Solana or EVM app development, wallet integrations, transaction signing

Maintaining a public TypeScript library or design system