Sr Software Engineer, Front End

OKX•San Jose, CA

About The Position

The Fiat team builds the money experiences of OKX. Beyond the payment rails — fiat deposits, withdrawals, and payment methods across 100+ markets — we own Simple Buy/Sell, the front door to crypto for both onshore and offshore markets, and Cards & Pay, the products taking OKX into the money app category and giving customers a whole new reason to connect with us. We sit inside the Bay Area AI-Native Product & Engineering Center: we don't just use AI tools, we build agent harnesses, evaluation pipelines, and automation that lets a small team ship like a large one. We're looking for a front-end engineer who is sharp, curious, data-driven, and believes most "impossible" things simply haven't been automated yet.

Requirements

Strong computer science fundamentals and frontend essentials — TypeScript, React, modern toolchains (Vite), browser internals, and state management. Depth beyond framework APIs.
A good sense of web performance, responsive design, and web security — you build experiences that are fast, adaptive across devices, and safe by default.
Hands-on creativity with AI-assisted development: you've built things around models — agents, harnesses, MCP tools, eval loops, CI gates — not just used autocomplete.
Sharp problem-solving: you root-cause ambiguous problems quickly and make sound calls with incomplete information.
Self-driven and resilient: you learn faster than expected, push hard deliveries through to completion, and contribute beyond your own scope.
A conviction that decisions should be data-driven — and the willingness to get your hands dirty building the instrumentation and infrastructure when it doesn't exist yet.
BS/MS in Computer Science or a related field from a strong program, or equivalent evidence of exceptional ability.
Proficiency in Mandarin Chinese is required to communicate effectively with our engineering and product teams across APAC.

Nice To Haves

You've shipped developer tooling, design systems, or open-source work that other engineers adopted.
Familiarity with server-driven UI, module federation, or large-scale frontend library architecture.
E2E automation experience with Playwright — bonus points if you've taught an AI agent to write and maintain the tests for you.
Experience in payments, fintech, or trading products.

Responsibilities

Own and ship the money experiences of OKX — fiat deposit/withdraw, Simple Buy/Sell for onshore and offshore markets, and Cards & Pay —the surfaces used by millions of users.
Build AI-native engineering infrastructure: agent harnesses, reusable skills, E2E automation, and evaluation pipelines that multiply the whole team's output.
Make the product data-driven: instrument what you ship, build the tracking and experimentation foundations yourself when they don't exist, and let the numbers decide.
Drive frontend quality end-to-end — architecture, performance, testing, and server-driven UI systems that stay backward-compatible in production.
Work directly with product, design, and backend teams across the US and APAC to turn ambiguous requirements into shipped features.
Contribute tooling, patterns, and practices beyond your own team — what you build should raise the bar for the wider engineering group.