Senior Software Engineer; Front End

Responsibilities

• 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
• 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

• Strong computer science fundamentals and frontend essentials — Type Script, React, modern tool chains (Vite), browser internals, and state management
• Depth beyond framework APIs
• 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
• Self‑driven and resilient: you learn faster than expected, push hard deliveries through to completion, and contribute beyond your own scope
• Proficiency in Mandarin Chinese is required to communicate effectively with our engineering and product teams across APAC
• Good sense of web performance, responsive design, and web security — you build experiences that are fast, adaptive across devices, and safe by default
• 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
• Sharp problem‑solving: you root‑cause ambiguous problems quickly and make sound calls with incomplete information
• 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