Sr Software Engineer, Front End

United States Digital Space LLC; San Jose (CA); On-site; USD 150,000 - 190,000; Full time

Job summary

United States Digital Space LLC is a leading crypto exchange and the developer of Wallet, providing millions with crypto trading access and decentralized apps. The Fiat team builds money experiences across 100+ markets, including fiat deposits/withdrawals, Simple Buy/Sell, and Cards & Pay, with a Bay Area AI-Native Product & Engineering Center.

We’re seeking a front-end engineer who is data-driven, curious, and capable of building AI-assisted tooling.

Qualifications

• Strong CS fundamentals and frontend essentials.
• Proficiency in Mandarin Chinese is required to communicate effectively with APAC teams.
• Demonstrated ability to build AI-assisted tooling and data-driven features.

Responsibilities

• Own and ship the money experiences: fiat deposits/withdrawals, Simple Buy/Sell, Cards & Pay for onshore and offshore markets.
• Build AI-native engineering infrastructure: agent harnesses, reusable skills, E2E automation, evaluation pipelines.

Skills

TypeScript

React

Vite

Web performance

Web security

AI-assisted development

Problem solving

Data-driven

Instrumentation

Education

BS/MS in Computer Science or equivalent

Job description

Who We Are

At the company, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom. the company is a leading crypto exchange, and the developer of the company Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). the company is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves. Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er. the company is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products the company, the company Wallet, OKLink and more.

About the Opportunity

The Fiat team builds the money experiences of the company. 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 the company 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.

What You’ll Be Doing

• Own and ship the money experiences of the company — 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.

What We Look For In You

• 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.