Senior Web Engineer

About KAST

KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-native businesses, and high-inflation markets seeking USD-backed banking. We're building the world's first truly global money app including crypto cards, local accounts, and global payouts in a premium product with top acceptance rates.

Backed by leading investors and led by the former APAC CEO of Circle, our team brings experience from Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and top OTC desks. Since July 2024, we've scaled from zero to nearly a million users, becoming the go-to card for the crypto community.

By building directly on-chain, we offer what traditional financial rails can't: instant yield, flexible collateralized lending, and enhanced investment products. Our cards bring stablecoins to life: spend at 100M+ merchants, withdraw at ATMs, and enable new ways to access credit.

Our culture is velocity × excellence. We move fast, obsess over product quality, and aim to outpace legacy players. Our ambition is clear: to build the next generation of financial services and make KAST the #1 stablecoin bank globally.

The Role

The Senior Web Engineer is the technical owner of KAST's public web presence. The role brings our marketing web stack fully in-house, migrating the site from Webflow to Next.js + Sanity and owning it long-term - architecture, build, integrations, SEO, performance, and day-to-day operations.

This role is for builders, people who take initiative, think in systems, and care deeply about doing great work. If you're excited about working at the intersection of technology, execution, and impact, you'll feel right at home at KAST.

Responsibilities:

• Build and own the new Next.js + Sanity site, including a template system that lets Marketing and Content publish without dev support.
• Lead the Webflow>Sanity migration without breaking URLs, SEO equity, or analytics.
• Ship campaign and product landing pages from Figma to production — build, QA, deploy, monitor.
• Operate the web infrastructure: DNS, SSL, redirects, Cloudflare, and edge Workers.
• Integrate the site with third-party systems (FX/currency API, lead capture, Pinpoint ATS, CRM, analytics).
• Own SEO, Core Web Vitals, accessibility (WCAG AA), and analytics.
• Run the website intake queue and keep stakeholders aligned across time zones.
• Own reliability: uptime, monitoring, and launch-day fixes.

Qualifications:

• 6+ years of Strong production experience with Next.js / React.
• Hands-on with a headless CMS, Sanity strongly preferred (schemas, editor experience, publishing).
• Track record migrating marketing sites without losing SEO, URLs, or analytics.
• Solid web infrastructure skills: DNS, SSL, redirects, CDN, Cloudflare, edge Workers.
• Ability to build lightweight back-end integrations (route handlers, serverless functions, webhooks).
• Strong technical SEO, performance, and accessibility (WCAG AA) knowledge.
• Self-directed operator who can own a site solo and ship fast across distributed time zones.

Nice to have

• Experience in fintech, crypto, or stablecoin/neobank products.

Why KAST

Work at the forefront of crypto, payments, and fintech. At KAST, you'll have high ownership, zero bureaucracy, and a direct impact on building the world's first truly global stablecoin-first bank.

Join a no-BS, high-energy team solving complex problems in a fast-paced environment. Every role matters, and your work will shape how people move money, manage digital assets, and experience financial products worldwide.

We offer competitive compensation, meaningful equity, and opportunities to grow as the company scales. Our high-trust culture gives you autonomy, responsibility, and the chance to build something extraordinary from the ground up.

How To Apply

Send your resume mentioning the post you are applying in the subject line [Confidential Information]