Kast
Flutter Developer
Singapore1w ago
KAST is redefining what it means to bank with stablecoins - think Revolut, rebuilt from scratch on Web3. Backed by top-tier VCs, we’ve grown from 0 to 1 million users in under a year. We’re building the next-gen global bank based entirely on stablecoins.
Design is at the heart of everything we do - it’s how we simplify the complex, make money feel easy, and turn crypto skeptics into brand ambassadors.
KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-nativebusinesses, and high-inflation markets seeking USD-backed banking. We’re building the world’sfirst truly global money app including crypto cards, local accounts, and global payouts in apremium product with top acceptance rates.Backed by leading investors and led by the former APAC CEO of Circle, our team bringsexperience from Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and top OTC desks. SinceJuly 2024, we’ve scaled from zero to nearly a million users, becoming the go-to card for thecrypto community.By building directly on-chain, we offer what traditional financial rails can’t: instant yield, flexiblecollateralized 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 tooutpace legacy players. Our ambition is clear: to build the next generation of financial services andmake KAST the #1 stablecoin bank globally.
The Flutter Developer plays a key role in building and scaling KAST. This is a high-ownershipposition where you’ll take responsibility for meaningful work from day one, collaborate closely withcross-functional teams, and help turn ambitious goals into real-world outcomes.Your mission is to move fast and raise the bar. You’ll operate in a dynamic, high-growthenvironment, navigate ambiguity with confidence, and contribute to systems, products, orprocesses that scale with the company. Quality matters, speed matters, and ownership is non-negotiable.This role is for builders, people who take initiative, think in systems, and care deeply about doinggreat work. If you’re excited about working at the intersection of technology, execution, andimpact, you’ll feel right at home at KAST.
What You’ll Be Doing Overlook Flutter development of KAST’s consumer app for iOS and Android. Develop and maintain scalable, high-performance mobile applications. Collaborate with product, design, and QA teams to define and ship new features. Ensure app performance, quality, and responsiveness. Write clean, maintainable, and efficient code. Troubleshoot and solve complex technical challenges. Stay current with the latest mobile technologies and Flutter updates. Ensure compliance with App Store and Google Play guidelines for app submissions. What You'll Bring 2+ years of relevant experience in mobile development with Flutter and Dart. Proven experience leading teams and mentoring developers. Familiarity with RESTful APIs, mobile design patterns, and mobile-specific features for iOS and Android. Solid understanding of the mobile development lifecycle and app release processes. Experience with Git or similar version control systems. Knowledge of native Android and iOS development. Experience with Firebase, GraphQL, or other backend-as-a-service platforms. Familiarity with CI/CD tools and mobile app analytics. Experience working in Agile environments. Strong communication, problem-solving, and leadership skills. Web3 experience is a big plus. 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.
At this time, we receive a lot of applications, so please bear with us to hear back from us.
We hire through referrals, networks, and direct applications. Bring your skills, energy, and curiosity!
Send your resume or LinkedIn profile and a short note on why you want to join the ride to careers@kastcard.com