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We're looking for a mid-level to senior Flutter engineer who understands DeFi — not just how to build a beautiful mobile app, but how DeFi products (lending, staking, swaps, savings, and self-custody wallets) actually work on-chain. You'll build consumer-facing DeFi products end to end, translating complex on-chain flows into interfaces that are clear, trustworthy, and delightful.
You'll collaborate closely with backend, product, and design to ship money-movement features that are secure and reliable.
Location: remote from the US.
You'll collaborate closely with backend, product, and design to ship money-movement features that are secure and reliable.
Location: remote from the US.
- Department
- Engineering
- Employment Type
- Full Time
- Location
- New York
- Workplace type
- Fully remote
What You’ll Be Doing
- Build and own consumer-facing DeFi features in the KAST mobile app, end to end.
- Translate DeFi concepts (lending, swap, borrowing) into clear, trustworthy mobile UX.
- Integrate with backend services and handle secure, multi-step money-movement and transaction authorization flows.
- Handle wallet, signing, and transaction states — pending, submitted, confirmed, failed — with robust error handling and user feedback.
- Contribute to a clean, well-tested mobile architecture and shared component patterns.
- Write testable, maintainable code and participate in code review and release quality.
- Collaborate with product and design to shape requirements into shipped features.
What You'll Bring
- 2+ years of production mobile development with Flutter, or 3+ years with ownership of shipped consumer apps.
- Hands-on DeFi experience is required — you have built, integrated, or worked closely with on-chain protocols (lending/borrowing, staking, swaps, or wallets) and understand concepts like collateral, LTV, health factor, and gas/network fees.
- Strong command of Flutter fundamentals: state management, navigation, clean architecture, and dependency injection.
- Experience consuming REST APIs, handling auth tokens, and managing complex asynchronous and multi-step transaction flows.
- Solid understanding of mobile security best practices (secure storage, sensitive data handling, MFA flows).
- Comfortable with Git-based workflows, code review, and shipping to the App Store / Play Store.
Nice to have
- Experience integrating with DeFi lending, staking, or swap protocols on any major chain.
- Familiarity with embedded/MPC wallet providers or self-custody / key import-export flows.
- Experience in fintech, neobanking, or regulated financial products.
- Exposure to mobile analytics/observability and CI/CD.
- Contributions to shared Flutter packages or a modular multi-app codebase.
About KAST
KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-native businesses, and high-inflation markets hungry for USD-backed banking. Backed by top-tier global investors and led by the ex-APAC CEO of Circle, our leadership team spans Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and leading OTC desks. We’ve scaled from zero to nearly a million users at ridiculous speed.
Apply Now
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How do I get a job at DeFi?
Getting a job in the DeFi (decentralized finance) industry can be a competitive process, but there are a few steps you can take to increase your chances of finding a job in this field:
- Build up your skills and knowledge: To work in DeFi, you'll likely need to have a strong understanding of blockchain technology, as well as other related technologies such as smart contracts and cryptocurrency. Consider taking online courses or earning a degree in a relevant field to build up your skills and knowledge.
- Network with industry professionals: Attend meetups and conferences related to DeFi and make connections with professionals in the industry. Networking can be a valuable way to learn about job openings and get your foot in the door at a DeFi company.
- Create a strong online presence: Many DeFi companies will look at your online presence (such as your LinkedIn profile and personal website) when considering you for a job. Make sure to showcase your skills and accomplishments online and keep your profile up to date.
- Apply for relevant job openings: Keep an eye out for job openings at DeFi companies and apply for positions that align with your skills and experience. Apply for DeFi Jobs without Experience. Tailor your resume and cover letter to the specific job you're applying for and highlight any relevant experience or skills you have.
- Consider internships or volunteer work: DeFi Internships or volunteer work can be a great way to get your foot in the door and gain valuable experience in the DeFi industry. Many companies also offer internships to students, so consider applying for an internship if you're still in school.
- Be persistent: keep trying if you don't get a job right away. It can take time to find the right opportunity, but with the right skills and determination, you can land a job in the DeFi industry.