{"schemaVersion":"jobsearcher.job.v1","id":"d8c22a241ed4c036e4e99158","url":"https://jobsearcher.com/jobs/d8c22a241ed4c036e4e99158","canonicalUrl":"https://jobsearcher.com/jobs/d8c22a241ed4c036e4e99158","title":"Frontend Developer (Flutter; DeFi)","description":"Frontend Developer (Flutter; DeFi)Department: EngineeringEmployment Type: Full TimeLocation: New YorkDescriptionWe'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.What You'll Be DoingBuild 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 Bring2+ 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 haveExperience 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.","company":"Kast","rawCompany":"kast","city":"Denver","state":"CO","isRemote":false,"isActive":false,"createdAt":"2026-09-11T13:00:05.831Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1254.00","title":"Web Developers","slug":"web-developers"},{"code":"15-1299.07","title":"Blockchain Engineers","slug":"blockchain-engineers"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Frontend Developer (Flutter; DeFi)","description":"Frontend Developer (Flutter; DeFi)Department: EngineeringEmployment Type: Full TimeLocation: New YorkDescriptionWe'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.What You'll Be DoingBuild 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 Bring2+ 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 haveExperience 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.","datePosted":"2026-09-11T13:00:05.831Z","dateModified":"2026-09-11T13:00:05.831Z","hiringOrganization":{"@type":"Organization","name":"Kast","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Denver","addressRegion":"CO","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"d8c22a241ed4c036e4e99158"},"url":"https://jobsearcher.com/jobs/d8c22a241ed4c036e4e99158"}}