Frontend Developer (Flutter)

Frontend Developer

Company

KAST

Conditions

1 day agoSenior Brazil Remote Full Time Frontend Jobs by KAST

KAST KAST enables global spending of stablecoins through payment cards connected to traditional merchant networks and ATMs worldwide. Series ARecently fundedCompany intelligence Hong Kong Funding history Series A ($80M) Seed ($10M) Seed ($10M) Investors Peak XV Partners HongShan Left Lane Capital Peak XV Partners (ex as Sequoia India & South East Asia) HongShan (ex Sequoia China) Projects Kast KAST Global Accounts Neobank KAST Earn Yield Aggregator KAST Crypto Cards Card KAST Business Neobank About KAST KAST lets users spend stablecoins at merchants worldwide through payment cards connected to traditional networks. The platform supports multiple stablecoins within a custodian wallet system. Users can create digital cards for immediate use with mobile payment systems or request physical cards in various tiers. The service operates in multiple countries to facilitate cross-border digital asset spending. View jobs by KAST

Skills

Authentication Defi Flutter Git Lending Rest Api Security Staking Swap Wallet

Candidate Availability

Remote · Brazil · Required Required and preferred rules are kept separate and reflect the wording in the original posting.

About the Role

You will build and own consumer-facing DeFi features in a mobile app, translating on-chain lending, swapping, and borrowing into clear mobile experiences. You will integrate backend services, manage wallet and transaction states, write maintainable tested code, review code, and help shape requirements into released features.

Requirements

• 2+ years of production mobile development with Flutter, or 3+ years owning shipped consumer apps
• Hands-on DeFi experience with on-chain protocols and concepts including collateral, LTV, health factor, and gas or network fees
• Flutter state management, navigation, clean architecture, and dependency injection
• REST API consumption, authentication tokens, and asynchronous multi-step transaction flows
• Mobile security practices including secure storage, sensitive-data handling, and MFA flows
• Git-based workflows, code review, and App Store or Play Store releases

Responsibilities

• Build and own consumer-facing DeFi features in the mobile app
• Translate DeFi concepts into clear and trustworthy mobile user experiences
• Integrate backend services and handle secure money-movement and transaction authorization flows
• Manage wallet signing and transaction states with robust error handling and user feedback
• Contribute to mobile architecture and shared component patterns
• Write testable and maintainable code and participate in code review and release quality
• Collaborate with product and design to turn requirements into shipped features

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