KAST

Frontend Developer (Flutter/DeFi)

In short

This role builds and owns consumer-facing DeFi features for a mobile app, covering lending, swaps, borrowing, wallet integration, and secure transaction flows. The company is a product company working in DeFi, and the position requires 2+ years of production Flutter development (or 3+ years shipping consumer apps) plus hands-on experience with on-chain protocols, mobile security, and clean architecture. Remote position restricted to Brazil.

About the Role
You will build and own consumer-facing DeFi features for a mobile application. You will turn lending, swap, and borrowing concepts into clear mobile experiences, integrate backend services, manage wallet and transaction states, and contribute to tested, maintainable code and release quality.
Requirements
•2+ years of production mobile development with Flutter or 3+ years owning shipped consumer applications
•Hands-on DeFi experience with on-chain protocols such as lending, borrowing, staking, swaps, or wallets
•Knowledge of collateral, LTV, health factor, and gas or network fees
•Flutter state management, navigation, clean architecture, and dependency injection
•Experience with REST APIs, authentication tokens, and asynchronous transaction flows
•Knowledge of mobile security practices, secure storage, sensitive-data handling, and MFA flows
•Experience with Git workflows, code review, and App Store or Play Store releases
Responsibilities
•Build and own consumer-facing DeFi features in the mobile application
•Translate DeFi concepts into clear and trustworthy mobile user experiences
•Integrate backend services and implement secure transaction authorization flows
•Manage wallet signing and transaction states with robust error handling and user feedback
•Contribute to tested mobile architecture and shared component patterns
•Write maintainable code and participate in code reviews and release quality
•Collaborate with product and design to deliver features

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