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You'll collaborate closely with backend, product, and design to ship money-movement features that are secure and reliable.
Location: remote from Brazil.
- Department
- Engineering
- Employment Type
- Full Time
- Location
- Brazil
- 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
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What does a front-end developer in web3 do?
A front-end developer in web3 typically works on developing and building the user-facing part of applications that are built on blockchain technology
This can include tasks such as designing and implementing the user interface, using libraries like web3.js and Ethers.js, creating and maintaining the overall look and feel of the application, and ensuring that the app is accessible and easy to use for the end user
Front-end developers in web3 may also be responsible for integrating the application with the underlying blockchain network, as well as working with other members of the development team to create a seamless and intuitive user experience.