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Jumpcrypto📍 Remote | $150k - $200k |
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 an Solana developer do?
As a Solana developer, your responsibilities would include designing, implementing, and maintaining applications on the Solana blockchain platform using Rust programming language
This would involve using the Solana software development kit (SDK) to write smart contracts and build decentralized applications (dApps) that make use of the platform's features and capabilities
You would also be responsible for ensuring that your dApps are secure, efficient, and scalable, and for testing and debugging your code to ensure its correct behavior
Additionally, you may be involved in the ongoing development and improvement of the Solana platform itself, working with other members of the Solana community to drive innovation and advance the state of blockchain technology.