Senior Full Stack Developer Needed

Senior Full Stack Developer (Fintech / Web3 Product) We are looking for a senior freelance developer to join an active digital product currently under development, focused on digital payments infrastructure, wallet experience, and blockchain-based transactional operations. The project already has a functional technical base and requires someone able to quickly understand an existing architecture, identify critical points, and contribute with solid technical solutions from both engineering and product perspectives. We are not looking for isolated task execution, but for strong technical judgment, scalability mindset, and the ability to solve real product challenges where frontend, transactional logic, and user experience are closely connected. Required Profile Proven senior experience building products with [login to view URL], React and TypeScript Strong understanding of modern frontend architecture, reusable components, and efficient state handling Real experience integrating blockchain logic on EVM-compatible networks Practical use of libraries such as Viem, ethers, or similar tools Ability to work on sensitive flows: balances, transfers, address validation, transaction states Experience debugging complex issues and improving production stability Strong coding standards focused on scalability and maintainability Strong Plus Previous work on real fintech products Experience with smart wallets or account abstraction Background in wallets, payment systems, digital onboarding, or advanced authentication flows Good product sense for financial UX simplicity Working Model Freelance collaboration by milestones Work on an existing codebase Clear communication and technical autonomy required We value fast problem-solving, precision, and ownership Important This project requires real senior-level experience. Profiles with proven participation in complex deployed or production-level products will be prioritized. If your background is mostly basic projects or learning-stage work, this opportunity may not be suitable at this stage.

Project ID: 40296033