Senior Full Stack Developer Needed
Budget: $250 – $750 USD
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 Next.js, 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.
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 Next.js, 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.