Staff Full Stack Engineer
Castle Island Ventures is a venture capital firm focused exclusively on public blockchains, investing in early-stage companies at the intersection of traditional finance and public blockchains.
About Castle Island Ventures
Castle Island Ventures is a venture capital firm focused exclusively on public blockchains. Their mission is to support entrepreneurs building the infrastructure and application companies required to help transformative blockchain protocols reach their full potential. They describe their focus as 'accelerating frictionless finance,' investing in early-stage companies operating at the intersection of traditional finance and public blockchains. The firm also produces a podcast and newsletter covering topics in this space, and maintains a portfolio of companies whose open roles are listed on their jobs board.
Skills
About the Role
You will design and implement rich frontend experiences and scalable backend services that power Fireblocks' wallet infrastructure through the Dynamic platform. You will own features across the stack, from technical design and architecture through implementation, testing, deployment, and ongoing optimization. You will build and maintain backend services and APIs supporting authentication, wallets, and payments infrastructure, and develop user-facing features and frontend tooling for both end-user and developer-facing applications. You will work closely with Product, Design, and other engineering teams to deliver robust, high-impact features, contribute to performance, reliability, and scalability improvements, and help uphold engineering best practices through code reviews, testing, documentation, and knowledge sharing.
Requirements
- 3–5 years of experience building and shipping production-grade, full-stack web applications
- Strong experience with React and TypeScript on the frontend
- Experience building backend systems and APIs using Node.js and frameworks such as Express
- Comfort working across frontend and backend systems in complex, evolving codebases
- A strong appreciation for clean, maintainable code and system performance
- Experience collaborating cross-functionally with product and design partners
- Curiosity about fintech and Web3, and interest in building infrastructure used at global scale
- Experience with blockchain technologies such as EVM chains, wallets, and on-chain integrations
- Solidity experience writing, deploying, testing, or interacting with smart contracts in production environments
- Experience maintaining, testing, and securing smart contract systems post-deployment
- Experience with a variety of state management solutions in production React applications
- Experience with security products or other high-sensitivity domains
Responsibilities
- Design and implement rich frontend experiences and scalable backend services
- Own features across the stack from technical design through deployment and optimization
- Build and maintain backend services and APIs supporting authentication, wallets, and payments infrastructure
- Develop user-facing features and frontend tooling for end-user and developer-facing applications
- Collaborate with Product, Design, and other engineering teams to deliver high-impact features
- Contribute to performance, reliability, and scalability improvements across the platform
- Uphold engineering best practices through code reviews, testing, and documentation
Benefits
- Target bonus
- Equity grant
- Generous benefits