Software Engineer - Blockchain
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'll join the Blockchain Backend Infrastructure team and take a position in building and maintaining the blockchain management platform. You'll be instrumental in researching and integrating blockchain technologies into the platform, collaborating closely with foundations and developers to gain a deep understanding of blockchain protocols and on-chain projects, then applying that knowledge to implement new features. You'll focus equally on external protocol integration patterns and internal wallet infrastructure, serving as a technical bridge between raw on-chain capabilities and the wallet features delivered to customers.
Requirements
- 5+ years of backend development experience in modern languages (Go, Python, JavaScript/TypeScript)
- 3+ years of hands-on blockchain development experience
- Experience working on high-scale distributed systems
- Understanding of microservices architecture and API design
- Knowledge of consensus mechanisms, cryptographic primitives, and distributed systems
- Strong problem-solving skills and attention to detail
- Strong verbal and written communication skills and a collaborative mindset
- Experience building blockchain solutions for enterprise or institutional use cases
- Understanding of security best practices for smart contracts and blockchain systems
- Demonstrated ability to apply AI tools in day-to-day development
- Understanding of MPC, multi-signature wallets, or other advanced cryptographic techniques
- Bachelor's degree in Computer Science, Engineering, or a related field
- Experience with Docker, Kubernetes, and Helm
Responsibilities
- Implement modern backend applications and infrastructure in a microservices architecture using the latest technologies and development practices
- Deep dive into the latest blockchain technology and become an expert in the fundamentals, protocols, and features of the chains supported
- Collaborate effectively with developers, engineers, and other roles while demonstrating strong independent problem-solving abilities
- Contribute to production reliability through on-call participation, incident response, and post-incident follow-ups