Senior Backend 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'll join the Liquidity Team to help build one of Fireblocks' newest fintech products. You'll act as a leading backend developer, mentoring and guiding other developers on complex designs while collaborating closely with other teams on cross-functional features. You'll connect exchanges, leading third-party trading agencies, and other providers to create a multi-functional trading platform. You'll also develop and optimize Fireblocks' trading API for a seamless and scalable experience, and research and implement cloud-native architectures to support ongoing growth and scalability.
Requirements
- At least 5 years of experience in backend development, with a focus on scalable infrastructure with proficiency in Node.js and TypeScript
- Strong understanding of system design principles, distributed systems, and scalability
- Proven track record of designing and deploying microservices-based architectures in production environments
- Experience with monitoring and logging frameworks (e.g., Datadog, Prometheus, Grafana, ELK stack)
- Solid understanding of blockchain fundamentals - transaction lifecycles, block confirmations, mempool mechanics, and finality across multiple chains (e.g., EVM-compatible chains, Solana, Bitcoin)
- Hands-on familiarity with DeFi protocols and primitives - including AMMs (e.g., Uniswap, Curve), liquidity pools, yield mechanisms, and on-chain order books
- Understanding of crypto liquidity concepts - market making, order routing, slippage, price impact, and the differences between CEX and DEX liquidity (nice to have)
Responsibilities
- Be a leading backend developer of one of the newest fintech products in Fireblocks
- Mentor and guide other developers in complex designs
- Work closely with other teams and lead meaningful cross functional features
- Connect exchanges, leading 3rd party trading agencies and other providers to create a multi-functional trading platform
- Develop and optimize Fireblocks' trading API to ensure a seamless and scalable experience for users
- Research and implement cloud-native architectures to support Fireblocks' ongoing growth and scalability