What You'll Do

• Design and implement multi-chain transaction infrastructure, including smart contract escrow and multi-chain settlement orchestration
• Build and maintain integrations with blockchain networks and node providers, primarily EVM chains (Base is our current primary) with future expansion to non-EVM
• Develop secure wallet infrastructure supporting institutional custody and compliance requirements
• Implement and maintain Coinbax Controls with integrations into third-party service providers such as Chainalysis, Circle, and more
• Evaluate and integrate multi-party computation (MPC) wallet solutions and cryptographic infrastructure
• Monitor protocol changes across supported chains and guide architectural decisions accordingly

What You Bring

• 5+ years of software development experience with strong Solidity proficiency; TypeScript for backend services and integration
• 2+ years of hands-on blockchain development—smart contracts, chain integrations, or wallet infrastructure
• Experience with EVM chains (Base, Ethereum); non-EVM experience (Solana, etc.) a plus
• Understanding of consensus mechanisms, transaction lifecycles, and gas optimization
• Familiarity with institutional requirements: security, auditability, compliance
• Comfort operating in an early-stage environment with ambiguity and rapid iteration

Nice to Have

• Smart contract audit development or experience
• Experience with stablecoin protocols or payment systems
• Understanding of MPC, multi-sig, or advanced custody solutions
• Background in fintech or financial services
• Experience with GCP, Docker, and CI/CD pipelines

Why Coinbax

At Coinbax, we're building the trust layer that enables banks and financial institutions to use programmable money with the same confidence they have in traditional systems. Our approach combines the speed of blockchain with the controls institutions require.

You'll work alongside a small, technical team solving hard problems at the intersection of traditional finance and blockchain infrastructure.

This is an opportunity to shape the architecture of institutional payment rails from the ground up, with direct impact on product decisions and technical strategy.