Full-stack Engineer - Wallets (NYC / MIA)

About the role

Crossmint Global is revolutionizing financial rails with its all-in-one stablecoin and wallet infrastructure platform. Trusted by over 40,000 clients, including global giants like MoneyGram and Paga, Crossmint powers billions of cross-border transactions and the world's first digital Universal Basic Income program.

Responsibilities

• Write high-quality production code that is correct, secure, performant, and maintainable.
• Build and scale wallet infrastructure components, including wallet creation, signing flows, transaction orchestration, and lifecycle management.
• Implement and evolve programmable wallet primitives, such as modular signers, delegated transaction logic, and permissions enforced onchain.
• Design scalable, secure systems that bridge onchain and offchain components while maintaining data integrity and compliance.
• Contribute to architecture and design documentation to shape the long-term evolution of Crossmint wallet products.
• Own features end-to-end from design to production deploy and iteration.
• Participate in paid on-call rotations once or twice per quarter.
• Mentor and support teammates to help grow the engineering organization.

Requirements

• Strong communication skills in written and spoken English.
• Bachelor's degree in Computer Science or equivalent professional experience.
• 5+ years building production systems, ideally with backend and full-stack responsibilities.
• Strong programming skills in at least one modern language such as TypeScript (Ideal), JavaScript, Java, Python, or similar.
• Experience with wallet infrastructure, transaction systems, or blockchain-related services.
• Solid understanding of blockchain fundamentals, including smart contract interactions, gas abstraction, and transaction lifecycles.
• A product and ownership mindset with an ability to balance usability, security, and long-term reliability.

Skills

• Familiarity with EVM ecosystems, Solana, or multi-chain support.
• Prior experience at a crypto-native or Web3 engineering team.
• Familiarity with secure key management and programmable permission systems.

Benefits

• Extensive access to leading AI tools and subscriptions.
• Unlimited, flexible PTO.
• Flexible work schedule.
• Company laptop and allowance for any necessary home equipment.
• Daily stipend for commuting to the office and/or meals.
• Three company-paid off-sites per year.
• Health, dental, vision, life, short-term disability (STD), and long-term disability (LTD) insurances.
• 401(k) Plan.