Full-stack Engineer - Wallets; NYC​/MIA

Full-stack Engineer - Wallets (NYC / MIA)

Location:

NYC (preferred) or Miami. Hybrid office setting.

Type of employment:
Full-time

Salary range:
Mid level: 150, USD
Senior level: 185, USD

Note:

Final level, team assignment, and compensation are determined during the interview process based on experience and fit.

Crossmint is the leading enterprise-grade, all-in-one stablecoin infrastructure enabling fintechs and enterprises to integrate stablecoin rails and smart wallets with speed, compliance, and scale. Crossmint provides embedded smart wallets, on/offramps, cross-chain stablecoin orchestration, token checkout, and other blockchain primitives through simple, developer-friendly APIs, no blockchain engineers required. Backed by Ribbit Capital, Franklin Templeton, and other top investors. The future of finance is crypto-native.

Crossmint makes it easy to get there.

As a Full-stack Engineer on the Wallets Team, you will focus exclusively on building and scaling Crossmint’s wallet infrastructure and programmable wallet platform that enterprises and developers use to onboard users, manage assets, and power financial flows across blockchains. Your work will directly impact how companies integrate wallets that abstract private key complexity, gas mechanics, and blockchain interactions via secure APIs and SDKs.

You will help ship enterprise-grade wallet services that developers rely on for production-ready systems.

• 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.
• Build backend services, APIs, and frontend tools that empower developers to integrate Crossmint wallets and developer experiences at scale.
• 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.

To thrive in this role, you should have:

• Strong communication skills in written and spoken English.
• Bachelor’s degree in Computer Science or equivalent professional experience.
• 3 to 5+ years building production systems, ideally with backend and full-stack responsibilities.
• Strong programming skills in at least one modern language such as Type Script (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 life cycles.
• A product and ownership mindset with an ability to balance usability, security, and long-term reliability.

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

Please keep in mind:
This is the full list of everything we’re looking for. You don’t need to check every single box to be a strong candidate, and having a good number of these would already indicate a solid fit for the role.

• Stock options program.
• Two performance reviews annually addressing performance, bonuses, promotions, salary adjustments for inflation and market conditions.
• Unlimited, flexible PTO.
• Flexible work schedule.
• Company laptop and allowance for home equipment.
• Daily commuting stipend.
• Company-paid trips for annual off-sites and onsites.
• Health, dental, vision, life, STD and LTD insurances.
• 401(k) Plan.

• Results and delivery: Ship high quality work fast.
• Build for the long term: Build scalable,…