Full-stack Engineer - Wallets (NYC / MIA)

Full-Stack Engineer

Crossmint is the leading enterprise-grade, all-in-one stablecoin and wallet infrastructure platform enabling fintechs and enterprises to integrate stablecoin rails and smart wallets with speed, compliance, and scale. Trusted by more than 40,000 clients including global leaders such as MoneyGram, WireX, Toku, and more, Crossmint provides embedded smart wallets, on/offramps, cross-chain stablecoin orchestration, tokenization, and other blockchain primitives through simple, developer-friendly APIs that integrate in minutes and scale to millions of users.

In January 2026, Crossmint secured MiCA authorization from Spain's CNMV, becoming one of a select few stablecoin infrastructure providers fully licensed to operate across all 27 EU member states and held to the same regulatory standards as traditional financial institutions. Crossmint also powers the Republic of the Marshall Islands' first digital UBI program, backs MoneyGram's new stablecoin cross-border experience launching in LATAM, and recently partnered with WireX to expand multichain stablecoin payment infrastructure to non-EVM networks like Stellar.

The future of finance is stablecoin-native. Crossmint makes it easy to get there.

Location

NYC (preferred) or Miami. Hybrid office setting.

Type of employment

Full-time

Salary range

Senior level: 185,000 - 200,000 USD

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

About the Role

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.

Responsibilities

You will:

• 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.

About you

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.
• 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.

Strong Plus If You Have

• 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.

Benefits

• Extensive access to leading AI tools and subscriptions, with AI actively encouraged and integrated into daily workflows.
• Stock options program.
• We conduct two performance reviews annually. The first addresses performance ratings, bonuses, and promotions. The second encompasses these elements along with salary adjustments reflecting inflation and market conditions.
• Unlimited, flexible PTO.
• Flexible work schedule.
• Company laptop and allowance for any necessary home equipment.
• Daily stipend for commuting to the office.
• Company-paid trips for annual off-sites and onsites.
• Insurance covered by Crossmint.
• 401(k) Plan.

Our Principles

• Results and delivery: Ship high quality work fast.
• Build for the long term: Build scalable, secure, and reliable solutions. Use AI.
• Extreme Ownership: Be an effective Directly Responsible Individual (DRI). Be proactive.
• Be a team player: Be an effective and kind colleague providing credible challenge. Be present and reliable.

Talent research indicates that women are often less inclined than men to apply for a role unless they have experience in 100% of the listed skills. However, this list is only a guide. We welcome your application even if you feel you meet around 75% of the requirements. At Crossmint, we believe skills can be learned, and diversity makes us stronger.

We work to foster a respectful environment where each person can be their authentic self, free from harassment, racism, and any form of discrimination. We proudly uphold our commitment to diversity and inclusion as an equal opportunity employer, and this policy applies to all employment practices within our organization.

Please note that Crossmint never conducts AI-based interviews, and all of our processes include an initial video call with a team member. Crossmint will not request your personal identification documents or any payment at any point during your interview process. Please stay vigilant about potential fraud. If you receive an email that claims to be from Crossmint but ends with any domain other than @crossmint.com, @crossmint.io, or @paella.dev, it is not from us. We own these three domains listed before, and they are the only legitimate ones.

Please let our Talent Team know if you need any assistance completing any forms, or participating in the process.

Who will be in contact with you

Our People Ops team will be joining you throughout the entirety of the interview and onboarding processes. Feel free to reach out if you need anything!

• Adolfo Fernández - Recruitment & People Ops

• Gloria Alogo - People Ops, Onboarding & Benefits

Please note that these are the only members of our People Ops team. Please remain vigilant and watch out for impersonators.