Senior Fullstack Engineer NYC

New York City · Hybrid Senior Full-stack Engineer (NYC) About Crossmint 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. Backed by Ribbit Capital, Franklin Templeton, NYCA, First Round, and Lightspeed Faction, with $23.6M raised in 2025. 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 New York City Type of employment Full-time, hybrid setting. Telecommuting permitted up to 1 day/week. Salary range Senior level: 150,000 - 200,000 USD Note: Final level, team assignment, and compensation are determined during the interview process based on experience and fit. About the Role We're looking for a Senior Full Stack Engineer to own critical pieces of our Web3 infrastructure, from payments systems and digital wallets to minting frameworks and decentralized applications. You'll work across the entire stack, building advanced APIs, distributed backend services, and front-end interfaces that power next-generation blockchain products. If you want high ownership, hard infrastructure problems, and a seat at the table for technical direction, this is the role. What You Will Do Designing and delivering secure, scalable crypto and Web3 systems, with deep ownership of payments infrastructure, digital wallets, minting frameworks, and decentralized applications. Building advanced APIs, distributed backend services, and complex front-end interfaces that drive next-generation user experiences across blockchain-enabled products. Leading architectural decision-making for new features and core systems, collaborating with Product and Engineering teams to align design choices with long-term technical and business strategies. Establishing technical standards for full stack development, promoting best practices around performance optimization, security, reliability, and maintainability. Mentoring junior and mid-level engineers through code reviews, technical deep dives, and informal coaching to elevate overall team expertise. Optimizing production systems by profiling and debugging large-scale distributed applications, improving system performance, and enabling higher throughput and availability. Writing technical documentation and contributing to knowledge-sharing efforts to support rapid scaling and long-term sustainability of the codebase. Driving end-to-end technical design reviews and making critical architectural decisions that balance scalability, security, and long-term maintainability across multiple products. Conducting in-depth performance profiling, threat modeling, and security audits of decentralized applications and smart contracts to ensure robustness at scale. What We Are Looking For Must-haves Bachelor’s degree or foreign equivalent in Computer Science or a related field, and three years of experience in the job offered, or in a Software Engineer, Software Developer, Computer Programmer, Systems Analyst, Application Developer, We...