Job Duties: 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. Telecommuting permitted up to 1 day/week. ### Minimum Requirements: Bachelors 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, Web Developer, or related occupation. Alternatively, employer will accept a Masters degree or foreign equivalent and one year of experience in the job offered, or in a Software Engineer, Software Developer, Computer Programmer, Systems Analyst, Application Developer, Web Developer, or related occupation. Position requires at least one year of experience in the following: TypeScript: Designing scalable, production-grade full-stack applications and decentralized application interfaces, including high-performance React integrations. Developing resilient backend systems using Nestjs, APIs, and services, including blockchain data processing with Temporal workers, distributed task orchestration, and real-time event handling. Building, testing, and deploying Solidity smart contracts in production environments, ensuring compliance with security standards and gas optimization best practices. Designing and maintaining blockchain infrastructure components such as indexers, event listeners via webhooks, and data pipelines for hybrid on-chain/off-chain systems. Delivering highly reliable, maintainable production code with measurable improvements in scalability, uptime, and performance across distributed systems. * Designing and deploying monitoring, observability, and fault-tolerant solutions to ensure system resilience at scale. To apply, please visit https://crossmint.notion.site/Senior-Full-stack-Engineer-NYC-358c78fe43d880d88731e15dcbbc37c6 and click Apply for this job

Crossmint, Inc.

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Senior Full Stack Engineer