Senior Full-stack Engineer

🕒 May 19

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Crossmint

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11 - 50 employees

Building the infrastructure layer to make NFTs mainstreamOur core product is the leading fiat on-ramp for NFTs, trusted by 5,000+ enterprises and creators, including Magic Eden, Sylvester Stallone, and Kevin Hart. We have a broader suite of APIs and developer tools, including minting APIs, custodial wallets as a service, and cross-chain payments

📋 Description

• 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.

🎯 Requirements

• 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, Web Developer, or related occupation. • We require 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. • 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.

🏖️ 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. • 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.