Senior Full-stack Engineer; NYC

Senior Full-stack Engineer (NYC)

Location:

New York City

Type of employment:
Full-time, hybrid setting. Telecommuting permitted up to 1 day/week.

Salary range:
Senior level: 150, USD.

Note:

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

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.

• Design and deliver secure, scalable crypto and Web3 systems, with deep ownership of payments infrastructure, digital wallets, minting frameworks, and decentralized applications.
• Build advanced APIs, distributed backend services, and complex front‑end interfaces that drive next‑generation user experiences across blockchain‑enabled products.
• Lead 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.
• Establish technical standards for full‑stack development, promoting best practices around performance optimization, security, reliability and maintainability.
• Mentor junior and mid‑level engineers through code reviews, technical deep dives and informal coaching to elevate overall team expertise.
• Optimize production systems by profiling and debugging large‑scale distributed applications, improving system performance and enabling higher throughput and availability.
• Write technical documentation and contribute to knowledge‑sharing efforts to support rapid scaling and long‑term sustainability of the codebase.
• Drive end‑to‑end technical design reviews and make critical architectural decisions that balance scalability, security and long‑term maintainability across multiple products.
• Conduct in‑depth performance profiling, threat modeling and security audits of decentralized applications and smart contracts to ensure robustness at scale.

• Bachelor’s degree or foreign equivalent in Computer Science or a related field, and three years of experience in a Software Engineering or related occupation.
• Alternatively, a Master’s degree or foreign equivalent and one year of experience.
• At least one year of experience in Type Script, NestJS, APIs, blockchain data processing, Solidity smart contracts, blockchain infrastructure components (indexers, event listeners, data pipelines), distributed systems reliability, monitoring and observability.
• Design and deploy monitoring, observability and fault‑tolerant solutions to ensure system resilience at scale.
• Deliver highly reliable, maintainable production code with measurable improvements in scalability, uptime and performance across distributed systems.

• Access to leading AI tools and subscriptions, with AI actively encouraged and integrated into daily workflows.
• Stock options program.
• Two performance reviews annually.
• Unlimited, flexible PTO.
• Flexible work schedule.
• Company laptop and allowance for necessary home equipment.
• Daily stipend for commuting to the office.
• Company‑paid trips for annual off‑sites and on‑sites.
• Insurance covered by Crossmint.
• 401(k) Plan.

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