Senior Full-stack Engineer

Crossmint

Senior Full Stack Engineer building APIs and distributed backend services at Crossmint. Working on payments systems, wallets, and decentralized applications in a fast-paced environment.

Posted 5/19/2026full-timeNew York City • New York • 🇺🇸 United StatesSenior💰 $150,000 - $200,000 per yearWebsite

Tech Stack

Tools & technologies

Distributed SystemsReactSolidityTypeScriptWeb3

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

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.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

TypeScriptReactNestjsSolidityAPIsblockchain data processingdistributed systemsmonitoring solutionsobservabilityfault-tolerant solutions

Soft Skills

mentoringcollaborationtechnical documentationcode reviewsperformance optimizationsecurityreliabilitymaintainabilityleadershipcommunication