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Crossmint

Full-stack Engineer - Wallets

New York City (preferred) or Miami (Hybrid)Full-timeGlobal

šŸ’° USD 150,000 - 200,000/yr

šŸ“Š MidšŸ  Hybrid

Job Description

[AI-summarized by JobStash]

You will focus on building and scaling wallet infrastructure and programmable wallet primitives that onboard users, manage assets, and power financial flows. You will implement secure signing flows and transaction orchestration, build backend services, APIs and developer-facing tools, design onchain/offchain integrations, own features end-to-end, participate in paid on-call rotations, and mentor teammates.

Requirements

  • ā—Strong communication skills in written and spoken English
  • ā—Bachelor's degree in Computer Science or equivalent professional experience
  • ā—3 to 5+ years building production systems with backend and full-stack responsibilities
  • ā—Strong programming skills in at least one modern language such as TypeScript, JavaScript, Java, or Python
  • ā—Experience with wallet infrastructure, transaction systems, or blockchain-related services
  • ā—Solid understanding of blockchain fundamentals including smart contract interactions, gas abstraction, and transaction lifecycles
  • ā—Product and ownership mindset with ability to balance usability, security, and long-term reliability
  • ā—Familiarity with EVM ecosystems, Solana, or multi-chain support (strong plus)
  • ā—Experience designing hybrid onchain/offchain wallet systems (strong plus)
  • ā—Familiarity with secure key management and programmable permission systems (strong plus)
  • ā—Prior experience at a crypto-native or Web3 engineering team (strong plus)

Responsibilities

  • ā—Write high-quality production code that is correct, secure, performant, and maintainable
  • ā—Build and scale wallet infrastructure components including wallet creation, signing flows, transaction orchestration, and lifecycle management
  • ā—Implement and evolve programmable wallet primitives such as modular signers, delegated transaction logic, and onchain-enforced permissions
  • ā—Build backend services, APIs, and frontend tools to enable developer integrations at scale
  • ā—Design scalable, secure systems that bridge onchain and offchain components while maintaining data integrity and compliance
  • ā—Contribute to architecture and design documentation
  • ā—Own features end to end from design to production deploy and iteration
  • ā—Participate in paid on-call rotations
  • ā—Mentor and support teammates

Benefits & Perks

  • ā—Stock options program
  • ā—Two performance reviews annually covering ratings, bonuses, promotions and salary adjustments
  • ā—Unlimited flexible PTO
  • ā—Flexible work schedule
  • ā—Company laptop and allowance for home equipment
  • ā—Daily commuting stipend
  • ā—Company-paid trips for annual off-sites and onsites
  • ā—Health, dental, vision, life, short term disability and long term disability insurances
  • ā—401(k) plan

Tech Stack

Pythonmulti-chainSolanaOffchainwallet infrastructurekey managementAPITransaction flowJava
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