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# Software Engineer - Wallets

- **Company:** RAIN, Inc
- **Location:** New York, NY, United States
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Cyber Security, Distributed Systems, Key Management, Blockchain
- **Published:** November 8, 2026
- **Apply:** https://www.juju.com/job/28_25304_e46659b0b9e16d6a5447cc4fe1be0d3e

## About the Role

* Deep expertise in one or more areas of wallet, custody, cryptography, or security infrastructure
 * Strong distributed systems and architecture fundamentals
 * Experience designing or building production wallet, custody, signing, or key management systems, particularly infrastructure securing high-value assets
 * Strong knowledge of applied cryptography, including MPC, threshold cryptography, threshold signatures, distributed key generation, ECDSA, EdDSA, or secure multiparty computation
 * Experience with HSMs, secure enclaves, TEEs, confidential computing, hardware-backed key isolation, or other security-critical infrastructure
 * Strong understanding of wallet and blockchain account architecture, including EOAs, smart contract wallets, account abstraction, ERC-4337, transaction orchestration, and multichain systems
 * Experience designing authentication, authorization, policy, permissions, recovery, or secrets-management systems where security and correctness are critical
 * Track record of making architectural decisions in complex distributed systems and evaluating security, reliability, developer experience, and extensibility tradeoffs
 * Ability to form strong technical opinions, communicate tradeoffs clearly, and own architecture from first principles through production
 * Able to work in a hybrid role and come into a NYC office 3 days a week
 * Legally authorized to work in the United States for any employer without restrictions
 * Four-year university graduation/degree information requested in the application form
 * Experience in fintech, payments, crypto, stablecoins, or blockchain requested in the application form, Demonstrates deep expertise in wallet architecture, custody, and cryptography, with a strong focus on designing secure and scalable systems for high-value asset management. Proficient in applied cryptography and distributed systems, ensuring robust security and developer-friendly infrastructure., * Applied Cryptography
 * Key Management Systems
 * Distributed Systems
 * Security Infrastructure, * Cryptography
 * MPC
 * Threshold Cryptography
 * ECDSA
 * EdDSA
 * Key Generation
 * Transaction Signing
 * Authorization
 * Account Abstraction
 * Multichain Systems

Soft Skills

 * Technical Communication
 * Decision-Making
 * Collaboration, * Fintech
 * Payments
 * Crypto
 * Stablecoins
 * Blockchain, * HSMs
 * Secure Enclaves
 * TEEs
 * Confidential Computing

## Description

* * Design secure, scalable systems for custody, key management, transaction signing, authorization, and recovery
 * * Design flexible signing infrastructure supporting MPC, HSMs, secure enclaves, TEEs, and emerging cryptographic approaches
 * * Build and evolve wallet systems across EOAs, smart contract wallets, account abstraction, ERC-4337, embedded wallets, and multichain infrastructure
 * * Define boundaries between cryptography and wallet orchestration, including keys, signing authority, transaction policies, permissions, and authorization
 * * Architect key management systems covering key generation, distributed key generation, storage, rotation, backup, recovery, and hardware-backed isolation
 * * Build highly available signing and transaction infrastructure controlling high-value customer assets while maintaining developer-friendly APIs
 * * Set technical direction for wallet security, including threat modeling, policy engines, secrets management, account recovery, authentication, and programmable authorization
 * * Make build-versus-buy decisions across cryptography, custody, wallet, and security infrastructure
 * * Ensure the architecture evolves alongside new blockchain standards and cryptographic techniques
 * * Collaborate within Rain's open, flat Engineering organization and influence the product roadmap and company vision