Software Engineer – Wallets

Jobtailor; New York (NY); Hybrid; USD 260,000 - 420,000; Full time

Job summary

Rain is seeking a Senior Wallet Architect to own the wallet infrastructure across custody, signing, and recovery. You will shape security policy, cryptographic choices, and multi-chain orchestration while maintaining scalable, developer-friendly APIs.

You will collaborate in a flat engineering culture, influence product direction, and work in a hybrid NYC-friendly role with focus on high-value asset protection and architectural rigor.

Qualifications

• Experience in wallet, custody, cryptography, or security infrastructure.
• Strong distributed systems and architecture fundamentals.
• Production wallet or key management system experience.
• Knowledge of MPC, threshold cryptography, or distributed key generation.
• Experience with high-value assets security.

Responsibilities

• Own the architecture of Rain's wallet infrastructure.
• Design secure, scalable systems for custody, key management, transaction signing, authorization, and recovery.
• Build and evolve wallet systems across EOAs, smart contract wallets, and multichain infrastructure.
• Define boundaries between cryptography and wallet orchestration, including keys, signing authority, and policies.
• Architect key management systems with generation, distribution, storage, rotation, backup, and recovery in hardware-backed isolation.
• Collaborate within Rain's open engineering organization and influence the product roadmap.

Skills

Wallet architecture

Cryptography

Distributed systems

Security infrastructure

Key management

Authentication/Authorization

Education

Four-year university degree

Tools

HSMs

Secure enclaves

TEEs

Confidential computing

Job description

• • Own the architecture of Rain's wallet infrastructure
• • 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

Requirements

• 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

Core Competencies

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.

Highest-signal resume keywords

• Wallet Architecture
• Applied Cryptography
• Key Management Systems
• Distributed Systems
• Security Infrastructure

ATS Optimization Keywords

Hard Skills

• Cryptography
• MPC
• Threshold Cryptography
• ECDSA
• EdDSA
• Key Generation
• Transaction Signing
• Authorization
• Account Abstraction
• Multichain Systems

Soft Skills

• Technical Communication
• Decision-Making
• Collaboration

Industry Keywords

• Fintech
• Payments
• Crypto
• Stablecoins
• Blockchain

Tools & Technologies

• HSMs
• Secure Enclaves
• TEEs
• Confidential Computing