Software Engineer - Wallets

The role

You will own the architecture of wallet infrastructure, designing secure and scalable systems for custody, key management, and transaction signing. You will build wallet systems across multiple account models and set technical direction for wallet security.

What you will do

• Own the architecture of Rain’s wallet infrastructure
• Design flexible signing infrastructure for MPC, HSMs, secure enclaves, TEEs, and emerging cryptographic approaches
• Build and evolve wallet systems across multiple account models
• Define boundaries between cryptography and wallet orchestration
• Architect security-critical key management systems
• Build highly available signing and transaction infrastructure
• Set the technical direction for wallet security
• Make foundational build-vs.-buy decisions across cryptography, custody, wallet, and security infrastructure

Required qualifications

• 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
• Strong knowledge of applied cryptography, such as 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 modern 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
• A track record of making high-leverage architectural decisions in complex distributed systems

Benefits

• Unlimited time off (10 days minimum required)
• Flexible working
• Stipend to set up a home workspace
• For US Rainmakers, 95% of health, dental, and vision plan costs covered, and 90% for dependents
• 100% company-subsidized life insurance plan
• 401(k) with a 4% company match
• Equity option plan
• Monthly stipend for eligible health and wellness spending
• In-office meals via DoorDash credit
• Team and company offsites, both domestic and international

About the company

Rain is the global stablecoin payments platform for enterprises, neobanks, platforms, developers, and AI agents. The company provides secure, scalable infrastructure for moving, storing, and using stablecoins.