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# Software Engineer - Wallets

- **Company:** RAIN, Inc
- **Location:** United States (Remote available)
- **Salary:** $220,000.0 - $270,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Cyber Security, Distributed Systems, Key Management, Blockchain
- **Published:** September 4, 2026
- **Apply:** https://www.builtincolorado.com/job/software-engineer-wallets/11005604?handler=ApplyRedirect

## About the Role

* Deep expertise in one or more areas of wallet, custody, cryptography, or security infrastructure, combined with strong distributed systems and architecture fundamentals.
 * Experience designing or building production wallet, custody, signing, or key management systems, particularly infrastructure responsible for securing high-value assets.
 * 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 where security and correctness are critical.
 * A track record of making high-leverage architectural decisions in complex distributed systems, including evaluating tradeoffs across security, reliability, developer experience, and extensibility.
 * The ability to form strong technical opinions, communicate tradeoffs clearly, and own architecture from first principles through production, rather than simply integrating existing wallet or custody providers.

## Description

* Own the architecture of Rain's wallet infrastructure, designing secure, scalable systems for custody, key management, transaction signing, authorization, and recovery.
 * Design flexible signing infrastructure that can support MPC, HSMs, secure enclaves, TEEs, and emerging cryptographic approaches without creating fragmented systems.
 * Build and evolve wallet systems across multiple account models, including EOAs, smart contract wallets, account abstraction, ERC-4337, embedded wallets, and multichain infrastructure.
 * Define the boundaries between cryptography and wallet orchestration, including how keys, signing authority, transaction policies, permissions, and authorization interact across the platform.
 * Architect security-critical key management systems covering key generation, distributed key generation, storage, rotation, backup, recovery, and hardware-backed isolation.
 * Build highly available signing and transaction infrastructure capable of securely controlling high-value customer assets while maintaining reliable, developer-friendly APIs.
 * Set the technical direction for wallet security, including threat modeling, policy engines, secrets management, account recovery, authentication, and programmable authorization.
 * Make foundational build-vs.-buy decisions across cryptography, custody, wallet, and security infrastructure while ensuring the architecture can evolve alongside new blockchain standards and cryptographic techniques.


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