Software Engineer - Wallets

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.

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.

Unlimited time off 🌴 Unlimited vacation can be daunting, so we require Rainmakers to take 10 days minimum for themselves.

Flexible working ☕ We support a flexible workplace – work from home, come into an office, or both. We want everyone to work in an environment where they're their most confident and productive selves. New Rainmakers receive a stipend to set up a comfortable home workspace.