Responsibilities

Own the architecture of Rain’s custodial and non-custodial wallet infrastructure.
Design flexible signing infrastructure supporting MPC, HSMs, secure enclaves, TEEs, and emerging cryptographic approaches.
Build wallet systems supporting EOAs, smart contract wallets, account abstraction, ERC-4337, embedded wallets, and multichain infrastructure.
Architect key-management systems for generation, distributed generation, storage, rotation, backup, recovery, and hardware-backed isolation.
Build highly available signing and transaction infrastructure with reliable developer-facing APIs.
Set technical direction for wallet security, threat modeling, policy engines, secrets management, account recovery, authentication, and programmable authorization.
Make build-versus-buy and other foundational architecture decisions across cryptography, custody, wallet, and security infrastructure.

Requirements

Deep expertise in wallet, custody, cryptography, or security infrastructure, along with strong distributed-systems and architecture fundamentals.
Production experience designing or building wallet, custody, signing, or key-management systems that secure high-value assets.
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 comparable security-critical infrastructure.
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 communicate technical tradeoffs, form strong technical opinions, and own architecture from first principles through production.

Unlimited time off with a required minimum of 10 days taken annually.
Flexible work arrangement allowing employees to work from home, in an office, or in a combination of both.
Home-workspace setup stipend for new employees.
For US employees, Rain covers 95% of employee health, dental, and vision costs and 90% for dependents, plus fully subsidized life insurance.
401(k) plan with a 4% company match.
Equity option plan for every employee.
Monthly health and wellness stipend.
Free lunch and dinner for employees working from the office through DoorDash credit.
Domestic and international team and company offsites.