Senior Software Engineer, Developer Platform

Join Offchain's Developer Platform team to build KMS, the key-management and signing service behind ZeroDev's embedded wallets. Own backend services, cryptographic recovery and trust-model machinery, authentication and signing integrations, and production operations for externally audited infrastructure.

Responsibilities

• Build Go backend services for wallet creation, authentication, and signing at scale.
• Implement key recovery and committee trust models using distributed key generation and secret sharing.
• Operate trusted execution environments with hardware isolation and remote attestation.
• Integrate passkeys, WebAuthn, OAuth, OTP, sessions, 2FA, and third-party signing providers.
• Write design documents and decision records and work with external security auditors.
• Operate Kubernetes production systems, including observability, alerting, secrets, certificates, on-call, and compliance controls.
• Implement sanctions screening and PII-safe handling.

Requirements

• Strong backend engineering experience shipping and operating production services in Go or an adjacent systems language.
• Security-first mindset with experience reasoning about threat models, blast radius, and key custody.
• Applied cryptography fundamentals including public-key cryptography, signatures, and key management.
• Distributed systems and API design knowledge, including idempotency, failure modes, and service boundaries.
• Operational maturity with Kubernetes, observability, and incident response.
• Clear written communication skills for design documents and decision records.
• TEE experience is a plus.
• Threshold cryptography or MPC experience is a plus.
• Account abstraction and smart-account wallet experience is a plus.
• Custody or signing-provider experience is a plus.
• HSM, YubiKey, PIV, or secure-element integration experience is a plus.
• Third-party security audit and remediation experience is a plus.
• WebAuthn, passkeys, OAuth/OIDC, and Go crypto ecosystem experience is a plus.

Benefits

• Remote-first global workforce with NY office
• Annual company offsite and team onsites
• Professional reimbursement program
• Medical, dental, and vision coverage
• 401k retirement plan with company match
• Wellness stipend
• Home office setup and ergonomic equipment program