Senior Software Engineer, Developer Platform

You will join a small, high-ownership team building KMS, the key-management and signing service behind ZeroDev's embedded wallets. You'll own backend services and the cryptographic recovery and trust-model machinery around them, helping grow the platform from interactive consumer wallets toward programmatic and automated signing and programmable transaction policy. You'll work on security-critical, externally audited infrastructure with a high review bar, writing Go services, working with trusted execution environments, integrating authentication and signing providers, and operating production systems on Kubernetes.

Responsibilities

• Build Go backend services that broker wallet creation, authentication, and signing at scale
• Implement key recovery and the committee trust model using distributed key generation and secret sharing
• Operate trusted execution environments, reconstructing and operating on key material under hardware isolation and remote attestation
• Integrate authentication and signing-provider flows including passkeys, WebAuthn, OAuth, OTP, sessions, and 2FA
• Write design docs and decision records and work directly with external security auditors
• Operate production services on Kubernetes including observability, alerting, secrets and certificate management, and on-call
• Implement compliance controls such as 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 ability to reason about threat models, blast radius, and key custody
• Comfortable with applied-cryptography fundamentals such as public-key crypto, signatures, and key management
• Solid understanding of distributed systems and API design including idempotency and failure modes
• Operational maturity with Kubernetes, observability, and incident response
• Clear written communication skills for design docs and decision records
• TEE experience such as AWS Nitro Enclaves, Intel SGX/TDX, or similar is a plus
• Threshold cryptography or MPC experience such as DKG, FROST, or verifiable secret sharing is a plus
• Account abstraction experience such as ERC-4337, EIP-7702, or smart-account wallets is a plus
• Experience with custody or signing providers such as Turnkey or Fireblocks is a plus
• HSM, YubiKey, PIV, or secure-element integration experience is a plus
• Experience with third-party security audits and remediation is a plus
• Experience with WebAuthn, passkeys, OAuth/OIDC, and the Go crypto ecosystem is a plus

Benefits

• Remote-first global workforce + NY office
• Annual company offsite + team onsites
• Professional reimbursement program
• Medical, dental & vision coverage
• 401k retirement plan + company match
• Wellness stipend
• Home office set up / ergonomic equipment program