Senior Software Engineer, Developer Platform

Offchain - Senior Software Engineer, Developer Platform

The Role:

• The Developer Platform team builds KMS, the key-management and signing service behind ZeroDev's embedded wallets (smart-account / account-abstraction wallets that app developers drop into their products). It is non-custodial: end users control their keys, and the service orchestrates secure creation, authentication, and signing on top of a third-party signing provider. This is security-critical infrastructure, externally audited, with a high review bar. You will own backend services and the cryptographic recovery and trust-model machinery around them on a small, high-ownership team, and help grow the platform from interactive consumer wallets toward programmatic and automated signing and programmable transaction policy.

What you'll work on:

• Go backend services that broker wallet creation, authentication, and signing at scale.
• Key recovery and the committee trust model: distributed key generation and secret sharing that keep the service non-custodial, with recovery authority split across independent committees so no single party ever holds a user's key
• Trusted Execution Environments: reconstructing and operating on key material under hardware isolation and remote attestation
• Authentication and signing-provider integration: the user-facing auth methods that gate signing (passkeys / WebAuthn, OAuth, OTP, sessions, 2FA), and integrating with a third-party signing provider (authorization and policy flows, scoped credentials, quorum / consensus approvals)
• Security review and hardening: writing design docs and decision records, working directly with external security auditors, and turning a high review bar into shipped code
• Production operations on Kubernetes: observability and alerting, secrets and certificate management, on-call, and the compliance controls the domain requires (sanctions screening, PII-safe handling)

Who you are:

• A strong backend engineer who has shipped and operated production services in Go (or an adjacent systems language and is eager to go deep in Go)
• Security-first by default: you reason about threat models, blast radius, and key custody as a habit, and you write code that holds up to security-critical review
• Comfortable with applied-cryptography fundamentals (public-key crypto, signatures, key management). You do not need to be a cryptographer, but you can reason about it and learn fast
• Solid on distributed systems and API design: idempotency, failure modes, and clean service boundaries
• Operationally mature: Kubernetes, observability, and incident response are not foreign to you
• Clear written communicator (design docs, decision records) who thrives in a collaborative, review-heavy culture

Nice-to-have

• TEE experience (AWS Nitro Enclaves, Intel SGX / TDX, or similar): attestation, enclave key handling, reproducible enclave builds
• Threshold cryptography / MPC in practice: DKG, FROST or other threshold signatures, verifiable secret sharing, resharing
• Account abstraction: ERC-4337, EIP-7702, smart-account or embedded / non-custodial wallet experience
• Built on or integrated a custody / signing provider (Turnkey, Fireblocks, or similar), or built one
• HSM / YubiKey / PIV / secure-element integration
• Been on the receiving end of a third-party security audit and driven the remediation
• WebAuthn / passkeys, OAuth / OIDC, and the Go crypto ecosystem

Perks:

• Remote-first global workforce + NY office
• Annual company offsite + team onsites
• Professional reimbursement program (facilitates industry conference attendance, certifications, and more)
• Medical, dental & vision coverage (US + some other countries)
• 401k retirement plan + company match (US only)
• Wellness stipend
• Home office set up / ergonomic equipment program

Attention Offchain Job Seekers:

This role cannot be performed in California, or Colorado.

Please be advised that there has been a rise in fraudulent recruiter activities, particularly within the We