[Remote] Senior Software Engineer, Developer Platform

Note: The job is a remote job and is open to candidates in USA. Offchain is building blockchain scalability and security infrastructure for the Ethereum ecosystem through the Arbitrum stack. The Senior Software Engineer will own backend services and cryptographic recovery and trust-model infrastructure for a non-custodial key-management and signing platform, while contributing to security, authentication, distributed systems, and production operations.

Responsibilities

• 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
• 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)

Skills

• 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
• This role cannot be performed in California, or Colorado
• 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

Benefits

• Remote-first global workforce + NY office
• 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

Company Overview

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