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# Senior Software Engineer, Developer Platform

- **Company:** REMOTE
- **Location:** San Francisco, CA, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** User Authentication, Software Design Documents, Distributed Systems, Key Management, OAuth, SSL Certificate Management, Backend, Kubernetes, Api Design
- **Published:** November 7, 2026
- **Apply:** https://www.juju.com/job/28_25303_a0115830ade74eede19eebb48acf4979

## About the Role

* 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

## Description

* 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)