Senior Backend Engineer

Role Description

As a Backend Engineer at Moonshot, you’ll own some of the most critical systems in our stack:

• Identity and access
• Funds movement and ledgering
• Blockchain infrastructure that powers our on-chain trading

This role is similar to staff engineers at leading crypto wallets and exchanges who own authentication stacks, key management, and high-scale financial backends. You’ll design, build, and operate systems that must be both highly reliable and extremely secure, enabling product teams to move quickly on a solid foundation.

What You’ll Do:

• Design, build, and operate Identity & Access Management services:
  • Authentication flows, sessions, device trust
  • Authorization and entitlements (roles, permissions, policies)
  • Security controls such as MFA and key management (working with security teams)
• Own financial operations systems:
  • Transfers and payments orchestration
  • Ledgering and reconciliation flows
  • Limits, risk controls, and transactional correctness
• Build and maintain blockchain infrastructure:
  • Node and RPC management
  • Transaction submission, monitoring, and retry logic
  • Indexing and streaming of on-chain data into internal services and data stores
• Define and uphold reliability and observability standards:
  • SLOs and error budgets for core services
  • Dashboards, alerts, runbooks, and incident management practices
• Lead large, cross-functional technical projects from design through rollout, collaborating with Product, Security, and Ops
• Mentor and guide other engineers, contributing to engineering standards, design reviews, and documentation
• Stay close to industry best practices in auth, key management, and secure infrastructure for crypto and trading

Qualifications

• 5–12+ years of backend or product or platform engineering, including experience with high-scale, high-availability systems in fintech, crypto, or similar domains
• Deep expertise in at least one of:
  • Identity & access / security engineering
  • Financial systems / ledgering / payments
  • Blockchain infrastructure / on-chain data
• Strong experience designing and operating distributed systems (datastores, queues, streaming, background workers)
• Track record driving architecture decisions and seeing them through implementation and adoption
• Strong operational mindset: monitoring, on-call, incident response, and postmortems
• Excellent collaboration skills, especially with Product, Security, and Ops

Nice to Haves

• Experience with Flutter, React Native, React, Headless CRMs
• Experience with Go, Rust, Solana
• Experience with Google Cloud or Amazon Web Services
• Experience with crypto wallets, exchanges, or onchain protocols including DeFi, L2s, ZK
• Exposure to data warehousing and analytics for financial reporting
• Contributions to open-source projects

Location

• NYC preferred (with periodic in-person sprints)
• Remote-friendly within the United States and Canada; travel ~1wk/quarter

Compensation & Package

• Competitive salary and meaningful equity
• 5% 401(k) match
• Health benefits with employer-covered premiums, plus life insurance coverage
• One-time office setup stipend
• Flexible PTO