Senior Backend & Platform Engineer – FinOps, IAM & Blockchain

As a Senior Backend & Platform Engineer at Moonshot, you own some of the most critical systems in the stack: identity and access, funds movement and ledgering, and the blockchain infrastructure that powers on-chain trading. Moonshot is the "Robinhood for DeFi"-an iOS and Android app that lets anyone trade cryptocurrencies on-chain through a user-friendly interface. Since launch in July 2024, the app has attracted 2M+ users. You 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 including authentication flows, sessions, device trust, authorization and entitlements (roles, permissions, policies), and security controls such as MFA and key management in collaboration with security teams.
• Own financial operations systems including transfers and payments orchestration, ledgering and reconciliation flows, limits, risk controls, and transactional correctness.
• Build and maintain blockchain infrastructure including node and RPC management, transaction submission, monitoring and retry logic, and 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.

What you bring

• 5-12+ years of backend, 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, or Blockchain infrastructure / on-chain data.
• Strong experience designing and operating distributed systems including datastores, queues, streaming, and background workers.
• A track record driving architecture decisions and seeing them through implementation and adoption.
• A strong operational mindset: monitoring, on-call, incident response, and postmortems.
• Excellent collaboration skills, especially with Product, Security, and Ops.

Nice to have

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

What we offer

• 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.
• NYC preferred with periodic in-person sprints; remote-friendly within the United States and Canada with approximately 1 week per quarter travel.

About Moonshot

Moonshot is the "Robinhood for DeFi"-an iOS and Android app enabling anyone to trade cryptocurrencies on-chain through a user-friendly interface. Since launch in July 2024, Moonshot has attracted 2M+ users and is building the infrastructure to make life-changing financial outcomes within everyone's reach.