Staff Full Stack Engineer (Backend focused)

FlyBox is building an on-demand storage platform with customer applications, operational tools, billing, and cloud infrastructure. The Staff Full-Stack Engineer will primarily own the backend GraphQL API and domain services for customers, orders, subscriptions, billing, and warehouse operations, while also contributing to web administration and native mobile applications. The role includes operating production systems, integrating third-party services, using AI coding tools, and maintaining high testing and code quality standards.

Responsibilities:

• Design, build, and operate our TypeScript GraphQL and REST APIs, including schema design, resolvers, and access control
• Own persistence in PostgreSQL and Sequelize: models, migrations, performance, and transactional integrity for orders and billing
• Build background processing: BullMQ job queues, scheduled work, webhooks, and an outbox pattern for side effects
• Integrate and harden third-party systems for payments, tax, address validation, auth, and shipping
• Ship features in our Next.js admin app when operations needs them
• Carry features into the mobile apps when needed: update GraphQL queries, screens, and flows in our native iOS (Swift) and Android (Kotlin/Compose) apps, partnering with our mobile engineers
• Use AI coding agents and tools every day to design, write, test, and review code, and help shape how our team uses them
• Raise the quality bar through tests (unit, integration, Testcontainers), code review, and production debugging

Requirements:

• 8+ years building production software, most of it backend, including Staff-level ownership of a substantial domain
• Expert TypeScript/Node.js, with production GraphQL (Apollo or equivalent) and REST/webhooks
• PostgreSQL and an ORM (Sequelize or similar) used seriously in production, including migrations and query performance
• Job queues and async processing (BullMQ, Sidekiq, or equivalent)
• You've owned checkout, billing, subscriptions, or similarly unforgiving money flows: idempotency, retries, webhook reconciliation
• Comfortable shipping React/Next.js features end to end
• Comfortable working in a native mobile codebase (Swift or Kotlin) with AI tools. You don't need to be a mobile specialist, but a mobile change shouldn't be a blocker for you
• Daily hands-on use of AI coding tools (Claude Code, Cursor, Copilot, or similar), with a view on where they help and where they need guardrails
• Strong testing habits, and the judgment to fix a messy module without rewriting it
• BS in Computer Science or equivalent practical experience
• Candidates must live in North Carolina
• Must be authorized to work in the US
• We are unable to sponsor visas now or in the future
• Nice to have: Braintree, Avalara, Auth0, Zod, Sentry/pino, hexagonal or vertical-slice architecture, or logistics/subscription experience