Senior Backend Engineer – Billing
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Job Description
Senior Backend Engineer responsible for building the billing engine for Hydra's AI infrastructure. Focusing on financial transactions, audits, and scalable systems in a startup environment.
Responsibilities:
- Act as a hands-on senior backend engineer owning production billing systems end to end
- Own the design and implementation of Hydra’s end-to-end billing engine and settlement systems, writing and operating production backend services
- Build and maintain a double-entry ledger that provides a complete, immutable paper trail for all financial activity, designed for high concurrency and strict correctness guarantees
- Implement contract-aware billing logic derived from infrastructure lifecycle events (provisioning, decommissioning, maintenance, etc.)
- Generate accurate invoices and earnings reports for renters and data center partners
- Build automated payout systems to suppliers and partners, ensuring fast and correct settlement
- Partner closely with Product, Accounting, Engineering, and Operations to translate real-world contracts into robust software
Requirements:
- Deep experience building billing, ledger, or financial transaction systems as a hands-on backend engineer
- Strong understanding of double-entry accounting and financial primitives (debits, credits, assets, liabilities)
- Experience with invoicing systems, payment processors, and money movement flows
- Proven ability to design resilient systems with idempotency, guarantees, auditability, and strong automated test coverage
- Deep experience handling concurrency, race conditions, and double-spend prevention in high-stakes financial systems
- Experience with event-driven or asynchronous architectures
- Comfort working across multiple systems and domains (product, finance, operations)
- High standards for data integrity, quality, automated testing
- Proven track record of owning complex, high-stakes systems end to end.
Benefits:
- Competitive compensation
- Meaningful equity
- Full benefits
- Remote-first team with hubs in Phoenix, Boulder, and Miami
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