Staff Backend Engineer, Billing & Metering

Engg; San Francisco (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Comfy, a San Francisco-based AI workflow platform, seeks an accomplished backend engineer to own its billing stack. You will meter GPU usage, manage credits and subscriptions, and ensure accurate invoicing across model providers and APIs.

You’ll work with Stripe, Metronome, and Temporal in a Kubernetes, PostgreSQL, Redis-driven environment. As a senior engineer, you’ll drive reliability, implement new pricing models, and collaborate with Support, Finance, and Product to improve the customer

Qualifications

• Built and operated billing or payments systems with ownership of usage metering or consumption-based pricing.
• Integrated Stripe directly and handled subscriptions, invoices, webhooks, and failed payments beyond the happy path.

Responsibilities

• Capture usage reliably and meter GPU compute and partner APIs.
• Own the payment lifecycle: checkout, subscriptions, credits, plan changes, prorations, refunds.
• Reconcile charges, payments, and credits with automated checks and audit trails.
• Make pricing easier to ship with reusable pricing/entitlement systems for various customer segments.
• Limit fraud and abuse with spend controls and detection, collaborating with Support/Finance.
• Provide clear billing insights to product, frontend engineers, and finance teams.

Skills

Billing systems

Payments integration

Distributed systems

Backend engineering

Financial accuracy

Tools

Stripe

Metronome

Temporal

PostgreSQL

Redis

Go

Python

Kubernetes

Job description

Comfy, a San Francisco-based AI workflow platform, seeks an accomplished backend engineer to own its billing stack. You will meter GPU usage, manage credits and subscriptions, and ensure accurate invoicing across model providers and APIs.

You’ll work with Stripe, Metronome, and Temporal in a Kubernetes, PostgreSQL, Redis-driven environment. As a senior engineer, you’ll drive reliability, implement new pricing models, and collaborate with Support, Finance, and Product to improve the customer