Billing Engineer

About E2BE2B is a fast-growing Series A startup with over $37M in funding and 8-figure revenue. We are building the Agent Cloud and power the infrastructure behind AI labs and some of the most widely used consumer and enterprise agents, including Manus, Genspark, Lindy, Groq, and Artificial Analysis. Our team includes original authors of Firecracker, the AWS microVM technology powering Lambda, along with alumni of Cognition, JetBrains, Zapier, and Wish.About the roleYour job is to own billing at E2B — everything that touches how we charge customers, collect revenue, and capture the data behind it. The metering pipeline, the Stripe integration, invoicing, collections, and the billing surfaces developers see in the dashboard.Your code will be responsible for collecting data metrics, creating and sending invoices and reconciliation of payments for our customers across the globe.We have a billing system. Your job is to take it over end to end and redesign it. Engineering, finance, and customers all depend on the system and the data it produces, and you'll work across all three. When a customer asks why their invoice looks the way it does, you're the person who can answer. Responsibilities include:Owning the services behind billing end-to-end — usage metering, charge calculation, invoicing, payments, and the data models underneath themOwning the Stripe integration end-to-end: subscriptions, Billing Meters, and enterprise invoicing edge casesBuilding billing automation: failed-payment recovery, collections, proration and plan changes, credits, refunds, and disputesWorking with engineers across Core, Platform, and Dashboard to get the data billing depends on, and defining the contracts for itPartnering with finance on reconciliation, revenue reporting, and audit-readinessMaking architectural decisions around observability, testing, and securityWhat we're looking forUnderstanding of metric collection, metered usage, Pay-as-you-go, billing cycles - being able to understand finance requirements and translate them into well tested codeBackend engineer with 5+ years billing systems experience, with deep expertise in GoStrong API design — REST/RPC, contracts and versioningSolid with PostgreSQL: schema design, query optimization, migrations, and reasoning about data at scaleBackend fundamentals: authentication/authorization, server-side performance, and building real-time data flows (WebSockets, SSE)Experienced with charging logic, collections, billing automation, and billing-related data flowsComfortable with complex invoicing, SKUs, usage-/contract-based billing, and third-party payment platformsStrong cross-functional communication skills, especially with financeComfortable owning a system end-to-end with high autonomyAble to work through ambiguity and figure things out independentlyWhat it’s like to work at E2BWe’re a fast-growing startup with in-person (4 days on-site, 1 day WFH) offices in San Francisco and Prague, Czech Republic. We already generate 8-figure revenue and work directly with top-tier AI companies like Manus, Genspark, Lindy, Groq, Artificial Analysis and other exciting teams pushing the frontier of AI.We offer healthcare, vision, and dental insurance, unlimited PTO, 401k, and a variety of perks for in-office employees.