Backend Engineer — Billing

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A built-in data warehouse, so users can query product and customer data together using custom SQL insights.
A customer data platform, so they can send their data wherever they need with ease.
PostHog AI, an AI-powered analyst that answers product questions, helps users find useful session recordings, and writes custom SQL queries.

Scaling our billing system to $100M+ revenue (the hundy) by the end of 2026, and well beyond (the billy?).
Building billing primitives flexible enough that launching a new pricing model doesn't require rearchitecting everything.
Making our usage reporting and limiting near-realtime.
Turning usage and messy raw invoice data into actionable internal reports, accurate forecasts, and compliant financials.
Making all of the above go brrr.

Implementing a new, ledger-based revenue model and re-building all dashboards and investor reports on top of it.
Making billing the source of truth for pricing, subscriptions and invoicing.
Shipping 5+ pricing launches and changes this quarter, including two new pricing models.

Strong backend engineer. Python, SQL, and complex data modeling should feel like home.
Edge cases make you excited, not anxious.
Experience with data pipelines, task queues, and workflow orchestration - we still have a lot of Celery but are leaning more into Temporal and Dagster.
If you've done something manually twice (or seen someone else do it) - you're already building an automation or an internal tool to make it easier.
Happy paths are maybe 10% of billing. You treat error handling, rollbacks, and retries as the actual work - not TODOs you'll "get to later".
You don't need someone to tell you what to build. You've started a company, led a major project from scratch, or shipped an impressive side project.

You've built and scaled usage-based billing systems before (and have the scars to prove it).
You get weirdly excited about revenue modeling, forecasting and accounting ledgers.
You have a decent guess which one of these we made up: Q2C / AR / B2R / GAAP / ASC 606 / NRR.

You only want to work with other engineers - billing touches every team at PostHog, from product to finance to GTM to marketing.
You need clearly defined requirements before you start building.
You think billing is a solved problem - we thought so too, once.

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