Senior Backend Engineer
Summary
Build and own a high-performance routing engine, billing infrastructure, and webhook delivery using Python, FastAPI, and MongoDB for a fintech lead-processing platform.
Own the routing engine, billing infrastructure and webhook delivery. Python/FastAPI/MongoDB. We process every inbound lead through code you write — sub-100ms p99 latency, idempotent everything, audit-trail everything.
Who you are
- 6+ years building production Python services — async/await fluent
- Deep MongoDB experience including indexing, aggregation, transactions
- Have built billing or payments infra you're proud of
- Care about correctness — money flows through this code
What you'll own
- Own ping-tree v2 (multi-buyer parallel routing)
- Lead the CRM connector platform (HubSpot/Salesforce/Pipedrive)
- Set the engineering bar for the next 5 hires