Engineering · Platform

Senior Backend Engineer

Remote (UK/EU)· Full-time· £90–130k + equity

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