Backend Engineer - Fraud Prevention & Scale Systems

Prelude is redefining how companies authenticate and onboard users, turning what used to be a cost center into a growth lever. Our flagship product delivers OTP codes with the best price-to-conversion ratio by dynamically selecting the most effective channel in real time (optimized SMS, WhatsApp, and more) while actively blocking spam and fraud.

Based in Paris, we are 60-strong and expanding across Europe and the US, building a platform for trust at scale with a roadmap of market-defining