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Castle is hiring a
Senior ML Engineer

About Castle

Castle is a YC-backed Series A startup helping companies like Canva, Atlassian, and Rockstar Games fight fraud and abuse. They are building modern, AI-powered bot detection and abuse prevention tech, with a focus on real-time protection and behavioral intelligence.

Job Description

You'll work on real-time ML pipelines, anomaly detection, and adversarial ML techniques to stop bots and malicious actors. Combining traditional fraud signals with modern AI—LLMs, behavioral clustering, and vector-based search—to stay ahead of attackers. You'll own models end to end and deploy quickly, with direct access to rich, structured behavioral and fingerprinting data. Ideal for someone with strong experience in the anti-fraud/anti-bot field who loves cutting-edge ML and wants immediate impact.

Remote

Remote Conditions

Fully remote from Europe/EMEA timezone

Salary

Not Specified

Benefits

US salaries globally, Flexible hours, Unlimited PTO, Paid parental leave

Tech Tags

AIAdversarial MLAnomaly DetectionBot DetectionFraud DetectionML

Senior Role

Date Listed

03 April, 2025 (12 months ago)
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