Senior Anti-Abuse Security Engineer

• Architect and implement automated behavioral analysis pipelines to detect trial abuse, account takeovers, and sophisticated sending pattern anomalies
• Build continuous risk scoring systems that evaluate customer accounts across their entire lifecycle to proactively identify emerging threats
• Develop a sender reputation tracking system that seamlessly integrates with email deliverability signals to safeguard our platform's reach
• Engineer advanced analysis capabilities for campaign content, including specialized tools for URL, image, and web-based threat detection
• Deploy complex detection logic and custom Python services, utilizing Sift rules to automate real-time security responses
• Collaborate with the Security Platform Engineering team to enhance the data pipelines feeding our core security and monitoring tools
• Design automated response workflows—from account suspension and campaign throttling to manual review queuing—to mitigate abuse at scale
• Partner with Product Security Engineering to instrument AI feature telemetry and build systems capable of detecting synthetic content and inauthentic behavior

• 5+ years of hands-on experience building robust fraud detection, abuse prevention, or security monitoring systems
• Expert-level Python development skills, with a proven track record of writing production-grade code integrated into large-scale systems
• Deep expertise in messaging abuse patterns, specifically regarding email/SMS phishing, spam, and the nuances of sender reputation
• A strong understanding of ML-based detection systems and behavioral analytics, with the ability to build automated detection at scale with limited resources
• Technical proficiency with modern abuse tooling (e.g., Sift) and ideally experience in content moderation or text/image analysis
• A collaborative mindset and the ability to work cross-functionally with engineering, product, and security teams to drive strategic security outcomes

Prior experience in SaaS messaging, marketing automation, or Email Service Provider (ESP) platforms a bonus—you understand the unique abuse dynamics of our industry

• Comprehensive Health & Wellness: Top-tier benefits package that includes a fully-covered High Deductible Health Plan (HDHP), complimentary access to telehealth services, and a free subscription to Calm
• Growth & Development: Access to LinkedIn Learning, professional development programs, and career growth opportunities in a fast-growing organization
• Generous Paid Time Off: Recharge and take the time you need to maintain work-life balance with open PTO
• Total Rewards: Generous 401(k) matching with immediate vesting, quarterly perks with commuter and lunch benefits for hub based employees or a stipend for remote workers, and a four-week paid sabbatical with bonus after five years
• Collaborative Culture: Work alongside brilliant, passionate colleagues in an environment that values innovation, teamwork, and mutual support