Senior Fraud Engineer

As our next Senior Fraud Security Engineer, you won’t just be monitoring logs—you will be the primary architect of the next generation of abuse detection capabilities for our platform. You’ll move beyond routine security tasks to design and build sophisticated, automated behavioral analysis pipelines that protect our ecosystem from trial abuse, account takeovers, and evolving sending anomalies. In this high-impact, high-visibility role, you will partner directly with Security and Product leadership to translate complex threat landscapes into tangible automated defenses, ensuring our platform remains a trusted environment for millions of users. About ActiveCampaign: ActiveCampaign is the autonomous marketing platform for people at the heart of the action. It empowers teams to automate their campaigns with AI agents that imagine, activate, and validate–freeing them from step-by-step workflows and unlocking limitless ways to orchestrate their marketing. With AI, goal-based automation, and 1,000+ app integrations, agencies, marketers, and owners can build cross-channel campaigns in minutes–fine-tuned with billions of data points to drive real results for their unique business. ActiveCampaign is the trusted choice to help businesses unlock a new world of boundless opportunities–where ideas become impact and potential turns into real results. As a global multicultural company, we are proud of our inclusive culture which embraces diverse voices, backgrounds, and perspectives. We don’t just celebrate our differences, we believe our diversity is what empowers our innovation and success. You can find out more about our DEI initiatives here. Perks and benefits: At ActiveCampaign, we prioritize employees’ well-being and professional growth by cultivating a culture centered on collaboration and innovation. When you join our team, you’ll not only have the opportunity to make a significant impact, but also enjoy a range of benefits tailored to support your personal and career development. Here are some of the benefits we offer: -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. ActiveCampaign is an equal opportunity employer. We recruit, hire, pay, grow and promote no matter of gender, race, color, sexual orientation, religion, age, protected veteran status, physical and mental abilities, or any other identities protected by law. Our Employee Resource Groups (ERGs) strive to foster a diverse inclusive environment by supporting each other, building a strong sense of belonging, and creating opportunities for mentorship and professional growth for their members. On a typical day, you might: 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. The ideal candidate will bring: 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. Prior experience in SaaS messaging , marketing automation, or Email Service Provider (ESP) platforms a bonus—you understand the unique abuse dynamics of our industry. A collaborative mindset and the ability to work cross-functionally with engineering, product, and security teams to drive strategic security outcomes.

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