About the Role

Abnormal AI is seeking an experienced and technically strong Machine Learning Engineer (MLE) to join the Misdirected Email Prevention (MEP) team. The MEP team plays a critical role in preventing accidental data loss by detecting and blocking misdirected outbound emails, delivering protection at scale without adding operational burden to customer SOCs.

This is a highly applied role for MLEs who thrive on building, iterating, and experimenting. Rather than focusing solely on model training, you will also be responsible for developing practical, end-to-end ML solutions. This includes but is not limited to generating and refining embeddings, testing hypotheses, averaging signals, and translating research ideas into production-grade systems, all while collaborating cross-functionally to turn customer needs into measurable product improvements. The ideal candidate combines a tinkerer’s mindset with technical rigor, balancing innovation with production excellence to drive experimentation, scale solutions, and deliver reliable detection capabilities that create meaningful customer impact in real-world environments.

What you will do

• Partner with PM, TL, EM and UTL to align technical deliverables to roadmap milestones and ensure successful GA launches across supported environments
• Own the full ML lifecycle for MEP, including data wrangling, feature engineering, model training and evaluation, deployment, and monitoring. Delivering iterative improvements with measurable reliability and customer impact
• Run rigorous experiments and evaluations (offline metrics, online A/B testing, post-launch monitoring), set thresholds, and conduct targeted error analysis to prevent regressions
• Communicate effectively across time zones, maintain high-quality technical documentation, and contribute to shared team knowledge
• Participate in shared on-call rotation for owned components, with responsibilities focused on detection efficacy. Priorities include resolving efficacy-related alerts, investigating high-visibility false positives, and addressing reported false positives/false negatives from customers or internal teams

Must Haves

• BS degree in Computer Science, Machine Learning, Artificial Intelligence, Information Systems, or a related engineering or quantitative field
• 3+ years building and operating applied ML features in production systems
• Proven experience building end-to-end ML systems, including data wrangling (text and structured), feature engineering, model selection, training, evaluation, and production deployment with monitoring
• Demonstrate ability to implement and reason about algorithms, develop embeddings, average and combine signals, and apply numerical computing effectively
• Demonstrate ability to interrogate production data, identify behavioral or trend shifts, and launch targeted experiments to improve model efficacy
• Display understanding of online vs offline pipelines, data tables and labeling workflows to effectively leverage tooling to support safe, scalable model deployments
• Experience running offline metrics, online A/B tests, setting thresholds, and monitoring drift and performance, with guardrails and rollback strategies to ensure reliable iteration
• Strong written and asynchronous communication skills. Effective working independently and across distributed, cross-functional teams

Nice to Have

• Experience with our stack: Python, Go, AWS, K8s, Django, Spark, Prometheus
• Experience in email security/DLP or misdirected email prevention domains and customer-focused ML deployments
• Experience writing detectors/rules to complement ML models for safe launches and rapid iteration
• Experience with operationalising research into reliable, customer-facing systems, with emphasis on scalability, performance, and detection accuracy in real-world environments
• Prior experience leading a small team or project to deliver a feature or component from scratch

#LI-MT1