[Remote] Machine Learning Engineer II

Note: The job is a remote job and is open to candidates in USA. Abnormal AI is a leading cybersecurity startup focused on protecting customers against evolving security threats. They are seeking a Machine Learning Engineer II to join their Attack Detection team, where the role involves designing and implementing systems for email detection, improving model efficacy, and contributing to the technical roadmap to address customer challenges.ResponsibilitiesDesign and implement systems that combine rules, models, feature engineering, and business and product inputs into an email detection product, with senior engineer guidanceUnderstand features that distinguish safe emails from email attacks, and how our model stack enables us to catch themIdentify and recommend new features groups or ML model approaches that can significantly improve detection efficacy for a product. Work with infrastructure & systems engineers to productionize signals to feed into the detection systemWrites code with testability, readability, edge cases, and errors in mindTrain models on well-defined datasets to improve model efficacy on specialized attacksActively monitor and improve FN rates and efficacy rates for our message detection product attack categories, through feature engineering, rules and ML modelingAnalyze FN and FP datasets to categorize capability gaps and recommend short term feature and rule ideas to improve our detection efficacyContribute in other areas of the stack: building and debugging data pipelines, or presenting results back to customers in our tools when the occasion arisesSkills3+ years experience designing, building and deploying machine learning applications in one of the domains of text understanding, entity recognition, NLP experience, computer vision, recommendation systems, or search1+ years of experience with writing stable and production level pipelines for model training and evaluation leading to reproducible models and metricsExperience with data analytics and wielding SQL+pandas+spark framework to both build data and metric generation pipelines, and answer critical questions about system efficacy or counterfactual treatmentsAbility to understand business requirements thoroughly and bias toward designing a simplest yet generalizable ML model / system that can accomplish the goalUses a systematic approach to debug both data and system issues within ML / heuristics modelsFluent with Python and machine learning toolkits like numpy, sklearn, pytorch and tensorflowEffective software engineering skills who can find answers quickly from code base and writes structured, readable, well tested and efficient codeBS degree in Computer Science, Applied Sciences, Information Systems or other related engineering fieldMS degree in Computer Science, Electrical Engineering or other related engineering fieldExperience with big data, statistics and Machine LearningExperience with algorithms and optimizationBenefitsBonus or incentive compensationEquityA comprehensive benefits packageCompany OverviewAbnormal AI is the leading AI-native human behavior security platform. It was founded in 2018, and is headquartered in Las Vegas, Nevada, USA, with a workforce of 1001-5000 employees. Its website is https://abnormal.ai/.Company H1B SponsorshipAbnormal AI has a track record of offering H1B sponsorships, with 3 in 2026, 4 in 2025. Please note that this does not guarantee sponsorship for this specific role.