Machine Learning Engineer I - Message Security Products
Abnormal SecurityEmail Security company
Singapore, SingaporeJunior
Wellington Management
Greylock Partners
Menlo Ventures
Insight Partners
CrowdStrike Falcon Fund
Data & AI
About the role
TL;DR
Build and operate end-to-end ML solutions for misdirected email detection.
- •Abnormal AI is seeking a Machine Learning Engineer
- •I (MLE) to join the Misdirected Email Detection (MED) team.
- •The MED 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 features, 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 Product Manager, Tech Lead and engineering stakeholders to align technical deliverables to roadmap milestones and ensure successful GA launches across supported environments.
- •Own the full ML lifecycle for Misdirected Email, including data wrangling, feature engineering, model training and evaluation, deployment, and monitoring.
- •Deliver 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 and realtime scoring systems.
- •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. 1+ years building and operating applied ML features in production systems.
- •Proven experience contributing to end-to-end ML systems, including data wrangling (text and structured), feature engineering, model selection, training, evaluation, and production deployment with monitoring.
- •Demonstrated ability to implement and reason about algorithms, develop features, average and combine signals, and apply numerical computing effectively.
- •Demonstrated ability to interrogate production data, identify behavioral or trend shifts, and launch targeted experiments to improve model efficacy.
- •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, Spark, Databricks 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 contributing to a small team or project to deliver a feature or component from scratch. #LI-UC1
Required skills
Pythonscikit-learnAWSSparkDatabricksNLPA/B Testing
Nice-to-have skills
GoTensorFlowPyTorch
Domain expertise
cybersecurity
Tech stack
PythonGoAWSSparkDatabricksscikit-learnTensorFlowPyTorch