In an era where email is still the most important communications channel for business success, we provide fully-secure solutions that power innovation with flexibility, scalability and control. To help shape the next chapter of our email security platform, we are seeking an experienced and highly motivated Software Engineer with Machine Learning knowledge to join our email security division. In this role, you will be at the forefront of designing, building, and deploying sophisticated machine learning models to protect businesses from a wide range of email-based threats. You will own the full lifecycle of ML solutions, from data processing and model training to deployment and maintenance in a scalable, cloud-native environment.
Develop robust services for automated threat triage, content anonymization, and the retrieval of security intelligence from vast datasets.
Build and manage end-to-end Machine Learning pipelines for training, evaluation, and deployment of models for tasks such as threat forecasting and anomaly detection.




Transform prototypes into production-ready data and ML applications that meet throughput and latency requirements.
Work with a variety of models, from neural networks to tree-based algorithms, and manage them effectively using tools like MLflow.
Champion the transition from manual processes to a fully automated MLOps environment, implementing CI/CD pipelines, testing, alerting, and advanced logging to ensure stability and scalability in production.
Create and maintain ETLs to process large volumes of data for reporting, model training, and critical decision-making, ensuring data integrity and confidentiality.
Collaborate closely with data scientists, security engineers, and other stakeholders to deploy and maintain core threat detection models in production.
Master's or PhD in Computer Science, Machine Learning, or a related quantitative field, or a Bachelor's degree with equivalent senior‐level industry experience.
Experience contributing to

📌 Senior Machine Learning Engineer (Madrid)
🏢 Halon
📍 Madrid