At Halon, our mission is straightforward, yet powerful and complex: empower businesses through dynamic email operations. 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.

Our Core Values

Clients first - We want our clients to succeed and we exceed their expectations.

Passion & commitment - We are ambitious, motivated by joy, innovative and we love to win.

Move fast, together - We put words into action and clearly communicate goals and expectations.

Trust created by transparency - We are honest and foster a culture of mutual respect and kindness.

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.

What You´ll Do:

- Design and implement cutting-edge ML models using state-of-the-art technologies, including LLMs, Transformers, Reputation systems to detect and mitigate security threats like phishing, malware, and business email compromise.
- 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.<

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