Senior ML Engineer - Email Security (remote work)
Core
Develop and deploy transformer-based ML models for email security to filter spam, phishing, and threats on customer hosting servers.
Role type
Senior Machine Learning Engineer (Email Security)
Builds
Production email security engine (inference service, mail-filter integration, tokenizer, streaming parser) and ML models
Domain
Cybersecurity / Email Security / Machine Learning
Deliverable
production ML models
Required skills
Transformer training (PyTorch), corpus construction, threshold selection, error analysis, Go, Linux, shell, Python, ONNX export, CPU inference optimization
Preferred skills
Email internals (SMTP, MIME, SPF/DKIM/DMARC), embedded models, Go/Rust systems code, rspamd/SpamAssassin internals, multi-million-sample corpora, model quantization/distillation, LLM-based labelers
Technologies
PyTorch, Go, Linux, Python, ONNX, rspamd, SpamAssassin
Responsibilities
Train and release spam-detection models, build production inference services, fix detection quality end-to-end, maintain training infrastructure, review and approve model changes, answer partner engineers on scoring logic
Seniority
Senior, hands-on IC
