CL

Senior Ml Engineer - Email Security (Remote Work)

CloudLinux madrid Posted 26 Oct 2026 Closing: 25 Nov 2026
Permanent
Competitive
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Job Description & Overview

What you will do

:
  • Train, evaluate, and release spam-detection models: build the corpus, pick the threshold, read the precision/recall report, decide ship or retrain.
  • Build the production side of the new engine in Go: the inference service, the mail-filter integration, the tokenizer, the streaming message parser.
  • Fix detection quality end to end, from a customer's "this phishing got through" to a rule, a corpus fix, or a retrain, with the false-positive cost weighed against the catch.
  • Keep the corpus tooling and training infrastructure running.
  • Review and approve classifier, rule, and model changes, so no release waits on one person.
  • Answer partner engineers who ask why a message scored the way it did.
  • Write specs, handbooks, and post-mortems. That is how this team transfers knowledge.

    • Your first six months:

  • Month 1: you ship a rule-model release on your own.
  • Month 3: your first piece of the new engine is merged and running on staging.
  • Month 6: a model release goes out while the principal engineer is away.

    • Requirements

    What you bring:

  • 5+ years of shipping detection or classification systems where false positives have a cost you had to defend: anti-spam, anti-phishing, anti-malware, fraud, abuse.
  • You have taken at least one ML classifier to production yourself: corpus construction, threshold selection, error analysis.
  • Hands-on transformer training in PyTorch: tokenizers, masked-language pre-training, fine-tuning, ONNX export, CPU inference measurement.
  • Linux, shell, and Python on shared servers and a shared GPU.
  • Daily usage of AI coding agents and tools.
  • English at upper-Intermediate (B2) level or higher , with particularly strong written communication skills for technical documentation, specifications, and code reviews. Your specs and merge-request descriptions count as much as your code.

    • It is a strong plus if you have:

  • Email internals: SMTP, MIME,
    • Ready to apply for this vacancy?

    This driving opportunity is hosted on CV-Library. Click below to view the official posting and submit your application.

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    Key Details
    • Date Posted: 26 Oct 2026
    • Location: madrid
    • Employment Type: Permanent
    • Category: IT
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    Employer Information
    CL
    CloudLinux
    Verified Transport Employer

    Verified transport and logistics firm operating commercial fleets across the UK network.

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