{"id":3171637,"url":"https://alion.io/job/cloudlinux-senior-ml-engineer-email-security-remote-work","title":"Senior ML Engineer - Email Security (remote work)","company":{"id":3432,"name":"CloudLinux","domain":"cloudlinux.com","url":"https://alion.io/company/cloudlinux","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":null},"role":"AI/ML","role_family":"AI/ML","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Warsaw, Poland","Sofia, Bulgaria","Podgorica, Montenegro","Tbilisi, Georgia","Yerevan, Armenia","Madrid, Spain"],"countries":["PL","BG","ME","GE","AM","ES"],"hiring_countries":["BG","PL","ES","AM","GE"],"hiring_countries_total":5,"salary":null,"salary_estimate":{"min_usd":65000,"max_usd":115000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":44},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Fine-tuning","optional":false},{"name":"Knowledge Distillation","optional":false},{"name":"Linux","optional":false},{"name":"LLM","optional":false},{"name":"Lua","optional":false},{"name":"Machine Learning","optional":false},{"name":"Model Distillation","optional":false},{"name":"ONNX","optional":false},{"name":"Pre-training","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"Quantization","optional":false},{"name":"Rust","optional":false},{"name":"Tokenization","optional":false}],"status":"live","first_seen_at":"2026-10-23T18:45:19Z","employer_posted_date":"2026-10-23","last_verified_at":"2026-10-24T11:20:40Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"CloudLinux is a global remote-first company. We are driven by our principles: do the right thing, employees first, we are remote first, and we deliver high-volume, low-cost Linux infrastructure and security products that help companies to increase the efficiency of their operations. Every person on our team supports each other and does what we can to ensure we all are successful.\nCheck out our website for more information: https://cloudlinux.com/\nCloudLinux Inc. develops theImunify family of security products, designed to protect hosting environments from a wide range of cyber threats. One of these solutions is Imunify Email, an email security product that protects hosting servers against spam, phishing, and other email-based threats.\nImunify Email filters mail on about 5,000 hosting servers. Today the filter is rspamd with rules and a scoring model we train in-house. We are replacing it with a transformer we trained ourselves that runs on the customer's own CPU in under 100 MB and already beats rspamd at every operating point we measured. We are looking for a Senior Machine Learning Engineer to join our team and work alongside the engineer currently responsible for both the existing spam-filtering pipeline and the new ML model. Together, you will drive the development, improvement, and production rollout of our email security technology.\nWhat you will do:\nTrain, evaluate, and release spam-detection models: build the corpus, pick the threshold, read the precision/recall report, decide ship or retrain.\nBuild the production side of the new engine in Go: the inference service, the mail-filter integration, the tokenizer, the streaming message parser.\nFix 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.\nKeep the corpus tooling and training infrastructure running.\nReview and approve classifier, rule, and model changes, so no release waits on one person.\nAnswer partner engineers who ask why a message scored the way it did.\nWrite specs, handbooks, and post-mortems. That is how this team transfers knowledge.\nYour first six months:\nMonth 1: you ship a rule-model release on your own.\nMonth 3: your first piece of the new engine is merged and running on staging.\nMonth 6: a model release goes out while the principal engineer is away.\nRequirements\nWhat you bring:\n5+ 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.\nYou have taken at least one ML classifier to production yourself: corpus construction, threshold selection, error analysis.\nHands-on transformer training in PyTorch: tokenizers, masked-language pre-training, fine-tuning, ONNX export, CPU inference measurement.\nLinux, shell, and Python on shared servers and a shared GPU.\nDaily usage of AI coding agents and tools.\n 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.\nIt is a strong plus if you have:\nEmail internals: SMTP, MIME, transfer encodings, SPF / DKIM / DMARC, how Exim, Postfix, and Dovecot handle mail to a filter.\nExperience in creating embedded models\nGo or Rustfor systems code: parsers, streaming, memory budgets, concurrency.\nrspamd or SpamAssassin internals: rules, composites, Lua plugins, mass-check scoring.\nMulti-million-sample corpora, labelling pipelines, annotator tooling.\nSmall models for constrained hardware: quantization, distillation, latency budgets.\nLLM-based labelers or validators for scaling annotation.\nHosting panels: cPanel, Plesk, DirectAdmin.\nBenefits\nWhat's in it for you?\nA focus on professional development.\nInteresting and challenging projects.\nFully remote work with flexible working hours, that allows you to schedule your day and work from any location worldwide.\nPaid 24 days of vacation per year, 10 days of national holidays, and unlimited sick leaves.\nCompensation for private medical insurance.\nCo-working and gym/sports reimbursement.\nBudget for education.\nThe opportunity to receive a reward for the most innovative idea that the company can patent.\nBy applying for this position, you consent to the processing of your personal data as described in our Privacy Policy (https://cloudlinux.com/candidate-privacy-notice), which provides detailed information on how we maintain and handle your data.","description_format":"text","description_chars":4561,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":["Flexible schedule","Health insurance","Professional development"],"hiring_locations":[{"name":"Bulgaria","iso":"BG","kind":"country"},{"name":"Poland","iso":"PL","kind":"country"},{"name":"Spain","iso":"ES","kind":"country"},{"name":"Armenia","iso":"AM","kind":"country"},{"name":"Georgia","iso":"GE","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Email Security","Operating Systems","Vulnerability Management","Web Security & DDoS Protection"],"lifecycle":[{"event":"open","at":"2026-10-23T18:45:19Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring 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