CloudLinux is the maker of Imunify360 — a suite of security products protecting millions of websites across the web hosting industry. Our email security line covers both sides of the email problem for hosting providers: an inbound anti-spam engine integrated with hosting control panels, and an outbound SMTP gateway that protects sender reputation and keeps legitimate mail out of the spam folder.Experiencia, cualificaciones y habilidades interpersonales, ¿tiene todo lo necesario para triunfar en esta oportunidad? Descúbralo a continuación.We are looking for an Engineering Team Lead to run the team that builds and operates this product line. You will lead a small, senior, fully remote squad (currently 7–8 people: Go and Python engineers, a deliverability engineer, an anti-spam engineer, and data analysis/annotation) and be accountable for what the team ships, how reliably it runs, and how the people on it grow.This is a hands-on lead role, not a pure people-management role. Expect roughly 60% leadership (delivery, technical direction, coaching, incident command) and 40% hands-on engineering (design reviews, code review, spikes, production debugging). You are not expected to be the top individual contributor on the team — you are expected to be able to read every part of the system and hold a credible technical opinion about it.You don't need to arrive as an email expert. If you have led engineers in an adjacent technical domain — infrastructure, networking, security, messaging, anti-abuse — and have a track record of getting deep into complex technical territory fast, we will teach you the email side.The system you would inherit- Inbound filtering: an Rspamd-based engine with a trained rule/ML model, released on a regular retraining cycle and measured on spam catch rate and false-positive rate.- Outbound gateway: a Halon-based SMTP relay with per-domain warm-up ladders, rate limiting, quarantine, feedback-loop (ARF) processing, and a customer portal — Go services on bare metal.- Panel integrations: cPanel/WHM, Plesk, DirectAdmin, plus Debian/Postfix deployments for large hosting partners.- Data plane: Elasticsearch, Redis, Grafana dashboards and alerting, corpus and annotation pipelines feeding model training.- Delivery: GitLab, Jenkins, Jira, weekly release cadence, blameless post-mortems within 24 hours.What you will ownDelivery:- Turn the product backlog into a credible, sequenced engineering plan — estimates, dependencies, and a release train the team actually hits.- Run the team's weekly cadence: planning, release readiness, status reporting with real numbers rather than adjectives.- Own engineering quality gates for model releases: no detection model ships without a measured catch rate and false-positive deltas against the previous model,



and a rollback path.- Keep technical debt visible and funded — negotiate it into the roadmap rather than absorbing it silently.- Report delivery status and risk to engineering leadership weekly; every item carries an owner and a due date.Technical direction:- Own the architecture of the email stack together with the architecture group: review designs, write and approve ADRs, and make build-vs-buy calls with explicit trade-offs.- Review code and designs on the critical path — mail flow, rate limiting, quarantine, authentication — and set the bar for tests, observability, and safe rollout.- Own production health: SLOs, alerting, capacity, and the deliverability posture of our sending infrastructure (IP reputation, SPF/DKIM/DMARC, rDNS, RBL listings).- Act as incident commander for product-impacting events: coordinate remediation across teams, keep partners informed, and author the post-mortem within 24 hours with named owners and dates.People:- Lead a distributed team across the globe: 1:1s, goal setting, performance reviews, and career development.- Hire: define the profile, run technical interviews, onboard, and mentor engineers- Set the working agreements that make async work — written decisions, public-by-default communication, durable artifacts over meetings.AI-augmented engineering:We evaluate engineers here partly on how effectively they work with coding agents. As the lead you are expected to model and coach this: prompt specificity, review quality on agent-generated code, tool-boundary awareness, context provision, iteration effectiveness, error recovery, and end-to-end task completion. The team has already scaffolded its repositories for agent-assisted development; extending that to the model and rule pipelines is live work.Working with the Product Owner:- The Product Owner sets priorities, owns partner commitments and the roadmap narrative. You own the plan to deliver them and the technical risk in doing so.- Escalate scope-versus-capacity conflicts early and in writing, with at least two mitigation options.First 90 days:- 30 days: Own the release train and the weekly status; be able to trace an inbound message and an outbound message end to end through the stack; complete 1:1s with every team member and produce a written read on the team's strengths and gaps.- 60 days:



Own on-call and incident command for the product line; publish the current SLOs and the top three reliability risks with mitigations; land at least one non-trivial change yourself.- 90 days: Present a technical roadmap for the email stack agreed with the PO and the architecture group, including a debt-paydown line item and a staffing recommendation.RequirementsMust have:- 5+ years as a software engineer, with 2+ years leading a team of engineers (team lead, tech lead with people responsibility, or engineering manager) in a product company.- Strong Linux proficiency at a software engineer (user) level; comfortable reading and reviewing production code in a modern high-level programming language (Python, Go, etc.), and debugging live systems on the box.- Track record of shipping and operating a distributed backend service under real production load — you have carried a pager and run incidents.- Experience mastering a complex technical domain quickly and making credible architectural decisions in it.- Practical fluency with observability and data tooling to judge quality yourself, not via reports (Grafana, Kibana/Elasticsearch, Redash or equivalents).- Demonstrated people leadership: 1:1s, performance conversations, hiring, and growing engineers.- Experience working in an agentic / AI-assisted development workflow.- Understanding of ML-driven systems, including model quality evaluation, training, and production operations.- Professional proficiency in English, written and spoken.- Availability to work EU hours.Nice to have:- Working knowledge of email infrastructure: SMTP, SPF/DKIM/DMARC, rDNS, IP reputation and warm-up, RBLs, feedback loops.- Experience with open-source mail stacks — Rspamd, SpamAssassin, Postfix, Exim, Halon — or the web hosting ecosystem (cPanel/WHM and other control panels).- Exposure to the ML model lifecycle: training data quality, evaluation metrics, and the trade-offs in tuning detection systems.- Experience running incident and escalation management with external partners.BenefitsWhat's in it for you- A focus on professional development- Interesting and challenging projects- Fully remote work with versátil working hours — schedule your day and work from any location worldwide- Paid 24 days of vacation per year, 10 days of national holidays, and unlimited sick leave- Compensation for private medical insurance- Co-working and gym/sports reimbursement- Budget for education- The opportunity to receive a reward for the most innovative idea that the company can patentBy applying for this position, you consent to the processing of your personal data as described in our Privacy Policy ( ), which provides detailed information on how we maintain and handle your data. xqbhyrx Hay opciones de teletrabajo/trabajo desde casa disponibles para este puesto.

📌 Engineering Team Lead - Email Security (Imunify Email & Email Gateway) (remote)
🏢 CloudLinux
📍 Madrid