Stefan Yasin - Writing Field notes on technical operations, infrastructure, and applied AI. https://stefanyasin.github.io/ 2026-10-21T00:00:00Z Stefan YasinStefanYasin@gmail.com How to check whether a Python package is malicious https://stefanyasin.github.io/blog/posts/check-if-python-package-is-malicious.html 2026-10-21T00:00:00Z A backdoored LiteLLM release shipped a credential stealer in site-packages. The checks I run before and after installing a dependency. Alert severity that people actually respect https://stefanyasin.github.io/blog/posts/alert-severity-that-people-respect.html 2026-10-11T00:00:00Z Most alerting systems have too many levels and no owners. The four-tier severity model I use, with ack windows and escalation timers. Monitoring a homelab you cannot always reach https://stefanyasin.github.io/blog/posts/monitoring-a-homelab-you-cant-always-reach.html 2026-10-11T00:00:00Z Silent failures cost the most. What to watch in a remote lab, what to ignore, and the outside-in heartbeat that catches a dead monitoring host. What a $0 home lab taught me about enterprise ops https://stefanyasin.github.io/blog/posts/zero-dollar-homelab-enterprise-ops.html 2026-08-30T00:00:00Z Break things on purpose so production stays boring: the cost discipline, failure modes, and transferable lessons of running a lab on leftovers. From Apple Genius to building AI ops tooling https://stefanyasin.github.io/blog/posts/from-apple-genius-to-ai-ops-tooling.html 2026-08-30T00:00:00Z Explaining tech to humans in 2014 turned out to be the same skill as building systems that explain themselves in 2026. Why I open-source my monitoring tools https://stefanyasin.github.io/blog/posts/why-i-open-source-my-monitoring-tools.html 2026-08-30T00:00:00Z Abandoned tools, fake claims, and why MIT with an honest README beats marketing. What open source actually gets you when nobody is watching. How I cut incident response from hours to minutes https://stefanyasin.github.io/blog/posts/incident-response-hours-to-minutes.html 2026-08-28T00:00:00Z Collect, enrich, route, escalate. How I rebuilt alerting across a multi-site manufacturing operation. Backporting modern health monitoring onto 2016-era servers https://stefanyasin.github.io/blog/posts/backporting-modern-monitoring-to-legacy-poweredge.html 2026-08-28T00:00:00Z A testable decision core behind a thin hardware layer: rackpulse on old Dell PowerEdge and ESXi 6.7. Running an AI-assisted ops stack on a near-zero budget https://stefanyasin.github.io/blog/posts/ai-assisted-ops-stack-near-zero-budget.html 2026-08-28T00:00:00Z Three tools that talk to each other beat eight that don't. The agent stack my job hunt and my lab run on. The solar-powered lab that simulates a data center https://stefanyasin.github.io/blog/posts/solar-powered-lab-that-simulates-a-data-center.html 2026-08-28T00:00:00Z A 40GbE backbone, whole-home automation, and why the lab is the best interview prep I know.