Staff Engineer. Builder of products, personal tools, and open-source. Monospace-first.https://ko-wal-ski.pages.dev/en-ushttps://ko-wal-ski.pages.dev/blog/engineering/observability-cut-p99-latency/https://ko-wal-ski.pages.dev/blog/engineering/observability-cut-p99-latency/A single OpenTelemetry trace showed us where to look. The fix was a five-line config change.Tue, 12 May 2026 00:00:00 GMTengineeringobservabilityopentelemetryplatform-engineeringhttps://ko-wal-ski.pages.dev/blog/open-source/maintainer-burnout/https://ko-wal-ski.pages.dev/blog/open-source/maintainer-burnout/Three years running a popular Go library taught me that the work isn't the code — it's the inbox.Tue, 28 Apr 2026 00:00:00 GMTopen-sourcegoplatform-engineeringhttps://ko-wal-ski.pages.dev/blog/retrospectives/incident-2026-04/https://ko-wal-ski.pages.dev/blog/retrospectives/incident-2026-04/What happened, what we did about it, and the one thing I'd do differently next time.Tue, 21 Apr 2026 00:00:00 GMTretrospectivesdistributed-systemsplatform-engineeringobservabilityhttps://ko-wal-ski.pages.dev/blog/projects/second-brain/https://ko-wal-ski.pages.dev/blog/projects/second-brain/I replaced four SaaS tools with a folder of Markdown files and a weekly review script. Here's the layout.Thu, 02 Apr 2026 00:00:00 GMTprojectsplatform-engineeringgohttps://ko-wal-ski.pages.dev/blog/notes/cli-aliases/https://ko-wal-ski.pages.dev/blog/notes/cli-aliases/A short, opinionated list. Most of these are about saving a few seconds a hundred times a day.Sun, 15 Mar 2026 00:00:00 GMTnotes