19 system-design cases thread

Thread author Neo Kim publishes the compilation from his Substack account "The System Design Newsletter" and first shared the curated list as a social post on Feb 13, 2026. (substack.com) The newsletter's public profile shows a claimed audience of roughly 0.5M+ across platforms and more than 227K free subscribers according to directory tracking. (substack.com) (sidestack.io) The publication runs frequent, numbered issues (e.g., #133 on Mar 23, 2026 and #134 on Mar 24, 2026), and the archive lists dozens of deep-dive posts that expand the short social-thread entries into multi-paragraph technical explainers. (newsletter.systemdesign.one) System Design One maintains a YouTube channel with approximately 13.2K subscribers and a playlist of short case-study explainer videos that parallel newsletter topics. (youtube.com 1) (youtube.com 2) Community projects and teaching repos have mirrored and implemented many of the lessons: the "system-design-academy" GitHub catalogs dozens of case-study entries with recent commits, and multiple public repos provide implemented code and project templates. (github.com 1) (github.com 2) The author markets a free downloadable "system design playbook" alongside a paid "Interview Academy" membership; public directory listings show paid tiers at roughly $17.50/month or $150/year. (newsletter.systemdesign.one) (sidestack.io) Third-party thread readers and aggregators have reposted the compilation to broaden reach, with copies archived on Thread Reader and UnrollNow within days of the original post. (threadreaderapp.com) (unrollnow.com)