Semicolony
semicolony.devLong-form guides and simulators for how systems actually work.
Education & Learningdistributed-systemssystem-designinteractive-learningnetworkingsimulatorsengineering-educationbrowser-tools
About
Semicolony is a self-study platform for systems engineering covering topics like DNS, TLS, Kafka, Kubernetes, and distributed systems. It pairs long-form technical guides with interactive, browser-based simulators so readers can observe system behavior hands-on. The site also offers reference volumes, interview prep tools, and single-purpose browser utilities — all human-written and client-side only.
Problem
Engineers struggle to deeply understand complex systems like DNS, Kafka, and Raft from text alone, without being able to experiment with them interactively.
For
Software engineers and students studying systems engineering, distributed systems, and infrastructure
How it works
The site pairs long-form written guides with hand-built browser simulators that let users interactively probe system behaviors, alongside reference shelves, flashcards, and single-purpose utilities that run entirely client-side.
Business model
free
Status
launched