System design

Building a notification orchestrator: a decision log

Building a notification orchestrator: a decision log

By Carl EubanksThis isn’t a copy‑paste tutorial. It’s a behind‑the‑scenes look at why I chose a specific shape—hexagonal micro‑orchestrator on SNS → SQS—for a cross‑channel notification pipeline, and the trade‑offs I wrestled with along the way. Problem Statement ...
ENGINEERINGSYSTEM DESIGN
Design bit.ly

Design bit.ly

By Carl EubanksFor each portion, I’ll regurgitate the feedback I received. Each system design interview is different, so it’s interesting to see how hellointerview has tailored their AI feedback system. Requirements Functional requirements Users should be able to ...
SYSTEM DESIGNTECHNICALLY
Caching: The bikini bottom marathon

Caching: The bikini bottom marathon

By Carl EubanksWhat is caching? Caching is the practice of storing something in a location from which it can be quickly retrieved, thereby speeding up future accesses. It's not always permanent--it's more of a short-term memory for whatever you might need really so...
TECHNICALLYCACHING