What is When Notes Fly?
When Notes Fly is a high-traffic editorial magazine built for people who want to think better, learn faster, and understand the world more clearly. It publishes expert-authored articles across six main topic areas - Concepts, Culture, Explainers, Ideas, Technology, and Work Skills - each with ten structured subtopics, giving readers a systematic way to build knowledge rather than just browse content.
Beyond reading, the platform includes a practice engine that turns articles into interactive cognitive tests. Readers can test their understanding, track their scores across domains, and work through structured practice sessions that reinforce what they've read. This makes When Notes Fly more than a magazine - it's a learning platform with measurement built in.
The product was built entirely from scratch: custom CMS, subscription system, search engine, admin dashboard, payment processing, and a multilingual content architecture. Everything runs on infrastructure owned and operated by Kalenux, with no dependency on third-party CMS platforms.
What it does
Six topic areas, sixty subtopics
Content is organised into Concepts, Culture, Explainers, Ideas, Technology, and Work Skills. Each main topic contains ten structured subtopics, giving every article a precise home in the knowledge hierarchy and making the archive navigable at scale.
Cognitive practice engine
Readers can test their understanding through randomised question sets built from the article library. The engine tracks scores across cognitive domains, shows progress over time, and adjusts difficulty based on performance history.
Full admin dashboard
A complete content management system built into the platform. Authors can draft, edit, schedule, and publish articles. Admins manage categories, tags, users, messages, and subscriptions from a single interface with role-based access control.
Subscription and payment system
Integrated subscription model with payment processing, webhook handling, and automated email notifications. Subscribers get access to premium content, practice test history, and extended reading features.
Full-text search
Site-wide search across all articles, topics, and subtopics. Results are ranked by relevance with category filtering, letting readers find exactly what they're looking for across thousands of pieces of content.
Multilingual content architecture
The Kalenuxer build system supports publishing content in multiple languages from a single codebase. JSON data files per language, with automatic URL routing and SEO meta tags per locale.
Redis caching layer
High-traffic article pages and API responses are cached in Redis, reducing database load and keeping response times fast under concurrent traffic. Cache invalidation is handled automatically on content publish and update events.
Cookie consent and privacy compliance
GDPR-compliant cookie consent system with granular category controls - essential, analytics, and advertising. User preferences are stored and respected across sessions.
How it's built
When Notes Fly is a server-rendered platform with a Go/Gin REST API backend, a PostgreSQL 15 database, Redis for caching, and a Kalenuxer-built static frontend. The API serves article content, handles authentication with JWT tokens, processes subscription payments via webhooks, and powers the practice engine scoring. Everything is containerised with Docker and deployed behind Nginx on a Linux VPS.