Notes

Notes from the work.

Short, practical write-ups from building trading platforms, payments and apps.

4 Oct 20264 min readBuilding on the MetaTrader 5 Manager API: five lessons from a real-time risk monitorWhat I learned building a C#/.NET service on MetaQuotes' MT5 Manager API for a prop-trading platform: pumping, thread safety, verification and safe deploys.
4 Oct 20264 min readPayment webhooks that never double-credit: signatures, idempotency and reconciliationA practical checklist for card, wallet and bank payment callbacks: verify signatures, process each event once, survive retries and out-of-order events, and reconcile.
4 Oct 20263 min readChanging a message between two services: why the consumer ships firstWhen two services talk through RabbitMQ, a new field can be silently dropped. How to find where it disappears, and the deploy order that keeps both sides working.
4 Oct 20263 min readHow I use AI coding assistants without shipping their mistakesAI assistants such as Claude Code and Codex speed up exploration, boilerplate and review. These are the habits that keep their confident mistakes out of production.
4 Oct 20264 min readOne app, two app store rulebooks: shipping a Flutter marketplace on Google Play and the App StoreLessons from releasing a Flutter app on Android and iOS: Apple's in-app purchase rules, platform-aware pricing, push notifications, old app versions and deep links.
4 Oct 20264 min readHow prop firms enforce daily loss and max loss rules, and why timing mattersA plain explanation of prop-firm challenge rules (profit target, daily loss, max loss, consistency) and what it takes to enforce them in near real time.