Trading Systems
Building Reliable Trading Automation: From Script to System
A practical architecture for trading bots that survive retries, stale data, partial fills, restarts, and exchange outages.
11 min read
Field Notes
Engineering systems that handle real constraints
Original notes on trading automation, API economics, failure handling, and the operational decisions behind small software products. Written by johnnyji from implementation and production experience.
In-Depth Articles
Product Engineering
How to Budget an API-Powered Side Project Before Launch
Build a usage-based cost model that includes retries, background work, observability, free-tier cliffs, and growth scenarios.
10 min read
Practical Guides
DCA vs Grid Trading
A practical comparison of dollar-cost averaging and grid trading, including their risk shapes, automation requirements, and failure modes.
Trading Fees and Break-Even Price
How entry fees, exit fees, spreads, slippage, and funding change the real price at which a trade becomes profitable.
Budgeting API-Powered Side Projects
A budgeting checklist for side projects that depend on paid APIs, background jobs, hosted databases, and serverless platforms.