My Backtest Lied to Me. Here's How I Caught It
If your live bot doesn’t match your backtest, your backtest is fiction. Here’s the comparison tool I built and the bugs it caught.
Engineering
STOP_MARKET vs STOP_LIMIT on Binance Futures: Why Market Stops Are Stealing Your Money
STOP_MARKET is the default stop loss on Binance Futures. It’s also silently eating your profits through slippage. Here’s exactly how much it costs and how to switch to STOP_LIMIT.
WebSocket vs REST API: I Deleted 150 Lines and Nothing Broke
I spent weeks building a WebSocket price feed. Then I realized I didn’t need it at all.
The Timezone Bug That Cost Me 9 Hours of Trades
My bot was missing every trade for the first 9 hours of each day. The cause? Mixing UTC and KST in one line of code.
Binance API Gotchas That Will Waste Your Weekend
A collection of Binance Futures API quirks that aren’t in the documentation. Each one cost me hours.
The 3 AM Bug: PID Lockfiles and Duplicate Processes
My bot was running twice. Two instances, same account, doubling every order. Here’s how PID lockfiles saved me.