I built a self-hosted algo-trading stack in Python — backtest to live, no black box

Every "algo trading platform" I tried made me pick one of two bad options: A hosted black box — upload your strategy to someone else's cloud, run it on their runtime, pay a monthly fee, and hope their fills resemble reality. Roll your own — weeks of plumbing (broker APIs, data feeds, order lifecycle, risk management) before you place a single live trade. I wanted a third option: bring my own Python strategy and run it on infrastructure I control — my machine, my broker keys, no cloud lock-