Django, fintech, hardware, cloud infra — from 13+ years in the trenches.
How I built a crowd-adaptive music system for retail using an ESP32, an RD-03E mmWave radar, a Flask state API, and a mood engine that maps crowd density to BPM and genre, without a single camera or microphone.
How I built a proof-of-concept using AWS CloudHSM and PKCS#11 to demonstrate AES-256 encryption where the key never exists in application memory, verified with a live forensic scan of the Flask process.
I said no to FAANG, took a pay cut to join a startup, and spent six months 'unemployed' after an acquisition. Here is what I actually learned from each of those decisions.
A deep dive into NGINX's event-driven architecture: how the master-worker process model, epoll, non-blocking I/O, and upstream connection pooling combine to serve massive concurrency without the thread-per-connection overhead that Apache could never escape.
Most Django payment integrations handle the happy path well. This post covers what actually breaks in production: webhook idempotency, signature verification, and async reconciliation.
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