Market Data Integrator: Consuming Real-Time Data with Python, MongoDB, and Kafka

A Python 3.12 microservice ingests real-time Brazilian stock market data from the Brapi API for a watchlist of 50 assets, persists historical payloads in MongoDB, and publishes price updates to a Kafka topic. The asset ticker is used as the Kafka message key to guarantee per-asset ordering within partitions, preventing race conditions in downstream consumers.