The frontline API is proxied through a HAProxy load balancer with NGINX as the fronted, which also handles SSL termination. This frontline API consist of 600 stateless endpoints that join together multiple services.

As part of the Marketplace stack, engineers in this area integrate with various other internal services, including logtron to log to disk and Kafka and uber-statsd-client, the Node.js client for statsd.

The Uber Engineering Tech Stack, Part II: The Edge and Beyond | Uber Engineering Blog (
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