If you have ever seen or used a self checkout at Walmart, Target, etc. This is something I worked on. The latest versions are Linux based and a microservice architecture...I was involved in that modernization. I worked across a diverse variety of languages: C, C++, Java, Go, and JS...effectively working up and down the entire stack.
A few highlights I suppose...I worked with the platform team on debugging application to kernel\driver specific interactions. I worked on optimizing and debugging virtualized implementations for edge compute servers. I wrote custom tooling performance analysis in V8 to analyze the interactions the interactions with the C++. Was the engineering lead for the automation on the product so all the automated testing (I personally barely wrote a single test)...I wrote the libraries for testing, tools for tracing application behavior, k8s integrations to make it scale, worked with multiple service teams for emulation of hardware\components, and the CI\CD pipelines for the services. And of yes...I worked on the implementation of the document\receipt parsing so if you have ever held a receipt in your hand from a self checkout system you are holding something I worked on.
Honestly, I'm proud of the work done during my time there.