I implemented Keras in Production in 2019 (Computer Vision Classification for Fraud Detection) in my previous employer and I got in touch with the current team,

I implemented Keras in Production in 2019 (Computer Vision Classification for Fraud Detection) in my previous employer and I got in touch with the current team, they are happy and still using it in production with small updates only (security updates). In our case, we made some ensembling with several small models using Keras. Our secret sauce at that time was in the specificity of our data and the labeling.