Redis is the swiss army knife in our toolbox. Some of our microservices have internal job queues powered by Redis. Other microservices use Redis as a write aside cache. We also take advantage of things like HyperLogLog and Bloom Filters for high cardinality data problems. Redis does it all.
Being a very small engineering team, the thought running something like Kubernetes is frightening. Luckily, Amazon EC2 Container Service is a perfectly capable container scheduler that is very easy to work with, and the Terraform ECS providers are rock solid.
Almost everything in the Merryfield architecture runs on Docker. From dev/prod parity, to seamless autoscaling of service containers, Docker solves lots of problems.