Make a relatively simple application, say an async video chat app. Build it with 'micro'services for everything (e.g. thumbnail generator, contacts, groups, sen

Make a relatively simple application, say an async video chat app. Build it with 'micro'services for everything (e.g. thumbnail generator, contacts, groups, sending, receiving, email/sms notifications). Deploy all of them in containers with redundancy and use a distributed datastore in VMs (to simulate separate machines, run some of them in different timezones). Alternatively, try running Elasticsearch to index something.