Architecture and initial development for Journey Of Safety. PWA + http2 REST API with JWT authentication, event streaming with Kafka or Redpanda, microservices, docker, MongoDB, Scaleway Object Storage (AWS compatible), Bunny.net global caching, JavaScript anywhere, Deno (NodeJS successor) in the backend, lit (lit.dev) for creating reactive web components, html, css, docker desktop, Kubernetes, CI/CD with git and gitlab, and more. Domain devices are microservices that can produce and consume events. Two-way communication with the API which also consumes and produces. The PWA is 'offline first'.