I've worked for a year as a lead developer for this Start-up specialized in visual management. My mission was to develop a tool that would help teams share information faster thanks to big, interactive panels that directly interact with the information system.
This tool, Pingview had to be simple enough to allow anyone to create digital wallbaords and yet powerful enough to display relevent information from various sources, including APIs, relational databases, RSS feeds ... Dynamic wallbaords would be created by dragging elements in place, connecting them to the information system, and apply conditions to them so they could be hidden, shown, or change style based on the current informattion. In addition, Pingview includes powerful data transformation pipelines that can help extract the relevent data from various sources in the system.
This was my first attempt at using Vue, Scala and Akka in production. It told me a lot about how to use Akka clusters to build scalable services and how to deploy those Akka clusters. It was also the first time I had different tools in the the back-end stack, working together to achieve global performance. The communication between the node.js API and the Scala services was far from perfect. If I had to to do it again, I'd probably use a message broker such as RabbitMQ or Kafka. I would also use something like cats and emphasize on functional programming.