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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
How do you feel about blockchain tech? Good growing field to have experience in. You could parse some data from a blockchain and serve it through a block explorer, or develop a monitoring tool for chain analytics that plugs into a node. Neo is developed in C#, might be worth a look at the neo-modules if you fancy that route.
There's a boatload of open source stuff you can read and contribute. Try this https://github.com/quozd/awesome-dotnet#api
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