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Akka.net
Canonical actor model implementation for .NET with local + distributed actors in C# and F#.
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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.
Spring and Hibernate are the goto libraries in Java land and I suspect that's the primary motivation for your colleague's recommendations. It's quite easy to bulldoze someone less experienced with your ideas so be careful of that. I'd avoid both. They aren't bad libraries at all but they have a 'legacy' feel and it will make your application less future proof. Would a distributed system be viable? If so then I'd recommend Akka, there'a .NET port of it that's well supported and maintained.