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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.
There are multi purpose language and frameworks. Choose one that has been on the market for a while and will remain for a while. And try to be perfect on it. Start a pet project, keep adding as many features to that single project. Deploy it to some cloud, scale it, write tests, write load tests, try using best programming practices etc... if you're out of ideas try something similar to this https://github.com/GT-Corp/myths-and-facts-about-programming/blob/master/full-scope-developer.md
NOTE:
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Hence, a higher number means a more popular project.