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spack
A flexible package manager that supports multiple versions, configurations, platforms, and compilers.
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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.
If you're in the US, you could look for jobs in research software engineering (we have an organization called US-RSE). You can also look into jobs at the National Laboratories - super-computing clusters run GNU/Linux and a lot of the software tends to be FLOSS. At a smaller scale, research computing at universities and industry also can have a somewhat similar environment. I was a sysadmin doing my graduate assistantship at my university's high performance computing cluster and I loved it. Probably the project I got to contribute to most was spack.