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stivale2-barebones
Discontinued A simple stivale2-compliant kernel and build system example/template.
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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.
I'm in a very similar position to yourself, so perhaps take this with a grain of salt, but I think the limine bare-bones tutorial is the best starting place. If you visit the github page, they suggest a list of features to implement in a certain order: https://github.com/stivale/stivale2-barebones
The BOOTBOOT loader is a good example of a boot loader that can be configured to run either as a first stage (loaded by UEFI or BIOS) or to run directly after GRUB. https://gitlab.com/bztsrc/bootboot