Moin Sven,
willkommen im BLF und viele Grüße aus Berlin, was ja - in BLF Dimensionen - quasi "umme Ecke" ist. :-D
It's good to have you here. Moreover, someone with your skills and interest into flashlight firmware coding will certainly be of great value here.
If you like you may want to check out one of our latest projects, the Sofirn SP10S BLF edition with Andúril.
https://budgetlightforum.com/t/-/56521
It will be 14500 flashlight, intended to run both with 3.7V Li-Ion battery and 1.2V NiMH battery by using an appropriate boost driver. Some of our best driver experts here are working on it already.
Enjoy and have a wonderful time here! :-)
Cheers,
Thomas