Myself nor nostr:npub1s3ht77dq4zqnya8vjun5jp3p44pr794ru36d0ltxu65chljw8xjqd975wz are probably not established enough for you to get credit here "Reputable Company" but myself and GitCitadel are working on C/C++ projects on nostr if you are still interested in contributing code.
My project noscrypt is a strict C cryptography library. I don't accept PR's on github only patches, I have a guide for it on my website
https://github.com/VnUgE/noscrypt
Open issues are found
https://www.vaughnnugent.com/resources/software/modules/noscrypt-issues?state=Defined
It needs help with hardware support as well, well really anything in the hardware department :)
nostr:npub1s3ht77dq4zqnya8vjun5jp3p44pr794ru36d0ltxu65chljw8xjqd975wz Is working on a C++ nostr development kit called Aedile, among another dozen projects (feel free to ask)
https://github.com/ShadowySupercode/aedile-ndk
We can probably accept GH prs otherwise we use our own managed git server
In either case, if your commits include your github email address your contributions should be mirrored to github if you make any.
Finally, my nostr DMs don't work (see my other project nvault as to why)