Take a look at nostr.net for some existing projects. There aren't many C/C++ projects yet, but were betting there will be I sort of have an embedded background in old automotive processors, mostly binary editing and disassembly, but I have a long list of projects you may be interested in I mostly write C, C++ and C# libraries (over 500k lines of code in my repos)

GitHub

VnUgE - Overview

Building software I shouldn't be. Low-level and server engineer - VnUgE

- C low-level cryptograhpy library

GitHub

GitHub - VnUgE/noscrypt: A nostr specific cryptography library written in C

A nostr specific cryptography library written in C - VnUgE/noscrypt

- C++ nostr sdk

GitHub

GitHub - ShadowySupercode/aedile-ndk: C++ System Development Kit for Nostr

C++ System Development Kit for Nostr. Contribute to ShadowySupercode/aedile-ndk development by creating an account on GitHub.

- C# low level utility libraries (for server app development) -

GitHub

GitHub - VnUgE/VNLib.Core: High performance server application utility libraries

High performance server application utility libraries - VnUgE/VNLib.Core

- C# full stack server + browser extension for nostr nip07 -

GitHub

GitHub - VnUgE/NVault: A self-hosted, multi-user, nostr credential vault, with cross-browser NIP-07 extension

A self-hosted, multi-user, nostr credential vault, with cross-browser NIP-07 extension - VnUgE/NVault

if you visit https://www.vaughnnugent.com it is served to you using my http framework and web server software :)