C/C++/Java Expert: support us on building c/c++ code under MACOS

This is a test task to find the right partner for onging work on this topic.
Expected solution time: in a few weeks, we focus on quality-delivery & honest-estimation more than "quick & dirty" or "overseller"

Your task is to help us to build the evil side ;-) MAC (we provide linux+windows)
In the case you have to build a dll of pjsip for macOS x64 and ARM, along with the dependent libraries.
This libraries have to be loaded via java 17+

Examples of required work:
https://github.com/pjsip/pjproject/blob/master/pjsip-apps/src/swig/java/sample.java
https://github.com/pjsip/pjproject/blob/master/pjsip-apps/src/swig/java/sample2.java
https://docs.pjsip.org/en/latest/pjsua2/using/call.html)
So the app has to work on a desktop (macOS) and have to communicate with a SIP provider only. e.g https://www.sipgate.com/ (we will share you a fully working sip account after award)
Later (not scope here) ports to iOS/Android required too

your tasks will be to help to port a application to MAC

You need to implement for:
- mac x64 & ARM (a basic java best practice and requirement, ensure system independent development)

What are our requirements?
- your code passes checkstyle, pmd and spotbugs (we will share you a git repo with eclipse settings)
- JDK17
- maven
- runs on win, mac m1/intel, linux (later on android + ios)
- delivery in our git
- build on MACs are scripted (source fetching + building in bash scripts)

- preferably open source used build environments
- preferably, if possible cross compile builds to evict hardware needs of mac on CI build

What is our budget?
we do not disclose our budget nor planned hourly rate. Offer us your best bid.

Your bid?
Place your best hourly bid. We do not want to negotiate with you anymore after getting in touch with you.
So place your best bid to save time