Can you understand the problems with having the treasury pay for closed source code?
You cannot go to the treasury to be funded, and keep your code closed source. If the treasury has funded it, it becomes a public good, and must be accessible by everyone. If you want to create a proposal which retroactively compensates you for 3 months, you must provide a GitHub.
Relevant:
Is the Treasury Polkadot's Biggest VC?
Additionally, without an open source repo, there is no way to audit your claims about the time it took, the code being your own, etc…
Regarding 2 developers, it is your job as the proposer to provide the developers, but I can make suggestions that the Polkadot Blockchain Academy generates lots of high quality developers who should be able to do this kind of work. You can post a job listing here:
But do you also see the concern of pre-funding you for two engineers that literally do not exist yet?