Blockchain | Flashbots solution Project: Implementing feature that bundle transaction can be sent to block.

I'm looking for expert Ethereum developers for my Flashbots project.
Actually, I have got one project that have stopped just before due to my poor previous developers.
It is flashbots project that have to be implemented feature that send transaction bundle to Block. I have got feature that sending transaction bundle when some buying transaction occurred but it has some errors.
The current implementation allows for purchasing but lacks a selling feature. Your task will be to create a feature that sends transaction bundle to the Block in buying feature. If you complete it perfectly, you will continue implementing selling feature.
If you give me the correct solution for the first issue, I will consider you more than the others.

Provide me your previous experience and portfolio of this field if possible.
I will choose only 3 members and organize one team with them for my project. Budget is less than $50 hourly. If you think that this budget is not reasonable, don't contact me!

Important points:
- The selling feature must be manually triggered by the user.
- The user will execute this manual trigger through a command line interface.

Ideal skills for this job include:
- Extensive experience with Ethereum and Flashbots.
- Strong command of command line interface.
- Proven track record of developing blockchain solutions.