Hello,
Please see some of my previous projects on my freelancer.com portfolio : https://www.freelancer.com/u/chromenickel in " Html5 / Css / Javascript applications " category.
I can develop that project with precise results. I didnt use CuraEngine before and i checked it now. It seems quite doable. At least lower than 20% error is ok.
I have at leas 10 years experience on 3d modeling, machining, product design and mold making. I have strong knowledge about g-codes and how 3d printers works. I have a 3d printer too.
I can generate a software from scratch too. I would like to talk on more details like where you want to use this software.
I can make it both for desktop and web. ( windows, linux and raspberry pi are ok. I dont have a mac computer )
I would like to work on it.
We can start with a small milestone, and if you see positive results, we can move next, or i will accept to let you back that first milestone.
Please check that milestones i provided by this proposal.