I have previous experience with nodejs/electron, mongodb, html5 and the lot.
From my understanding of the task description, i can definitely send response data from local server to central server and run analysis of data.
Will this include collating form data or is this already done? I.e. do you already have part of the system built.
I'm not a big fan of bullshit. I've estimated about 10 hours of work in this. If it takes less than 10 hours, I will charge 1700 INR/hr charged up to nearest hour rounded up. If the code quality and documentation is good, I don't expect it will take the full 10 hours. I expect clear description of tasks involved and timely access to documentation, data, servers, and anything else I'll need so I don't waste time waiting.
I estimated for:
* getting familiar with project and getting it up and running with sample data or connect to test server: ~2h
* implement upload feature to central server: ~1-4h depending on actual details
* implement data analysis feature: ~1-4h depending on actual details
If you like my work, and I like the system, I am happy to continue further work.