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I have read the overview of your requirement and the project seems very doable. We have delivered similar solutions - MCQs and score calculation etc.
However I need more finer details. Who uploads ECGs and as images? Will the options be fixed or need to be managed? For each ECG, the award algorithm will have to be defined? Which payment gateway do we integrate for one year subscription?
Complete details will enable me to assess scope of work precisely. I will revise / confirm my bid accordingly. Detailed specifications and inputs will also help me to make an informed commitment and deliver as required. It will help if we can discuss on chat also.
I ensure a very thorough job and also support if you need changes / enhancements in future. I look forward to hearing from you and working on the project.