Note: Just read the first 2 to 3 lines of my bid.
For this work i have to write APIs of all three websites and integrate them in the software. In this way you can easily select the identical items, also you have to provide me list of products which you used to check through software.
Please see recent review regarding to JAVA from my professional clients
https://www.freelancer.in/projects/java/Java-program-run-the-implementation-30212681/reviews
https://www.freelancer.in/projects/java/Java-Program-30154928/reviews
https://www.freelancer.in/projects/eclipse/antlr-IDE-java-calculator/reviews
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https://www.freelancer.in/projects/software-architecture/Simple-simulator-stock-market-OODP/reviews
I did Masters in Computer Science, I have experience of 7 years in Java, spring java, Web Services, SQL, Apache CXF, hibernate, JSP, mirth connect and Electrical industries. I will do the work for you in a very good and elegant manner, assign it to me and I will deliver it very quick.