I have done similar works for another clients, for example:
https://www.freelancer.com/projects/software-architecture/information-retrieval-software/
Relevant Skills and Experience
I think it is fine to use R for your work.
I've completed several courses of Data science specialization at Coursera, for example: R programming, Getting and cleaning data.
Proposed Milestones
$50 USD - 1 milestone
Please, send me the whole task with pdf-file and example in Excel.
Thank you in advance.