You have not talked about how you want the front end presented ( except that password protected web application ), so I am a little concerned on how much work and polish you require on the presentation level.I have been a developer for over 25 years, most of them in web development with a special emphasis on data manipulation projects such as this. I can give you examples of aws based serverless applications such as you asked for with this. However, much of my recent work ( and reason I have not been active here for quite some time ) has been through an agency and for a long term contract with a multi-national advertising agency. As such, most of my projects were for internal use only. This corporation was almost entirely Amazon based ( EC2, S3, Lambda, Glacier, etc). Some examples include: A global employee lookup web service, A tool which semi-automated conversion of employee records from one HR system to a new system ( 40K+ employees in 37 countries ), Real Estate rehab tool ( which let you explore profitability of rehab projects based on acquisition costs, detailed rehab costs, and geo based market analysis ).
Look, I don't have much to show here on freelancer, but I have extensive experience in providing quality, professional solutions, literally hundreds of projects. With a specialty in data manipulation, web services and aws tools
Contact me to discuss this further and I promise you would not regret choosing me