Web Designing -- 2

Web page designing for a specific requirements for our firm Details: not completely static website but rather few dynamic items as well as storing data securely. Need to create a finance planning page, where customers can enter their inputs like their current monthly income and based on their plan lets say house purchase plan we should we able to calculate by given time how much money need to be saved every month. Additionally we will tell where exactly this money needs to be invested. The calculation part of this will be provided to the designer. We want to provide planning for important things like house purchase , retirement planning, self marriage or kids marriage planning, holiday planning, education planning etc. Looking for people with full stack exposure or expertise on REACT or any other tool exposure Security is most important factor . Any data needs to stay on our server, to be stored securely and noone should be able to make security breach. Please revert back if you have done similar work. Please share a link of your past work for our reference.