I have vast amounts of experience in all the requirements you specified. I can not just provide you with a ditto solution, but can also provide knowledgeable insights.
Relevant Skills and Experience
I have vast experience in Freeradius, AAA, Hotspot solutions and worked on such products using it. I am not just a developer, but also someone who is passionate about the field.
Proposed Milestones
₹83333 INR - Captive portal, SMS and Payment Gateway
₹100000 INR - WiFi Hotspot Dashboard
₹70000 INR - Radius Server setup and configuration