Senior Software architect with CodeIgniter knowledge for proof-pf-concept needed.

Please read this carefully before applying! We are looking for a senior software architect for a proof of concept for our web application. Currently we are testing several layouts, but need help with feasibility and procedure for the solution. Part of the system and our preferred platform is CodeIgniter, therefore we need an expert here. We have several system elements and ideas, which need to be integrated in a comprehensive, visualized concept. The task is to check our draft requirements (front and back end), proof the concept, and suggest the most efficient way forward. This includes proposed technology, back end data structure, UX/UI, hosting solution, programming languages and a suggestion how to install a sandbox (testing environment). Please be prepared to discuss your proposed concept with us. A high level estimate of effort per development area is also required. In addition, a suggestion of work packages and milestones should also be drafted. Output: reviewed, extended requirements document (ready for quotation), visualized software concept, list of technology used, description of interfaces, database structure, suggested development procedure, proposed milestones, cost (hours) estimate. Please provide details in with your preferred procedure for the deliverables. This is a pure concept phase, but we need it programmed as well later on. So this could be a longer relationship, if successful. We are looking for full stack senior experts with 8+ years’ experience in the mentioned technologies. Knowledge with SaaS is very much appreciated. To show that you actually read this brief, add „understood“ to your offer. Target budget is under 300 USD, but depends on experience level.