Suggest appropriate tech stack and development services

Hi I am 22(m) and non engineer with good knowledge and interest in finance especially wealth management and roboadvisory. I want to build a platform for wealth management/ pension planning/ roboadvisory for india I want advice regarding how to build a platform that can be hosted online and would do complex calculation. Key features 1. Enable users to make portfolio selection across ranges of ETF / mf and stocks/ bonds and find key mixes (max sharpe) + for aggressive, moderate and conservative portfolios 2. Help users do backtesting of the portfolio along with 100s of key financisl ratios and metrics 3. Along with that I have a plan to implement ml in it across 100s of metrics where the system would keep on testing portfolios to find which key ratios actually are most associated with high growth portfolios. 4. An ai base sentiment analyser which would suggest better decisions on investment prior to events so before us election it should analyse and tell that tesla will grow if trum wins (would require human inverntion) 5. A retirement planning based on goals of individual and suggesting different plans 6. Roboadvisory sevice for time crunch investors This is what I have thought in broad terms. I am very hands on into coding and take help from ai (did a python 10y portfolio optimization project in college) but buiding somthing reliable requires advice from y'all Please don't tell me to focus on one thing and other stuff. Please tell in detail what tech stacks high end financial companies use and what should I do. Additionally if someone is interested and would love to develop this project together feel free to dm me 🙏🙏 In my POV wealth management would boom in next decade with most unicorn from here... Edit: Assume I don't have a lot of knowledge about big systems and/or suggest me best way in simple terms. Like first do this then this and so on