Website development for mutual fund distribution platform

We are here developing a mutual fund distribution platform where people can come and invest in different mutual fund schemes with the help of our platform and services. We need following skills in the interested freelancers : Backend languages prefered - PHP, Python, Java Knowledge of core language Knowledge of APIs (Restfull, SOAP) Problem solving skills Secure coding - should not have loophole in the code Considering multiple use cases Error handling Code optimization, discarding useless declarations of variables Scalability Ability to develop modern PWA (Serverless app) Knowledge of data caching on client's system Minimum use of third party libraries Ability to design efficient algorithm Should be able to come up with quick solutions Ability to developing user centric products Should understand user's problem and improve product quality Additional - Knowledge of image processing, video processing on server