HI, I read your needs carefully, I feel that I am very suitable for your requirements, I am a free software developer, I have plenty of time, I am very familiar with the development of java language, and have more than 15 years of java development experience, including spring , springboot, springcloud, restapi, etc. and a lot of data such as mysql, sql server, oracle, es, redis, mongodb, etc., and have done a lot of payment-related interfaces and integration experience, such as China UnionPay, China Telecom Operator Payment, WeChat, Alipay I am also very familiar with the system architecture, such as payment interfaces, and the installation and construction of nginx, tomcat, redis, mysql, etc. under commonly used Linux operating systems such as centos and ubuntu. I often use springboot as the background, combined with the go language, to make some flutter apps.
If you need, you can contact me through the system chat platform.
Thank you