I have 6 years of experience working with various technologies and languages. Currently, I am most proficient at Website Design, and full-stack Android app development, using Java as front-end and Golang as the back-end because as of now Golang is the most efficient language as it offers great concurrency and is supported by all major APIs. I have experience with Stripe payment gateway integration, but can work with some other payment gateway as well if you have a specific preference. My choice of database would totally depend on the nature of the project, I can use MySQL, MongoDB or AWS DynamoDB accordingly, but for static files I use AWS S3. For hosting the back-end, I prefer using AWS EC2 Servers, either directly or through AWS Elastic Beanstalk and AWS Lambda. I also have experience with Heroku, in case you want your back-end to be hosted there instead. I am well-versed with Git, so you would be able to track the progress of the project easily.
P.S. I am new to this platform so initially I'll be charging less money for my work, just to get some work, but be assured the quality of work won't be compromised on.