Hey! I am a senior PHP developer; this is the first time I have heard about Outsystems. I have already checked out their documentations; it looks simple enough. I have an excellent understanding of CSS, MySql, and Javascript. If I commit full-time, I can start coding for you in Outsystems within 7-10 days. Accounting modules are my specialty, already built multiple for Biman Bangladesh Airlines. Do let me know if the timeline is acceptable to you.
I am at your disposal.
Kindest regards,
Danyub