E-Procurement Web App Penetration Test

I run a custom-built e-procurement platform (PHP, Bootstrap front-end, MySQL) hosted on a private AlmaLinux VM and administered through DirectAdmin. Before pushing new features live, I need a thorough penetration test that zeroes in on web-application weaknesses... (Budget: $30 - $250 USD, Jobs: Bootstrap, HTML, Linux, MySQL, Penetration Testing, PHP, Risk Assessment, Security Auditing, Technical Documentation, Web Security)