Complete Sprinkler Design Software

My in-house, trademarked application already drafts sprinkler layouts, calculates total square footage, and produces job-ready reports, but several rough edges remain. I need a developer who can jump into the existing codebase and help me take it over the finish line... (Budget: $30 - $250 USD, Jobs: Backend Development, Database Management, JavaScript, Mobile App Development, MySQL, PHP, Software Development, Software Engineering)