As an experienced developer, I'm confident that I can create a top-notch GST billing software using either PHP or Node.js, tailored specifically to meet your needs. My adeptness in C# Programming, JavaScript, Node.js, PHP combines well with my extensive skill set with Excel. These skills allow me to perform complex data calculations, automating repetitive tasks, and creating powerful reports - all essential for your project.
Moreover, my competencies extend beyond development as I have experience navigating the GST system and understanding its intricate billing requirements. I'm not just concerned with invoice generation and GST calculation, but also appreciate the need for inventory management and expense tracking, two features you've noted as important.
To corroborate my claims, I've successfully developed similar software in the past that leveraged my Excel skills to create user-friendly systems capable of handling large volumes of data while maintaining accuracy and efficiency. I would welcome the opportunity to infuse this talent into your project and deliver a GST billing solution that will streamline your operations in record time.