With my extensive experience in both WordPress and Shopify development, I strongly believe I would be an excellent fit for your project. Throughout my 5+ years in the field, I've dedicated myself to crafting dynamic and responsive websites that not only meet but exceed the expectations of my clients. Conveniently, your project aligns with my expertise; besides a proficiency in key skills such as HTML, JavaScript, PHP and Shopify Templates, I have built various types of calculators similar to the one required by your project.
Regarding the desired calculator, I have created numerous percentage-related functionalities in various e-commerce sites. This includes both simple percentage calculations as well as percentage increase and decrease. These features are crucial when it comes to managing promotions, deals, and handling inventory.
On a practical note, I also satisfy all your logistics requirement; having previously developed projects on GitHub, deployed them with Netlify and successfully integrated them into Shopify should give you peace of mind about my compatibility with your desired coding environment. In conclusion, selecting me would guarantee you a committed, detail-oriented developer who will deliver high-quality work even under pressure in less than two days. Let's get started on transforming your vision into a fully functional desktop application!