With my vast experience in full-stack development, particularly with Python, PHP, and JavaScript, I am more than qualified to take on your project which requires the creation of custom filters for your stock history website. Having closely worked with libraries like yfinance, numpy, and pandas previously, I understand their functionality and how to leverage them effectively for your needs. My proficiency with databases (MySQL, MongoDB etc.) will also ensure sound data management.
Moreover, I have developed a wide array of applications incorporating filters and conditional functionalities similar to what you’re seeking. This includes creating drop-down lists, managing filter conditions (in this case up to 4 conditions per filter), as well as enabling filter modification and deletion - all important aspects of your project that signify efficient organization and user-friendliness.
Overall, my diverse tech proficiencies in web development using Flask, Django; Mobile development with React Native, Flutter; Data Manipulation using Python Pandas, Numpy combined with my experience in working on similar projects fortifies my claim as the finest fit for your project. I am eager to collaborate with you on building these filters to empower the users' experience by allowing them accurate data filtering based on user-defined conditions.