With my decade-long experience as a Full-Stack Developer, I'm confident in my ability to tackle and conquer the nuanced challenges you're experiencing with Crocoblock Jet Engine. Your emphasis on filtering, category selection and hierarchical setup finds me poised to provide solutions that will resolve these issues in a timely manner. Additionally, I commend your intent to learn from me- which I appreciate fully; rest assured, I'll guide you through the puzzles and will await your questions.
In regard to exploring relations and options - I believe there can be room for optimization and streamlining processes within your website. My proficiency in HTML, JavaScript, PHP, and deep rooted knowledge of WordPress should cover those bases impeccably. Alongside, my database skills go hand in hand with Jet Engine’s query builder for enhancing performance and managing data resiliently.
Lastly, time is of importance - but not at the expense of solutions and clarity. The timeframe may be short but fret not, I strongly commit to nurturing a long term association with my clients where they can approach me with any problem or concern even when the project has concluded. I value simplicity in software design as it not only enhances its maintainability but also empowers the end users - like yourself - to troubleshoot independently. Let's embark on this journey together and make your classified ads website a grand success!