As a seasoned C++ developer with over 15 years of experience and a solid background in software architecture, I can absolutely create the PDF viewer class you need for your Linux-based C++ application. Having worked extensively on projects involving data analysis and software development, I have the skills required to successfully develop and integrate the class into your existing framework.
Moreover, my proficiency in diverse programming languages including C/C++, C#, Python, MATLAB, VB and Java complements well with the unique demands of this project. Notably, my past projects have included building software solutions that involved processing, parsing, and extraction of various file formats such as XML, CSV, and JSON, which makes me perfectly suited to handle your requirement of opening and manipulating PDFs.
Most importantly, I'm impeccably efficient at meeting project deadlines without compromising quality. Given the limitations of your budget (250 USD), I assure you an exemplary output within your provided time frame. By entrusting this project to me, you can be confident of receiving a deeply customizable PDF viewer class that complements all your needs while elevating the performance of your C++ stand-alone app. Let's get started on building better efficiency together!