As an experienced developer with over 7 years of experience specifically in web and mobile development, I believe I possess the level of proficiency that your project demands. My wide-ranging expertise with programming languages such as C++, JavaScript and PHP, combined with a mastery of software architecture and SQL, makes me well-equipped for refining and rectifying errors in your cash register software.
Throughout my career, I've consistently demonstrated an exceptional ability to identify system malfunctions and improve performance. My keen eye for detail combined with a creative problem-solving mindset has contributed significantly to enhancing not just functionalities but also the overall user experience of various systems - skills which are paramount to the success of your project.
Moreover, my comprehension of SQLite, MySQL, MongoDB, and MariaDB coupled with my extensive work with expressive frameworks such as Laravel, Vue.js, Yii, Codeigniter allows me to pinpoint and resolve data inconsistencies effectively. Therefore, by hiring me for this project you can rest assured that you're putting your software into highly experienced hands for a robust and user-friendly final product.