Enhance Salesforce Apex Test Classes for Coverage

I have several Apex test classes that require an experienced developer to enhance their code coverage from over 65% to beyond 75%. The focus is primarily on controllers, with critical functionalities to verify including CRUD operations and SOQL queries. The test classes also need to handle specific scenarios such as bulk operations and data setup and teardown.

Ideal Skills and Experience:
- Proficient in Apex programming language
- Extensive experience in writing and optimizing test classes
- Strong understanding of Salesforce architecture
- Familiarity with CRUD operations and SOQL queries
- Experience handling bulk operations and data setup in test classes