Salesforce developer needed for short term project

Non-profit organization looking for a Salesforce developer (Apex and Visualforce) to assist with a short-term project to fix an issue where Apex code from an old form is linking the contact records and preventing any manual changes to be made to those contact fields. Additionally, we'd like to update or create a new form for future use. Data from the form needs to populate the contact record and custom objects, but still allow for manual entry and override. Other Salesforce-related projects are needed and can be discussed after successful completion of this initial project.