A reputable provider of Software Product Development Services should offer a comprehensive set of key security features to ensure the integrity, confidentiality, and availability of the software being developed. These features include robust authentication and authorization mechanisms to control access, encryption techniques to protect data both at rest and in transit, secure coding practices to mitigate vulnerabilities, regular security assessments and audits to identify and address potential risks, and incident response plans to swiftly handle security breaches. Additionally, adherence to industry standards and compliance with relevant regulations further enhance the overall security posture of the software development process.