The roles and responsibilities of a packaging developer can vary depending on the company or industry, but some common tasks and duties may include:

1. Developing new packaging solutions: A packaging developer is responsible for designing, testing, and developing new packaging solutions that meet the needs of the product and the company. They must consider factors such as product protection, cost, shelf-life, and consumer appeal.

2. Collaborating with cross-functional teams: Packaging developers often work closely with cross-functional teams including R&D, marketing, operations, and supply chain. They must be able to communicate effectively with these teams to understand their needs and incorporate their input into the packaging design.

3. Conducting packaging trials and testing: A packaging developer must conduct packaging trials and testing to ensure that the packaging design is effective and meets quality standards. This may involve conducting lab testing or running pilot tests in a production environment.

4. Ensuring compliance: Packaging developers must ensure that their packaging solutions meet all regulatory requirements, such as those related to safety, sustainability, and labeling.

5. Managing packaging suppliers: Packaging developers are often responsible for managing relationships with packaging suppliers, negotiating contracts, and ensuring that the quality and delivery of packaging materials meet company standards.

6. Continuous improvement: A packaging developer must stay up-to-date with the latest trends and developments in the packaging industry and continuously seek ways to improve packaging solutions and reduce costs.

Overall, the role of a packaging developer is to design and develop effective packaging solutions that meet the needs of the product and the company, while ensuring compliance with regulatory requirements and minimizing costs.