US state Geojson generation for state and zip code level

I am looking for a freelancer who can generate Geojson files for US states and zip codes. The project requires detailed data at the state and zip code level. Specific requirements for attributes or properties in the Geojson files are not needed. Standard attributes will be sufficient for this project. There is no need for the Geojson files to be compatible with any specific software or platform. Any standard Geojson format will work. Ideal skills and experience for this job include: - Proficiency in Geojson generation - Knowledge of US state and zip code data - Attention to detail in ensuring accurate and complete data - Familiarity with standard Geojson attributes and formats