AWS S3 Multipart Upload Function Development

I'm seeking an experienced AWS developer to create a multipart upload function for AWS S3. The function should be built using AWS Lambda and the AWS SDK, with Python being the preferred language.

Key Functionality:
- Initiating uploads
- Uploading parts
- Completing uploads
- Supporting parallel uploads
- Handling specific file format restrictions
- Allowing for file content preview

The ideal freelancer for this project would have:
- Extensive experience with AWS Lambda and AWS SDK
- Proficiency in Python
- Understanding of multipart upload processes in AWS S3
- Ability to implement parallel processing.
- Preferably speaking Chinese.