add Transformer encoder after VGG-16

I am looking for a skilled developer to add a Transformer encoder after VGG-16 in order to perform object detection on a custom dataset. The ideal candidate will have experience with deep learning frameworks and object detection algorithms. Specifically, the project requires:

- Integration of Transformer encoder after VGG-16 for object detection
- Use of custom dataset for training and validation
- Implementation of appropriate deep learning frameworks and object detection algorithms

Please note that the number of layers for the Transformer encoder was not specified.