I have rich experience used opencv in raspberry pi.
If you see my review, you can know.
My skill is following as:
Face recognition(Opencv, DLIB, Tensorflow(lite)...)
OCR(Opencv, Tesseract...), Plate number/Traffic sign recognition, Barcode recognition
Machine learning, Deep learning, Neural network(CNN, RNN...)
Video codec, WebRTC(H264/265, ffmpeg, Mpeg4, YUY2, CUDA...)
Database(Firebase, MySQL, Access, Excel, MSSQL...)
Multi-processing, Multi-threading