Hello.
I am a senior MERN stack developer and have 4 years of experience in this field.
Reading your post I found myself perfect match for your job due to my career and experience.
I am very familiar with different frameworks of node js such as express, koa, strapi, node-red and so on.
Also I am good at react js front end building with material, bootstrap templates also with sophisticated redux and Apollo structure.
MongoDB is the must for the MERN stack development, and I am very good at queries, filters, and other management skills.
Due to my experience and skills in this field, I will bring you the perfect result in time.
Hope we can have chatting or call to discuss more about your app and the budget, timeline.
Best regards.