I've come across a brief overview about a Canadian sales representative that says :
I grew-up in a family business specializing in short-term rental accommodations. Our resort, Tyrolean Village Resorts, was built by my father and uncle in the 1960’s and is now managed by my brother and I. This unique experience has helped me developed my 15-year real estate career in selling and buying short-term rental accommodations and working through the requirements to establish and operate such properties in the area.
I've noticed that he used "present perfect and past simple at the same time" ( has helped me developed ).'
I'm wondering, what is the grammar rules used here? and if I were to change it to "has helped me develop", would the meaning change?