Scholarship / From technical, through marketing, to the development team. Work Experience - Chevening Application [2]

Hi everyone! I need help to correct grammar mistakes at my answer about work experience. Thank you a lot!!!

Text 1:
From January 2012 to March 2015, I worked at the technical team from XXX Group. The team main purpose was the stimulation of the steel construction in Brazil with focus in rolled steel profiles.I started working as a trainee and after two years I was promoted to technical consultant. During three years I worked at XXX city with more four engineers. My main activities was:

-Provide technical assistance and consultation to specifiers, architects and engineers on use of steel profiles.
-Developing technical materials on steel construction area.
-Hold lectures, workshops and training courses about profiles steel and its applications to company's sales force and clients.
-Participation in academic events at universities and technical schools, giving lectures about steel construction and the product.
-Participation in fairs and events of civil and steel construction sector.
-Development of the use and application of the steel profiles at the various segments of civil and industrial construction.

Text 2:
From March 2015 to October 2016, I worked at marketing team from XXX Group. I worked at the team responsible for steel profiles market development. My main activities was:

-Developing the business plan to market and sales of the product steel profile.
-Trade policy management, competitiveness, profitability and market share.
-Participation in strategic projects.

As october 2016 I became part of the product development team. I was responsible by the steel products: nails, rebar and profiles. My main activities was:

-Monitoring the products performance
-Relationship with productive areas from all industrial plants and clients.
-Assessment and monitoring of sales results
-Participation in strategic projects to development of new products and applications.