Your portfolio can contain proof of your skills, samples, visual demonstrations of your craft and letters of recommendation along with your resume. Portfolios are commonly required during the hiring process for jobs in the art, design, publishing and tech industries.Your portfolio can contain proof of your skills, samples, visual demonstrations of your craft and letters of recommendation along with your resume. Portfolios are commonly required during the hiring process for jobs in the art, design, publishing and tech industries.Your portfolio can contain proof of your skills, samples, visual demonstrations of your craft and letters of recommendation along with your resume. Portfolios are commonly required during the hiring process for jobs in the art, design, publishing and tech industries.