Typically, staffing companies use ATS (Applicant Tracking Systems) to search for candidates nowadays, so make sure to include proper keywords in your resume. They need to be related to the industry and job openings.
Also, submit it as a Word document instead of a PDF because, in this way, it may be easier to read by the system.
Apart from that, it’s recommended to place the most recent project you worked on at the top, followed by your licenses and certifications.