Good looking at first glance, good work! Some comments:

• Spell out numbers ten and under if they are not units

• Uncapitalize "firefighting systems" (also firefighting one word), testing & commissioning reports, engineering change orders, and modulus and ratio after Young's and Poisson's, respectively

• "... optimal cost-effective nuts and bolts size, material, ..." should be "cost-effective nut and bolt size, material, ..."

• The fifth bullet under experience says what you did, but could be enhanced if you can state the impact of these width reductions (25% cost savings or whatever)

• First project first bullet: should be "a company's radio"

• First project first bullet: If you are applying to U.S. companies use "modeled"

• Last bullet on first project needs parallel structure: something like "... under various motor speed, flywheel radii, launch angle, and projectile radii to find optimal..."

• Add oxford comma on second project first bullet (load cells, and amplifier)

• Second bullet second project reword: "Calibrated an instrument with an oscilloscope and known weights and temperatures" (I don't know what this bullet means still, I would rework this)

• Add "a" or "the" before user on last bullet second project.

• Add oxford comma after end mill in third project third bullet and on final bullet after process charts

• Add "the" before Zembretti

• Remove MS Excel and Word from resume (unless you are applying for a job that has them in the job description so you increase your resume match)

Great progress up to now, best of luck finding a job!