Send me your resume or Statement of Purpose and I'll give you honest, specific feedback, not vague suggestions, but line-by-line notes on what's working, what's not, and exactly what I'd change.
For resumes, I'll look at:
For SOPs (especially OMSCS applications):
You'll get a commented document back within 48 hours — something you can act on immediately, not just feel good about reading.
Drop your document and a line about what you're applying for. That's all I need.