It isn’t surprising that Silicon Valley hiring seems to favor large west coast universities (esp. if you only look at raw numbers not percents). Most top LACs are concentrated in the east and midwest. What would we see if we normalize for school size, look past the top 10 feeders, and look at other hiring centers besides Silicon Valley (such as Boston/Route 128, Baltimore-Washington, or the NC research triangle)? Anecdotal reports and college web sites suggest that top LACs do pretty well in CS career outcomes.
https://www.macalester.edu/academics/mscs/aftermac/ (recent CS/math grads at Amazon, Google, and Microsoft … but also at local/regional employers such as the Mayo Clinic, Epic Systems, AppFirst, Code42)
https://www.cs.swarthmore.edu/people/alumni.html (recent CS grads at Google, Venmo, Etsy, Mathworks, Nest,Facebook, Morgan Stanley … and in graduate school programs at Cornell, CMU, Princeton, UMass-Amherst)
https://csci.williams.edu/people/alumni-directory/ (recent CS grads at Google, Amazon, Ebay, IBM, Deloitte, Epic Systems, Lawrence Livermore, McKinsey, Goldman Sachs, BBN … Princeton, Harvard, Berkeley, Stanford, Cambridge)
https://apps.carleton.edu/curricular/cs/alumniprofiles/ (CS grads at Google, Pinterest, IBM, Lockheed Martin, Cray, Amazon, Thomson Reuters)
http://www.wesleyan.edu/mathcs/cs/jobs_etc.html (CS grads at Google, Amazon, Facebok, IBM, Groupon, Pandora, JP Morgan, Federal Reserve Bank, Goldman Sachs, Fidelity, Cigna)
http://www.wellesley.edu/cs/beyond/cs-jobs#VWJ40JfwazccTRtU.97 (CS grads at Google, Apple, Microsoft, Lehman Brothers, Morgan Stanley)
LACs do tend to have more limited course offerings than large RUs across many majors, not just CS. That’s “a feature not a bug” if you want to emphasize breadth not depth. Especially if your college has heavy distribution/core requirements and prerequisites, you won’t be left with too much room to specialize anyway. But if you do want to do that and you’re allowed to place out of many elementary/intermediate courses, then yes, you may prefer a big research university.