I'm not talking about bugs or general programming questions, but more like feedback on the style, features, performance, etc of what I write.
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For feedback on already working code, you ought to consider Code Review.SE: that's their specialty.
Check their FAQ look around at their questions to see if there's a match for the type of question you want to ask. If you're still in doubt, try asking about your question on their meta-discussion site.
For higher-level, conceptual questions about programming design, your question might work well on Programmers.SE. If you are interested in high-level feedback, please make sure your question is specific enough to be answerable (e.g., no "Should I use two spaces or three spaces when indenting my code?" or "What should I name my variable?" questions).