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actual code is less important than you might think. If you dump 1000 lines in front of a reviewer, they might skim it and miss the most important parts :) Keep code samples as small as you can, to highlight the best bits.
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pseudocode can often be more useful than real code. And this is also a helpful way of getting around NDAs, IP ownership, etc. As long as you're not including any sensitive information.
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a portfolio should tell a story that not only illustrates your experience, but shows how you gained it. Eg:
- here's how I started doing
<thing> - then I learned
<technique> - now it looks like
<improved thing>
- here's how I started doing