I noticed [specific, genuine observation about the company — a product launch, funding round, article they were quoted in, problem they're publicly working on]. That caught my attention because I have spent the last [X years] doing exactly that kind of work — most recently at [Employer] where I [one-line achievement with metric].

I realise you may not have an open role that maps to my background right now. That's fine — I'm not sending a generic application. I'm reaching out because I believe I could contribute to [specific area of the company — team, product, challenge], and I'd rather have that conversation early than wait for a job posting.

Here is what I bring to the table:
✓ [Specific skill or experience relevant to their work, with context]
✓ [Second relevant strength or achievement]
✓ [Third point — could be a tool, industry knowledge, or type of problem you solve]

If there's potential alignment, I'd genuinely enjoy a 20-minute call to explore it. No pressure either way — I just thought it was worth reaching out.