OK, here's something that I think is a pro-engineering argument.
In cells, DNA is easily and regularly damaged. The reasons include oxidation, radiation, hydrolyis, poisons, etc. I think evidence of engineering is the repair mechanisms that fix damaged and even broken DNA.
Here's some background info on it:
https://en.wikipedia.org/wiki/DNA_repair
I'll focus on a particular repair method I've learned about. Did you know that DNA conducts electricity, and that a repair mechanism uses that feature? Here's how it works: first, two enzymes attach themselves to the DNA. Then one of them fires an electron toward the second one. If the second one receives the electron it means that the strand is unbroken and it detaches. But if it doesn't it walks toward the first one, finds the break, and fixes it.
I think that in itself is amazing. But what's even more amazing is the specifications for those enzymes just happen to be in that very DNA itself. Chance, or engineering?