From my work, men gain light
Yet my work keeps me out of sight
Moving matter to different places
Concealing the most jagged faces
Construction without a hard hat
Where most have curvy, I have flat
7 Answers
Is it
The Wind?
From my work, men gain light
Wind electricity generator
Yet my work keeps me out of sight
You can't really see the wind.
Moving matter to different places
The wind moves clouds and dust around, even sand, etc.
Concealing the most jagged faces
Given time, even most jagged surfaces will get smoothed by the wind
Construction without a hard hat
The wind doesn't really wear a hat
Where most have curvy, I have flat
Not sure on this, seems to me similar to the previous about the jagged surface.
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$\begingroup$ I gather there is an up-vote for the effort but I didn't get it right. $\endgroup$ Aug 16, 2016 at 6:04
Maybe
A microchip?
From my work, men gain light
Something to do with computer monitors?
Yet my work keeps me out of sight
Not on display when working.
Moving matter to different places
Robots!
Concealing the most jagged faces
...
Construction without a hard hat
Roboooots! :D
Where most have curvy, I have flat
Brains! A computer brain is flat while bio-brains are curvy! This is probably my strongest connection and actually... I probably haven't got this one...
Are you
Shadow?
From my work, men gain light
By existing, shadow provides the constrast that we need to notice light - can anything be "light" without darkness?
Yet my work keeps me out of sight
Things in shadow are often hard to see.
Moving matter to different places
Not entirely sure here, maybe to do with dark matter?
Concealing the most jagged faces
When features become difficult to distinguish in shadow
Construction without a hard hat
Not sure... maybe because it's a "shady" practice :P
Where most have curvy, I have flat
Shadows of 3D objects are projected onto a 2D plane (shadows are flat)
Could it be:
Undersea Cable?
From my work, men gain light
Transferring electricity to power the light
Yet my work keeps me out of sight
"Hidden" as in under water/sea
Moving matter to different places
Transferring electricity
Concealing the most jagged faces
Not too sure, but jagged wires hidden from the cover
Construction without a hard hat
Undersea construction does not need a hard hat
Where most have curvy, I have flat
Most cable line are curvy, yet this one is flat
My answer
Beaver
From my work, men gain light
beaver's work inspired the dam, like the Hoover Dam, which gives electricity or light.
Yet my work keeps me out of sight
the beaver's dam is built to hide it and it's family
Moving matter to different places
beavers move trees and plants to make the dam
Concealing the most jagged faces
then the beaver is hidden, along with their toothy faces
Construction without a hard hat
beavers chop trees without a hat
Where most have curvy, I have flat
Beavers have a flat tail where most tails are curvy. This is the refining point of the riddle.
Is it
God?
From my work, men gain light
From Genesis 1 of the Bible: "Then God commanded, “Let there be light”—and light appeared."
Yet my work keeps me out of sight
This God has never been seen, as best we can deduce.
Moving matter to different places
God, being all-powerful, can move land, create continents and oceans, etc. according to the Bible.
Concealing the most jagged faces
Genisis 1 goes that God created oceans, which would have obscured many an underwater rocky mountain.
Construction without a hard hat
Would you picture God doing all this while wearing a hard hat?
Where most have curvy, I have flat
Humans are all 3-dimensional (and thus 'curvy') but God could theoretically be 2-dimensional?
Is it
a coal or a diamond miner?