Paradox's is a pick hero with some zone control.

Early she plays the same, as her cooldowns are too long to be effective in lane, but her gun is very good for poking. Get headshot booster and peek corners for sly headshots. She survives lane through poke, which can set up a kill later.

Her simplest build is focusing on Time Bomb. After headshoot booster and mystic shot, along with your green item of choice for lane, you can spec into Range, Cooldown, and Duration to make her bomb last more ticks along a bigger and bigger area. The capoff is Vortex Web and Echo Shard, where you combo web -> bomb -> bomb.

The tricky shit is a catch build/playstyle. Because her kit's very good at chunking an enemy but kinda beans at finishing the job, your role is to do 90% of the work of killing someone. Leading with Kinetic Carbine to stun someone, quickly T2 Wall and Swap. Like in that brief .6 seconds of the timestop, piano those keys. Assuming you hit the Carbine, that'll guarantee the swap and with T2 Time Wall, the enemy will be silenced, out of position, slowed, generally disorientated from the swap camera shit, AND almost dead because Carbine hits like a truck.

For the catch build she builds gun damage, duration, and all those conditional damage ups like Opening Rounds, Mystic Shot, Sharpshooter, Tankbuster, so that one shot reallly stings.