Creating new toon for POF
Engineer and Holosmith. Looks to work with rifle, but the Sword has some really good gap closing and dishes out really high damage. You can run Grenade kit as utility for range, and switch into Photonforge for massive damage spikes up close. Traited with explosives, the damage bunker potential is practically unbalanced; dropping a line mines as you dodge, and some synergy with photon forge skills.
Second option would be Mirage. It has more ramp up then other classes, but it can maintain it indefinitely (and from target to target) if you manage your skills right.
You say you hate rotations….. frankly no build worth its salt will operate without knowing how synergies work, and taking advantage of it. If you just want a straight, reactive bruiser…. DH Medi Guard. But still, your damage multipliers rely on knowing what order to lay down skills.
Warrior/Spellbreaker might work for you. Warrior has relative simple mechanics, has a high inate survivability, and the Spellbreaker gets a counterattack ability that would seem to gel with you wanting to stand your ground. Warrior has a decent range option in longbow, and an ok one in rifle.