Mechanist - Condition Mecha Roamer - MetaBattle

General

火箭飞靴 and 位移纹章 greatly improve your mobility, and mobility is a key part of your defense. Try to avoid being in melee most of the time, especially when your shield skills aren't available. Rocket Boots is a great filler skill to patch gaps in your sustain.
Use the Mech's F1 爆炸重击 as often as possible. The 虚弱 can cover your damaging conditions on top of adding to your sustain by reducing the strike damage they deal. It also helps the Mech stick to your target.
超频纹章 is mostly for the passive CD reduction and the Mech revival portion of the active. Using it for the damage is very rare but sometimes you might want to consider that to help with cleaving downed targets. Against moving targets however landing it can be quite hard, especially on uneven terrain, and the Mech can get CC'd very easily unless you commit to it with 危机区域.
Any boon you gain is also granted to your Mech.

Damage

Most of the burst damage comes from 超导纹章, but getting enemies to stay in range of it is the hard part. Try stunning them with 静电护盾, CC with 天空马戏团 or use 爆炸重击 as a gapcloser for the Mech. Hugging the Mech could also work, forcing enemies to tank the signet's active damage if they want to reach you, but you should be ready to use some defensive skills in that situation.
As for Pistol skills, both 毒镖连射 and 静电射击 deal solid damage. Static Shot could even help you trade blows with enemies better because of the 目盲.
When you have nothing better to do spam 裂弹射击 or kite enemies until your burst CDs come back up.

Sustain

位移纹章 is one of your best defensive skills in general: it breaks stuns, cleanses conditions, and lets you escape to the highground.
(Mech's F2) is your next best defensive skill, useful against every kind of pressure. Cleanses conditions, applies to protect from strike damage, blocks an attack with , breaks stun and makes you immune to CC chains with the .
- This skill is AoE, you could use it to support allies in need too.
- You need to be in range of your Mech for this skill to affect you!
Shield skills and grant you through various Inventions traits, and cleanses conditions from you whenever you gain Protection. Your healing skill removes an additional condition via .
is great for shaking off enemies as well as cleansing several non-damaging conditions, increasing the likelyhood of removing damaging ones if you follow it up with any other skill that cleanses conditions.
Both shield skills are very versatile defensive CDs.
works best against projectiles but its chain skill is an AoE knockback, so even against melee you could use this skill for the CC alone. Or if you want to pressure someone ranged, Magnetic Shield could let you walk up to them while the knockback is a great followup once you're in melee.
is effective at any range but works best in melee as it even stuns enemies who strike you there. For maximum value use its chain skill right as Static Shield is about to run out - the further prevents them from pressuring you, and has the potential to hit them on its way back too.