From Brotato Wiki
Engineering
Increases the power of your structures. The other stats don't affect structures but specials do (piercing, bouncing, explosion etc.). There is no limit to this. If this is negative your structures have x decreased power down to a minimum of 1 damage or healing.
Items
Positive
The following Characters have a higher chance to find these items in the Shop: 
Engineer
| Name | Rarity | Effects | Base Price | Limit | Unlocked By |
|---|---|---|---|---|---|
| Tier 3 | +3 Melee Damage +3 Ranged Damage +3 Elemental Damage +3 Engineering +5 % Crit Chance -6 % Dodge |
80 | |||
| Tier 1 | +1 Engineering | 8 | |||
| Tier 2 | +4 Engineering +1 Knockback -4 % Damage |
35 | |||
| Tier 2 | +5 % Speed +3 Engineering -3 % Crit Chance |
40 | Win a run with  Explorer |
||
| Tier 4 | +10 Engineering +50 % XP Gain -3 Max HP |
90 | |||
| Tier 1 | +1 Armor +1 Engineering -2 Max HP |
20 | |||
| Tier 4 | +3 Armor +5 % Crit Chance +5 Engineering +5 % Speed -2 HP Regeneration -2 % Life Steal |
90 | |||
| Tier 2 | +5% chance to double the value of picked up materials +6 Luck +2 Engineering -5 % Damage |
40 | 20 | ||
| Tier 1 | +2 Engineering -1 % Attack Speed -1 % Crit Chance |
15 | |||
| Tier 4 | +3 Melee Damage at the end of a wave +3 Engineering at the end of a wave -1 Max HP at the end of a wave |
100 | Win a run with Engineer |
||
| Tier 3 | +6 Engineering -8 % Attack Speed |
55 |
Negative
| Name | Rarity | Effects | Base Price | Limit | Unlocked By |
|---|---|---|---|---|---|
| Tier 2 | +6 % Damage +2 % Life Steal -2 Engineering |
60 | Win a run with  Ghost |
||
| Tier 4 | +10 Elemental Damage +20 Luck -5 Engineering |
90 |
Mechanics
These items use your Engineering stat to deal more damage. They either place mines, or are turrets.
The following Characters have a higher chance to find these items in the Shop: Engineer
| Name | Rarity | Effects | Base Price | Limit | Unlocked By |
|---|---|---|---|---|---|
| Tier 1 | A landmine spawns every 12 seconds dealing 10 (+100% ) damage in an area |
15 | |||
| Tier 1 | Spawns a turret that shoots bullets dealing 10 (+80%) damage |
15 | |||
| Tier 2 | Spawns a turret that shoots flames dealing 8x5 (+33%) burning damage |
40 | |||
| Tier 2 | Spawns a medical turret that shoots bullets healing 3 (+5%) HP |
40 | |||
| Tier 3 | Spawns a turret that shoots piercing bullets dealing 20 (+125%) damage |
65 | |||
| Tier 4 | Spawns a turret that shoots explosive bullets dealing 25 (+150%) damage in an area |
80 | |||
| Tier 3 | Spawns a little guy that slowly shoots 10 piercing lightning projectiles around him for 10 (+75%+75% ) damage each |
75 |
