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Specialties inside the field
Thermal and fluid systems
Engines, heat exchangers, cooling. The hardest math and often the best pay.
Manufacturing and process
Making the thing repeatably and cheaply. Plant based and hands on.
Mechatronics and robotics
Where mechanical meets electrical and code. Growing fast.
Heating, ventilation and air conditioning design
Building systems work, one of the areas where the Professional Engineer license genuinely matters.
Test and validation
Instrumenting hardware and breaking it on purpose to prove the design.