Types of Engineering: The Main Disciplines, What Each One Does and What It Pays

The short version: Most engineering work falls under four classic branches: civil, mechanical, electrical, and chemical. Around them sit a dozen or more specialties, such as aerospace, biomedical, industrial, environmental, petroleum, and nuclear engineering. Each one solves a different kind of problem, uses different tools, and pays differently. In May 2025 the median wage for architecture and engineering jobs was $99,520, almost twice the $50,980 median for all jobs, according to the Bureau of Labor Statistics.

Apollo Technical has recruited engineers since 2010, across most of the disciplines on this page. Below is what each type of engineer actually works on, what the job pays, and how to tell which one fits you.

Types of engineering at a glance

Pay figures are national 2025 median wages from the BLS Occupational Outlook Handbook. Half of workers earn more and half earn less. Your pay will depend on your city, industry, and experience.

Some job titles you hear every day, such as structural, controls, process, manufacturing, or robotics engineer, are not separate lines in BLS data. The government counts them inside the larger branches above. We cover where each one fits below. For pay in your own city, use our engineering salary calculator.

Civil engineering

Civil engineers plan, design, and oversee the things a community is built on: roads, bridges, buildings, airports, water and sewer systems, and dams. It is one of the oldest branches and one of the largest. Most civil engineers work for consulting firms, contractors, or government agencies, and many split time between the office and job sites.

Civil has several well known specialties:

• Structural engineering designs the frames of buildings, bridges, and towers so they carry loads safely. See is structural engineering a good career.
• Geotechnical engineering studies soil and rock to design foundations, slopes, and retaining walls.
• Transportation engineering designs highways, interchanges, transit, and traffic systems.
• Water resources engineering handles stormwater, drainage, flood control, and water supply.
• Construction engineering manages how a design actually gets built on site.

Civil engineers who sign and seal public work need a Professional Engineer license, so licensure matters more here than in most branches. Read our guide on how to get a PE license, and is civil engineering a good career for pay and outlook.

Mechanical engineering

Mechanical engineers design, build, and test anything that moves or handles heat: engines, pumps, HVAC systems, machinery, tools, and consumer products. It is the broadest branch, and mechanical engineers work in almost every industry, from automotive and aerospace to data centers and food plants.

• HVAC and MEP engineering designs heating, cooling, ventilation, and plumbing for buildings, a large share of work at consulting firms.
• Design engineering turns ideas into 3D models and drawings in tools like SolidWorks or Creo.
• Manufacturing engineering works out how to make a product at scale. See is manufacturing engineering a good career.
• Robotics engineering combines mechanical, electrical, and software work. See is robotics engineering a good career.

More detail: is mechanical engineering a good career and mechanical engineer salary by city.

Electrical engineering

Electrical engineers design, develop, and test equipment and systems that run on electricity, from the power grid down to circuit boards. Electronics engineers focus on the small end of that range. The two share a BLS median of $125,040.

• Power engineering covers generation, substations, transmission, and power distribution inside plants and data centers.
• Controls engineering programs PLCs and automation that run production lines. See what a controls engineer does.
• Electronics engineering designs circuits, sensors, and devices.
• Computer hardware engineering designs processors, memory, and computer systems. It had the highest median pay of any engineering type in 2025 at $161,740. See is computer hardware engineering a good career.

More detail: is electrical engineering a good career.

Chemical engineering

Chemical engineers use chemistry, physics, and math to design the processes and equipment that turn raw materials into products: fuels, plastics, drugs, food, paper, and semiconductors. They work in refineries, chemical plants, pharmaceutical sites, and labs. Many go into process engineering, running and improving a plant unit day to day. See what a process engineer does and is chemical engineering a good career.

Industrial engineering

Industrial engineers design the systems that make production work: plant layouts, workflows, quality systems, and supply chains. Instead of designing the product, they design how people, machines, and materials come together to make it with less waste. Many move into operations or supply chain management. See is industrial engineering a good career.

Aerospace engineering

Aerospace engineers design, develop, and test aircraft, spacecraft, satellites, and missiles. Aeronautical engineers work on things that fly in the atmosphere, astronautical engineers on things that fly in space. Defense work often requires a security clearance. See is aerospace engineering a good career.

Biomedical engineering

Biomedical engineers, also called bioengineers, combine engineering with biology and medicine to build medical devices, implants, imaging systems, and diagnostic equipment. Much of the work happens at medical device makers, where FDA rules shape how products are designed and tested. See is biomedical engineering a good career.

Environmental engineering

Environmental engineers design solutions for water and wastewater treatment, air pollution control, recycling, and cleanup of contaminated sites. They often work for consulting firms and government agencies, and the field overlaps heavily with civil engineering. See is environmental engineering a good career.

Petroleum engineering

Petroleum engineers find ways to get oil and gas out of the ground safely and at a profit. They design wells, plan drilling, and improve production from existing fields. Pay is high, but hiring rises and falls with oil prices. Houston is the center of the field in the US. See is petroleum engineering a good career.

Software and computer engineering

Software engineers design and build applications, systems, and the code inside physical products. Computer engineering sits between electrical engineering and computer science and covers both hardware and the software that runs on it. Embedded software engineers write code for devices, machines, and vehicles, which puts them close to mechanical and electrical teams.

Other types of engineering

• Nuclear engineering covers reactors for power, medicine, and naval propulsion, plus radiation safety and waste.
• Materials engineering develops and tests the metals, ceramics, plastics, and composites that other engineers design with.
• Mining and geological engineering designs mines and ways to extract minerals safely.
• Marine engineering and naval architecture design ships, offshore structures, and the machinery on board.
• Agricultural engineering works on farm equipment, irrigation, and food processing systems.
• Health and safety engineering keeps workers and products safe, often in manufacturing, construction, and oil and gas.
• Fire protection engineering designs sprinkler, alarm, and smoke control systems for buildings.

Which type of engineering pays the most?

On 2025 BLS medians, computer hardware engineers led at $161,740, followed by petroleum ($144,910), aerospace ($134,960), and nuclear engineers ($133,970). Median pay is only part of the picture, though. Location, industry, overtime, and whether you hold a PE license can matter as much as the discipline. Our full ranking is in the highest paid engineering jobs.

Engineers vs engineering technicians

Every branch also has technician and technologist roles. Technicians usually need an associate degree rather than a bachelor’s, and they build, test, measure, and maintain what engineers design. BLS 2025 medians for engineering technician roles ran from about $60,000 for environmental technicians to about $83,000 for aerospace technicians. Drafters, who turn designs into technical drawings, earned a median of $68,090. Many technicians later finish an engineering degree while working.

How to choose a type of engineering

Start with the kind of problem you like, not the salary table. A few questions help:

• Do you want to see what you build? Civil, structural, and construction engineers can drive past their work for decades.
• Do you like machines and hands-on testing? Mechanical, manufacturing, and robotics fit.
• Do you like math, circuits, and code? Electrical, computer, and controls engineering fit.
• Do you like chemistry and big plants? Chemical, process, and petroleum engineering fit.
• Do you like fixing how things run? Industrial engineering and supply chain fit.
• Where do you want to live? Petroleum work clusters in Texas, aerospace near defense hubs, and civil work is everywhere.

The first two years of most engineering degrees share the same math and science, so you can usually switch branches early without losing much time. Mechanical, electrical, and civil also keep the most doors open later.

Job outlook for engineers

BLS projects employment in architecture and engineering occupations to grow much faster than the average for all jobs from 2025 to 2035, with about 174,800 openings each year from growth and from people retiring or changing careers. Data center construction, new factories, power grid upgrades, and defense spending are all driving demand right now. You can see where the projects are on our US data center map and new factory construction map, and where engineers are concentrated on our engineering talent maps.

Frequently asked questions