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214 intern engineer jobs at 141 companies in Diamond Bar, CA

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Manufacturing Engineer Intern
Cerritos, California, United States
$25/hr OnsiteInternship
Amphenol CIT
Amphenol CITNYSE: APH: Designs and manufactures high-performance wire, cable, and interconnect solutions.
0+ YOE0-1 years engineering/CI experience; Lean/manufacturing knowledge; EHS awareness; Bachelor's in Engineering; strong communication; MS Office and Minitab skills.
MS Office, Minitab
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2w
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Manufacturing Engineer Intern
Santa Ana, California, United States
$17-$24/hr OnsitePart Time
Masco
MascoNew York Stock Exchange: MAS: Manufactures and distributes home improvement and building products.
Mechanical/Industrial engineering student; Microsoft Office proficiency; CREO a plus; good communication; intermediate math; able to lift up to 20 lbs; legally authorized to work in the U.S.
Microsoft Outlook, Microsoft Word, Microsoft Excel, CREO
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1mo
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2027 Mechanical Engineer Intern
Atlanta or Boston or Costa Mesa or Irvine or Seattle or Huntsville
$30-$45/hr OnsiteInternship
Anduril Industries
Anduril Industries: Defense technology building autonomous military hardware and software.
Pursuing a bachelor's in mechanical engineering or related field, rising senior status, collegiate project/lab experience, CAD and hands-on fabrication skills, strong engineering fundamentals, U.S. Person required.
CAD, NX, Teamcenter, SolidWorks, FEA, CFD
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3w
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Manufacturing Engineer Intern
Santa Fe Springs, California, United States
$20/hr OnsitePart Time
RD Rubber Technology Corporation
RD Rubber Technology Corporation: Manufacturer of custom precision molded rubber components.
Internship requiring familiarity with engineering calculations, CAD modeling, prototyping, manufacturing processes, and the ability to prepare reports and support continuous improvement projects; hands-on manufacturing experience preferred.
CAD
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2w
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Roadway/Highway Intern
Irvine, California, United States
$23-$40/hr OnsitePart Time
Parsons
ParsonsNYSE: PSN: Provides engineering and technology services for infrastructure and defense.
Enrolled in an accredited engineering curriculum (typically 1+ year completed). Responsibilities include roadway design, construction documents, quantity takeoffs, and field surveys.
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Intern - Engineering
Irvine, California, United States
$19-$22/hr OnsiteInternship, Part Time
Transportation Corridor Agencies
Transportation Corridor Agencies: Operates and maintains public toll roads in Orange County.
0+ YOEJunior/senior undergrad or graduate student in civil/transportation/environmental engineering; GPA 2.5+; strong MS Office; basic reading of drawings; eager to learn; no prior experience required.
Microsoft Office, AutoCAD, GIS
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1mo
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Firmware Engineer Intern
Irvine, California, United States
OnsiteInternship
Fluxergy
Fluxergy: Portable diagnostic platform for rapid point-of-care laboratory testing
0+ YOEEnrollment in a Bachelor’s or Master’s program; 30-40 hours/week; proficiency in C/C++; RTOS exposure; strong problem-solving and communication skills.
C/C++, RTOS, Git, Embedded systems
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1w
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Engineering Intern
Los Angeles, California, United States
$22-$25/hr OnsiteFull Time
DCX-CHOL Enterprises
DCX-CHOL Enterprises: Designs and manufactures electrical interconnect systems for harsh environments.
0+ YOERecent engineering graduate with BS in engineering; familiarity with GD&T, manufacturing and interpreting drawings; Microsoft Office skills; interest in electromechanical manufacturing.
Geometric Dimensioning and Tolerance (GD&T), Microsoft Word, Microsoft Excel, Microsoft Visio, Microsoft PowerPoint, Adobe Acrobat PDF, MRP
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2mo
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Project Engineer Intern - Summer 2027
Sacramento or Oakland or Commerce or San Diego or Goodyear or Manassas
$21-$28/hr OnsiteFull Time
Helix Electric
Helix Electric: Provides electrical contracting and design-build services for complex projects.
Enrolled in a bachelor’s degree program; construction or engineering focus; internship or related experience preferred; strong communication, math, and organizational skills.
BIM, Accubid, Excel, AutoCAD, Microsoft Office
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ME Intern
Irvine, California, United States
$18-$28/hr OnsiteInternship, Part Time
One-Cycle Control
One-Cycle Control: Manufacturer of high-performance power electronics and conversion technology.
US citizen or Green Card required; ability to read work orders, follow instructions, good communication, attention to detail; minimum 16 hours/week; background check and drug test possible.
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1mo
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Intern, Industrial Engineer (Business Excellence)
Aliso Viejo, California, United States
$21-$34/hr OnsiteInternship
MicroVention
MicroVention: Manufacturer of neurovascular medical devices for stroke treatment.
Pursuing a Bachelor’s or Master’s in Business, Engineering, Analytics or related; strong analytical and communication skills; MS Office with Excel emphasis; ability to work cross-functional; eligible to work in the U.S. without visa sponsorship.
Microsoft Office, Microsoft Excel, Power BI
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2w
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Engineering Intern
Brea, California, United States
$25-$28/hr OnsitePart Time
Howmet Aerospace
Howmet AerospaceNYSE: HWM: Manufactures high-performance metal components for aerospace and transportation.
Must be enrolled (Sophomore–Senior) in manufacturing/mechanical/industrial engineering or similar; basic manufacturing principles, teamwork, analytical and problem‑solving skills; ability to access export‑controlled data.
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Highway Intern
Riverside, California, United States
OnsiteInternship, Part Time
HDR
HDR: Global provider of engineering, architecture, environmental and construction services.
Currently enrolled in an undergraduate or graduate engineering program; attention to detail, problem-solving and communication skills; basic Microsoft Office skills; ~20 hours/week on-site; mentoring by licensed engineer.
Microsoft Office
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Highway Intern
Riverside, California, United States
$22-$26/hr OnsitePart Time, Temporary
HDR
HDR: Global firm providing architecture, engineering, and environmental services.
0+ YOECurrently enrolled in an undergraduate or graduate Engineering program; detail-oriented; strong problem-solving and communication skills; basic MS Office; on-site work ~20 hours/week; no remote.
Microsoft Office
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1w
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Fall Engineering Intern
Los Angeles, California, United States
OnsiteFull Time
Odin Dynamics
Odin Dynamics: Developing autonomous underwater vehicles for defense and maritime missions.
Currently pursuing B.S. or M.S. in an engineering or related field, U.S. citizenship required, foundational skills in CAD/CAE, embedded programming or circuit design, and hands-on prototyping experience.
CAD/CAE, embedded systems, E-Verify
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Intern to Entry Level Conversion - Engineering (Summer 2026 Intern Program)
Seattle or Saint Charles or Huntsville or Portland or Midwest City or Oklahoma City or Berkeley or Miami or Huntington Beach or Hazelwood or Germantown or El Segundo or Fort Walton Beach or Ridgecrest or Tukwila or North Charleston or Kennedy Space Center or Heath or Houston or Fairfax or Colorado Springs or Seal Beach or Long Beach or Newburgh or Renton or Saint Louis or Auburn or Philadelphia or Everett or San Antonio or Kent or Mesa or New Orleans
$50k-$174k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, satellites, and defense systems.
Currently enrolled engineering/applied-sciences student with expected graduation before September 2027; previously interned with Boeing; strong academics, collaboration, and technical project experience; ability to meet export-control U.S. Person requirements for many roles.
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1mo
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Intern/Co-op - Refining Chemical Engineering Fall 2026
Findlay or El Paso or Anacortes or Wilmington or Martinez or Owensboro or Canton or Canonsburg or Mandan or Salt Lake City or Dickinson or Robinson or Detroit or St Paul Park or Catlettsburg or Garyville or Texas City or Kenai or San Antonio
$33-$42/hr OnsitePart Time, Internship
Marathon Petroleum
Marathon PetroleumNYSE: MPC: Refines and markets petroleum products and renewable fuels.
Must be majoring in Chemical Engineering, strong academic performance, concurrently enrolled in a degree program, valid driver's license, authorized to work in the US indefinitely, availability for multiple co-op/term assignments preferred.
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2mo
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2026-2027 Facilities Engineering Intern (Previous Intern)
Houston or Ames or Bakersfield or Belle Chasse or Covington or El Segundo or Geismar or Greeley or Midland or Pasadena or Pascagoula or Richmond or Salt Lake City
$28-$8k/mo OnsiteFull Time
Chevron
ChevronNYSE: CVX: Global energy producing oil, gas, and petrochemicals.
Bachelor's or Master’s in Chemical Engineering; strong academics; leadership, teamwork, problem-solving; relocation possible.
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Turbomachinery Intern Fall 2026
Long Beach, California, United States
$28/hr OnsiteInternship
Rocket Lab
Rocket LabNasdaq: RKLB: Operates launch vehicles and manufactures satellites for space missions.
0+ YOEEnrolled in engineering/physics/math; at least one semester remaining; GPA 3.0+; 3+ months engineering experience.
Solidworks, Catia, NX, ANSYS, Matlab, Python
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5d
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Engineering Intern
Burbank, California, United States
$25/hr OnsiteInternship
Senior
SeniorLondon Stock Exchange: SNR: Designs and manufactures high-technology components for aerospace and land vehicles.
Working toward or recently graduated with BS/MS/PhD in Mechanical/Aerospace/Physics; proficient in MS Office, MATLAB or programming (VBA/Python); strong problem-solving and communication; able to work 24-40 hrs/week onsite.
Microsoft Word, Microsoft Excel, Microsoft PowerPoint, MATLAB, VBA, Python
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