Full-Time

Principal – Mechanical Design Engineer

L3Harris Technologies

L3Harris Technologies

10,001+ employees

Defense technology solutions for national security

No salary listed

No H1B Sponsorship

Orlando, FL, USA

In Person

US Citizenship, US Top Secret Clearance Required

Bachelor's, Master's

Category
Mechanical Engineering
Required Skills
GD&T

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Requirements
  • Bachelor’s Degree and minimum 12 years of prior mechanical design engineering experience. Graduate Degree and a minimum of 10 years of prior mechanical design engineering experience. In lieu of a degree, minimum of 16 years of prior mechanical design engineering experience.
  • Ability to obtain US security clearance.
  • Experience with aerospace flight vehicle design.
  • Research and analyze data such as customer design proposals, specifications, and manuals to determine feasibility of design or application.
  • Research, plan, design, and provide guidance to other engineers for mechanical and electromechanical products and systems.
  • Analyze, design and test products or systems such as instruments, controls, and mechanical, thermal, hydraulic, or heat transfer systems.
  • Ability to serve as a Geometric Dimensioning and Tolerancing Subject Matter Expert for the organization.
  • Proficiency in preparing conceptual models and design review materials. Understanding of mechanical analysis requirements and techniques used for initial sizing and design verification.
  • Plan and possibly direct engineering personnel in fabrication of test control apparatus and equipment, and development of methods and procedures for testing products or systems
  • Detail-oriented and able to perform Peer Reviews of fellow engineers’ designs and drawings.
  • Position may require occasional overtime.
  • 20% travel (10 - 20%) as required to meet critical schedule milestones.
Responsibilities
  • Ability to create and guide the development of aerospace structure designs including structure assemblies, component installations, and bracket designs that conform to requirements documents. Ability to assist in requirements verification of those designs.
  • Ability to communicate, both verbally and in writing, with technical and non-technical professionals at all levels.
  • Experience with aerospace flight vehicle design.
  • Research and analyze data such as customer design proposals, specifications, and manuals to determine feasibility of design or application.
  • Research, plan, design, and provide guidance to other engineers for mechanical and electromechanical products and systems.
  • Analyze, design and test products or systems such as instruments, controls, and mechanical, thermal, hydraulic, or heat transfer systems.
  • Ability to serve as a GD&T SME for the organization.
  • Proficiency in preparing conceptual models and design review materials. Understanding of mechanical analysis requirements and techniques used for initial sizing and design verification.
  • Plan and possibly direct engineering personnel in fabrication of test control apparatus and equipment, and development of methods and procedures for testing products or systems
  • Detail-oriented and able to perform Peer Reviews of fellow engineers’ designs and drawings.
  • Position may require occasional overtime.
  • 20% travel (10 - 20%) as required to meet critical schedule milestones.
  • Ability to obtain US security clearance.
Desired Qualifications
  • 5+ years of experience with basic material selection, sheet metal design practices, basic machining practices and hardware selection.
  • Proficiency with PTC’s Creo 8.0 or later revision, especially with detail part design, large assembly management and drawing documentation.
  • Proficiency and experience with ASME Y14.5-1994 and generating detailed documentation of parts, assemblies and installations.
  • Proficiency in non-conforming material review of root cause / corrective action and disposition instructions.
  • Proficiency with hands-on engineering support of manufacturing.
  • Proficiency in design of mechanical ground support equipment and handling procedures / methods.
  • Experience in preparation of estimates for design tasks.
  • Ability to prepare or lead the preparation of part lists.
  • Knowledge of engineering change document preparation and impact assessments.
L3Harris Technologies

L3Harris Technologies

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L3Harris Technologies provides defense and national-security technology solutions across space, air, land, sea, and cyber domains. It develops integrated systems with advanced communications, surveillance, and reconnaissance to support government agencies and defense contractors under long-term contracts. The product combines hardware, software, and services to deliver secure, interoperable, mission-critical capabilities. Its goal is to help clients strengthen operational readiness and national security through reliable, multi-domain technologies and sustained partnerships.

Company Size

10,001+

Company Stage

IPO

Headquarters

Melbourne, Florida

Founded

1895

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Simplify Jobs

Simplify's Take

What believers are saying

  • July 29, 2026 results showed $42 billion backlog and raised full-year guidance.
  • July 27, 2026 DoW agreements quadruple THAAD and triple PAC-3 propulsion output.
  • The July 13, 2026 satellite award expands immediate production across Indiana and Florida.

What critics are saying

  • Golden Dome and interceptor orders concentrate revenue on one conflict-driven Pentagon priority.
  • Aerojet's new capacity must execute by 2028, or deliveries miss DoW expectations.
  • BAE's April 2026 settlement shows recurring contract-dispute exposure around proprietary defense work.
  • Any PAC-3 or THAAD propulsion slip would damage U.S. deterrence trust and re-compete awards.

What makes L3Harris Technologies unique

  • Aerojet Rocketdyne powers PAC-3 MSE and THAAD propulsion, critical to U.S. missile defense.
  • L3Harris won July 13, 2026 AMDT3 satellites, linking space sensing to Golden Dome.
  • Vampire and Aeromet give L3Harris low-cost counter-drone and airborne test-verification niches.

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Benefits

Health Insurance

Disability Insurance

401(k) Retirement Plan

401(k) Company Match

Paid Vacation

Paid Holidays

Mental Health Support

Relocation Assistance

Growth & Insights and Company News

Headcount

6 month growth

14%

1 year growth

14%

2 year growth

14%
Associated Press
Aug 10th, 2026
L3Harris completes hot-fire test of stage two rocket motor for Next Generation Interceptor program

L3Harris Technologies has successfully completed a hot-fire test of its stage two advanced large solid rocket motor for the Missile Defense Agency's Next Generation Interceptor programme. The company conducted the test as part of the Lockheed Martin team developing the homeland missile defense system. The test validated the system's design integrity, with the motor completing a full-duration burn in a simulated high-altitude, vacuum environment. Engineers evaluated performance in conditions mimicking Earth's upper atmosphere. L3Harris serves as the primary propulsion and control systems provider for NGI, producing both stage one and stage two rocket motors, plus the Attitude Control System and Divert and Attitude Control System. The company manufactures components across facilities in California, Virginia, Alabama, and Arkansas.

Yahoo Finance
Aug 10th, 2026
Iran tensions expose defense supply gaps as AeroVironment lands $186M drone deal

Iran's recent attacks in the Strait of Hormuz and Red Sea have exposed critical shortages in defense supplies, particularly drones, precision weapons, and artillery shells. This situation presents opportunities for defense contractors positioned to scale production. AeroVironment secured a $186 million US Army order in February 2026 for Switchblade loitering munitions, part of a five-year contract with a $990 million ceiling. The systems enable small units to destroy armored vehicles without larger missiles. L3Harris Technologies reported orders of $7.8 billion in Q1 2026, with a book-to-bill ratio of 1.4 and record backlog of $40.7 billion. By Q2, backlog reached $42 billion on $7.3 billion in new orders, with revenue increasing 8% to $5.9 billion. Both companies are positioned to benefit from increased demand driven by ongoing conflicts.

Yahoo Finance
Jul 31st, 2026
US Pentagon signs seven-year deals with L3Harris and Lockheed Martin to expand missile defense production

The US Defense Department announced two seven-year agreements with L3Harris Technologies and Lockheed Martin on 27 July to expand propulsion capacity for Patriot and THAAD interceptors, addressing missile defence system shortages driven by Iran tensions. RTX also benefits as a key contractor and supplier for these systems. L3Harris is up 3% this year, whilst RTX and Lockheed Martin have gained more than 17% and 19% respectively. Lockheed reported Q2 revenue of $20.1 billion, up 11% year over year, with a record backlog of $230 billion. Through its Aerojet Rocketdyne business, L3Harris supplies solid-rocket motors for THAAD and Patriot missiles, benefiting from demand regardless of contract awards.

Yahoo Finance
Jul 30th, 2026
L3Harris to quadruple THAAD missile propulsion production under 7-year DoW contract

L3Harris Technologies has signed a framework agreement with the Department of War and Lockheed Martin to quadruple propulsion production for the Terminal High Altitude Area Defense (THAAD) system. The seven-year contract will be the largest THAAD propulsion award L3Harris has received to date and is expected to be finalised later this year. L3Harris produces THAAD's Solid Rocket Boost Motors and Liquid Divert and Attitude Control Systems for the Missile Defense Agency. The company manufactures these components at facilities in Huntsville, Alabama, Camden, Arkansas, and Los Angeles. The expansion builds on L3Harris' ongoing investments, which include constructing approximately 60 facilities and adding or upgrading nearly one million square feet of manufacturing and office space across its rocket motor production sites in Alabama, Virginia, and Arkansas.

Associated Press
Jul 29th, 2026
L3Harris Technologies reports record $42B backlog, raises 2026 revenue and EPS guidance

L3Harris Technologies reported strong second quarter 2026 results with revenue of $5.9 billion, up 8% year-over-year. The aerospace and defence company posted diluted earnings per share of $3.13, a 28% increase. Orders reached $7.3 billion with a book-to-bill ratio of 1.2x, pushing backlog to a record $42 billion. Operating margin improved 60 basis points to 11.1%, whilst segment operating margin reached 16.0%. Operating cash flow rose 37% to $879 million, and free cash flow increased 37% to $771 million. Capital expenditures totalled $108 million. The company raised its full-year 2026 guidance, now expecting consolidated revenue of $23.2 billion to $23.7 billion and diluted EPS of $11.75 to $11.95. Growth was driven across all segments including Space & Mission Systems, Communications & Spectrum Dominance, and Missile Solutions.