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Scientist, Mechanical Engineer (Thermal Analyst) - Secret Clearance

Plano, Texas

Job ID 11138
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L3Harris is dedicated to recruiting and developing diverse, high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris Technologies is an agile global aerospace and defense technology innovator, delivering end-to-end solutions that meet customers’ mission-critical needs. The company provides advanced defense and commercial technologies across space, air, land, sea and cyber domains. L3Harris has approximately $18 billion in annual revenue and 50,000 employees, with customers in more than 100 countries.

Job Title: Scientist, Mechanical Engineer (Thermal Analyst) - Secret Clearance
Job Code: 11138
Job Location: Plano, TX (On-Site)
Job Schedule: 9/80: Employees work 9 out of every 14 days – totaling 80 hours worked – and have every other Friday off.

Relocation: Relocation assistance can be provided for qualified candidates

Job Description:

This Scientist, Thermal Analyst role will work over a broad range of thermal issues for thermal management of high-power electronics from chip-level simulation to airframe aero-heating analysis. This role is responsible for support of all programs at the L3Harris Plano facility and occasionally assist other facilities.

The Agile Development Group (ADG) specializes in developing disruptive, next-generation technologies for advanced Unmanned Air Systems (UAS / UAV), advanced radar systems, next-generation weapon systems, and other RF sensor technologies using small company agility and big company experience.

Essential Functions:

  • Thermal modeling of electronic systems and thermal management solutions using FEA, CFD, and analyzes based on first principles.
  • In cooperation with design engineers, specify thermal management solutions for high power, high heat flux electronic assemblies.
  • Design / specify heat exchangers.
  • Design / specify liquid cooled cold walls and thermal planes.
  • Design/ specify phase change active cooling solutions.
  • Design thermal test set-ups and execute or oversee testing programs.
  • Derive thermal conditions for vehicles during a range of flight conditions including the effects of MACH number, angle of attack and altitude.
  • Primary point-of-contact with various technical customers, suppliers, and sub-contractors on technical matters of custom thermal management solutions.
  • Support of proposals contributing conceptual thermal designs, costs & performance estimates.
  • Concisely present results of major analysis in peer reviews
  • Demonstrate specification compliance to thermal requirements before customers at formal reviews.
  • Documentation of analysis for historical access.
  • Review analysis of other engineers & mentor in proper analytic techniques.
  • Ability to obtain and maintain any additional clearances as required.
  • Ability to lift to 10 lbs.
  • Up to 10% travel may be required.
  • Other duties as required.


  • Bachelor’s Degree and a minimum of 12 years of prior relevant experience. Graduate Degree and a minimum of 10 years of prior related experience. In lieu of a degree, minimum of 16 years of prior related experience.
  • Active Secret Clearance required.
  • Minimum 8+ years of experience directly developing thermal solutions for electronics.
  • 7+ years experience with heat transfer, thermal management, and cooling of electronics.
  • Minimum 7+ years modeling, specifying, and testing thermal systems and thermal management solutions.
  • Experience in packaging and cooling of high-power electronics.
  • Exeperiece with the thermal management of GaAs, GaN, SiGe, and silicon active components.
  • Experience with thermal testing techniques and instrumentation
  • Low-Cycle solder fatigue analysis.
  • Experience managing suppliers and sub-contractors of thermal management solutions to schedule and technical performance.

Preferred Additional Skills:

  • Excellent people skills to include collaborating in a multi-disciplinary, diverse, and dynamic team environment.
  • Experienced using thermal simulation software for transient and steady state analysis.
  • Proficient with ANSYS or Ice Pak thermal analysis software.
  • Knowledge of thermal ablative materials and analytical predicting of useful life.
  • Clear and concise communication skills; written and verbal.
  • Understanding and background in fluid distribution networks and flow balancing
  • Knowledge of and experience with calculation of aerodynamic heating.
  • Clear and concise communication of technical principles to peers and non-technical audiences
  • Knowledge of and experience with design of RF radome for high heat flux environments.
  • Knowledge of radar systems and high-temperature radome materials.
  • Experience in design for and testing to military environments (i.e., temperature, vibration, shock, etc.)
  • CAD software experience.
  • Knowledge and experience of phase change cooling techniques.
  • Knowledge and experience with submerged liquid cooling and dielectric cooling fluids.

Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information.

By submitting your résumé for this position, you understand and agree that L3Harris Technologies may share your résumé, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions.

L3Harris Technologies is proud to be an Affirmative Action/Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

L3Harris Technologies is an E-Verify Employer. Please click here for the E-Verify Poster in English or Spanish. For information regarding your Right To Work, please click here for English or Spanish.

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