Lead, Mechanical Engineer (Thermal)

Job Title: Lead, Mechanical Engineer (Thermal-Space Optics)

Job Code: 46926

Job Location: On-site in Palm Bay, FL or Fort Wayne, IN

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 is available to qualified applicants

Job Description:

L3Harris is seeking an experienced and highly accomplished Lead Thermal Engineer to lead spacecraft-level thermal design, modeling, and analysis activities for advanced space based electro-optical missions. This role is responsible for architecting and validating thermal solutions that ensure mission success across multiple orbital environments. The ideal candidate is a recognized technical expert capable of driving complex spacecraft thermal strategy, mentoring engineers, and collaborating across multidisciplinary teams.

This position can be based in:

• Palm Bay, FL - https://careers.l3harris.com/en/florida
• Fort Wayne, IN - https://careers.l3harris.com/en/Fort-Wayne

Essential Functions:

• Serve as the technical lead for spacecraft-level thermal design, defining architecture, strategies, and requirements for high-reliability space vehicles.
• Develop detailed thermal models and analyses for all mission phases, including worst-case hot/cold environments, eclipse conditions, orbital variations, and mission-specific scenarios.
• Lead creation and validation of thermal control hardware-including radiators, coatings, heat pipes, surface finishes, insulation, heaters, and conductive interfaces.
• Own thermal performance budgets and flow-down of requirements to payloads, avionics, structures, and propulsion subsystems.
• Evaluate thermal impacts of system trades, configuration changes, power profiles, and operational timelines.
• Direct development of thermal math models using industry-standard tools such as Thermal Desktop, SINDA/FLUINT, ESATAN-TMS, or equivalent.
• Provide leadership during spacecraft hardware build, integration, and test-including thermal vacuum (TVAC) planning, execution, anomaly resolution, and correlation of test results to analysis.
• Guide environmental considerations for space platforms including radiation, conduction, convection-free behavior, material properties, surface degradation, and mission life effects.
• Act as a cross-functional leader, collaborating closely with systems engineering, mechanical design, power, RF, digital hardware, manufacturing, and mission assurance teams.
• Mentor junior and mid-level engineers, establishing best practices and driving continuous improvement in thermal engineering processes.
• Prepare high-quality documentation including thermal requirements, analysis reports, review packages, test plans, and verification matrices.
• Ability to obtain a US security clearance

Qualifications:

• Bachelor of Science Degree in Engineering and a minimum of 9 years of prior relevant experience. Graduate Degree in Engineering and a minimum of 7 years of prior related experience. In lieu of a degree, minimum of 13 years of prior related experience.
• 5+ years professional experience using Thermal Desktop
• Prior or current professional experience with thermal design and analysis for space environment/products
• 2+ years of experience as an IPTL or providing technical leadership to an engineering team

Preferred Additional Skills:

• Experience designing for a space environment.
• Hold a current security Clearance or the ability to obtain a security clearance
• Deep understanding of spacecraft materials, thermal coatings, MLI, conductive interfaces, and active thermal control elements.
• Demonstrated success in developing, validating, and correlating thermal models to TVAC results.
• Ability to lead design reviews, guide complex decision-making, and communicate clearly with customers, leadership, and engineering teams.
• Experience working on government, DoD, or national security space missions.
• Knowledge of mission-specific environments such as GEO, LEO, cislunar, or deep space.
• Broad knowledge of thermal-fluids physics including heat conduction and convection of multi-phase flows
• Experience creating and overseeing the development of thermal testing control logic in SINDA/FLUENT
• Familiarity with structural-thermal-optical (STOP) analysis, deployment mechanism thermal behavior, or thermal considerations in RF/high-power payloads.
• Experience with reliability assessments, derating, and long-duration thermal performance modeling.