How to Apply to L3Harris Technologies

10 min read Last updated March 7, 2026 176 open positions
Blake Crosley
Blake Crosley Researched using publicly available information, hiring data, and ATS analysis.

Key Takeaways

  • Put your clearance level and U.S. citizenship at the top of your resume — in defense hiring, this single detail determines whether your application advances or is filtered out immediately
  • Apply through the L3Harris careers portal at careers.l3harris.com and complete every profile field, especially citizenship, clearance, and relocation preferences, which are used as automated screening filters
  • Tailor each application by incorporating exact terminology from the job posting — match their language for tools (DOORS, Simulink), standards (MIL-STD-882E, DO-178C), and role-specific competencies rather than using generic engineering terms
  • Prepare for technical depth in interviews by rehearsing detailed walkthroughs of two to three past projects, including your specific technical contributions, the program phase, challenges encountered, and quantified outcomes
  • Research which L3Harris segment the role belongs to (Integrated Mission Systems, Space and Airborne Systems, Communication Systems, or Aerojet Rocketdyne) and demonstrate familiarity with that segment's mission areas during your interview
  • If you lack an active clearance but are a U.S. citizen with a clean background, apply anyway — L3Harris sponsors clearances for strong candidates, though expect a longer onboarding timeline

About L3Harris Technologies

L3Harris Technologies stands as the sixth-largest defense contractor in the United States, born from the 2019 merger of L3 Technologies and Harris Corporation — two companies with combined legacies stretching back over a century. Headquartered in Melbourne, Florida, L3Harris operates across every domain of modern defense: space, air, land, sea, and cyber. The company designs and delivers mission-critical solutions including advanced electro-optical and infrared sensors, night vision systems, communication networks for military and commercial clients, electronic warfare systems, space payloads, and sophisticated intelligence platforms. With approximately 47,000 employees spread across facilities in Florida, New York, Utah, Texas, Colorado, and dozens of other locations worldwide, L3Harris offers the scale and project diversity of a Tier 1 defense prime while frequently being praised for maintaining a more agile, engineering-driven culture than its larger competitors like Lockheed Martin or Raytheon. Employees commonly describe the environment as technically rigorous but collaborative, with meaningful exposure to cutting-edge programs — many of which are classified. The company's four operating segments (Integrated Mission Systems, Space and Airborne Systems, Communication Systems, and Aerojet Rocketdyne, acquired in 2023) create a broad spectrum of career paths ranging from propellant chemistry and propulsion engineering to cyber intelligence and program finance. L3Harris invests heavily in employee development through tuition reimbursement, leadership programs, and internal mobility across segments. For engineers, scientists, and cleared professionals seeking to work on programs that directly impact national security — from next-generation satellites to advanced missile defense — L3Harris represents one of the most compelling employers in the defense industrial base.

Application Process

  1. 1
    Search and Identify Roles on the L3Harris Careers Portal

    Navigate to careers.l3harris.com and use the robust filtering system to narrow results by keyword, location, clearance requirement, and business segment. With over 750 active postings spanning propulsion, GNC engineering, cyber intelligence, systems engineering, and program finance, precise filtering is essential. Pay close attention to the requisition ID and specific segment (e.g., Space and Airborne Systems vs. Aerojet Rocketdyne), as roles with similar titles may have vastly different program assignments and clearance requirements.

  2. 2
    Create Your L3Harris Candidate Profile

    Register an account on the L3Harris applicant portal, which will serve as your hub for all applications and status tracking. Complete every field thoroughly — including citizenship status, clearance level, and willingness to relocate — as defense contractors use these fields for immediate screening before a human ever reviews your resume. Incomplete profiles, particularly missing citizenship or clearance information, are a common reason applications stall in aerospace and defense hiring pipelines.

  3. 3
    Tailor Your Resume and Upload Supporting Documents

    Upload a resume specifically calibrated to the job requisition, mirroring the technical language and required qualifications listed in the posting. L3Harris postings typically separate 'Required Qualifications' from 'Preferred Qualifications' — your resume must unambiguously address every required item to pass initial screening. If the role mentions specific tools (e.g., MATLAB/Simulink, DOORS, Windchill), certifications (e.g., CISSP, PMP, CompTIA Security+), or frameworks (e.g., DO-178C, MIL-STD-882E), include these exact terms.

  4. 4
    Complete Supplemental Questions and Self-Identification Forms

    L3Harris, as a federal contractor, includes EEO self-identification questions and often adds role-specific screening questions about years of experience, specific technical competencies, and security clearance eligibility. Answer these with precision — stating you have 'some experience' with a required tool when the role demands deep expertise will flag your application negatively. These supplemental responses frequently serve as the first-pass filter before recruiter review.

  5. 5
    Recruiter Screening and Security Clearance Verification

    If your application advances, expect an initial phone screen with a talent acquisition specialist, typically lasting 20-30 minutes. This call will focus heavily on verifying your clearance status (active, interim, or eligibility), confirming your willingness to work on-site (many L3Harris programs require physical presence in secured facilities), and validating your technical qualifications at a high level. Be prepared to discuss your citizenship, any existing polygraph, and your timeline for starting — cleared candidates are often fast-tracked.

  6. 6
    Technical and Panel Interviews

    L3Harris typically conducts one to three rounds of technical interviews depending on the role's seniority and classification level. For engineering positions, expect in-depth discussions about your domain expertise — whether that's propulsion thermodynamics, GNC algorithm development, RF systems design, or cybersecurity architecture. Panel interviews with hiring managers and senior engineers are standard, and many candidates report being asked to walk through past project contributions in significant technical detail rather than answering abstract brainteasers.

  7. 7
    Offer, Background Investigation, and Onboarding

    Upon successful interviews, L3Harris extends a formal offer that typically includes base salary, potential relocation assistance, and benefits enrollment information. For roles requiring a security clearance you don't yet hold, the company may sponsor your investigation — but be aware this process can take months to over a year for Top Secret/SCI with polygraph. Onboarding includes mandatory security training, program-specific briefings, and integration into your business segment's team structure.

Resume Tips for L3Harris Technologies

critical

Lead with Security Clearance and Citizenship Status

In defense hiring, your clearance level is arguably the most important line on your resume. Place your active clearance (Secret, Top Secret, TS/SCI, with or without polygraph) and U.S. citizenship status in your resume header or summary, immediately visible. L3Harris posts hundreds of roles requiring active clearances, and recruiters scanning dozens of resumes daily will prioritize candidates whose eligibility is immediately apparent. If you're clearance-eligible but not yet cleared, state 'U.S. Citizen — Clearance Eligible' explicitly.

critical

Mirror L3Harris Job Posting Language Exactly

L3Harris job descriptions use precise aerospace and defense terminology — terms like 'Model-Based Systems Engineering (MBSE),' 'DO-178C,' 'MIL-STD-1553,' 'SysML,' or 'ITAR-controlled.' Your resume should incorporate these exact terms, not synonyms or abbreviations the ATS might not recognize. For example, if a posting references 'Guidance, Navigation, and Control (GNC),' use that full phrase with the acronym, not just 'flight controls' or 'navigation systems.' This specificity signals domain fluency to both automated screening and human reviewers.

critical

Quantify Impact Within Program or Contract Context

Defense employers value results framed within the context of program milestones, contract deliverables, and mission outcomes. Instead of 'improved system performance,' write 'Reduced GNC algorithm convergence time by 34%, enabling CDR milestone completion two weeks ahead of schedule on a $120M DoD contract.' L3Harris hiring managers, many of whom are engineers themselves, respond to specificity about TRL levels, test success rates, weight/power/cost reductions, and program phases (SRR, PDR, CDR, TRR). Frame your accomplishments in language that resonates with the defense acquisition lifecycle.

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Highlight Cross-Domain and Multi-Segment Relevance

L3Harris operates across space, airborne, maritime, terrestrial, and cyber domains. If your experience spans multiple domains — for instance, you've worked on both satellite communications and ground-based C2 systems — make this breadth visible. The company values engineers and program managers who can operate across its four segments and contribute to integrated solutions. A resume that demonstrates adaptability across platforms and environments aligns well with L3Harris's 'Trusted Disruptor' identity.

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Include Relevant Certifications and Specialized Training

Create a dedicated 'Certifications & Clearances' section that lists credentials particularly valued in the L3Harris ecosystem: PMP for program roles, CISSP/CompTIA Security+ for cyber and ISSO positions, Six Sigma for manufacturing and quality, INCOSE CSEP for systems engineering, and any DoD-specific training (e.g., DAU coursework, COR certification). For Aerojet Rocketdyne division roles in propulsion and propellant chemistry, include any energetic materials handling certifications or OSHA-relevant safety credentials. These certifications often appear as preferred qualifications and can differentiate otherwise similar candidates.

recommended

Use a Clean, ATS-Compatible Format Without Graphics or Tables

Defense contractor ATS platforms are typically configured for high-volume processing of technical resumes. Use a single-column layout with standard section headers (Professional Experience, Education, Technical Skills, Certifications). Avoid tables, text boxes, headers/footers with critical information, or multi-column designs that can scramble during parsing. Save as a .docx or .pdf (check the portal's accepted formats), and ensure all text is selectable — not embedded in images. For L3Harris's technical roles, a two-page resume is standard and expected for mid-career and senior professionals.

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Showcase Relevant Tools, Software, and Technical Environments

L3Harris engineering roles frequently require proficiency in specific toolsets. Create a 'Technical Proficiencies' section organized by category: modeling and simulation (MATLAB, Simulink, STK, ANSYS), systems engineering (DOORS, Cameo, Windchill), programming (C/C++, Python, VHDL), lab equipment and test environments, and classified or proprietary systems (reference generically if restricted). For propulsion and chemical engineering roles at the Aerojet Rocketdyne division, mention experience with propellant formulation tools, energetic materials testing, and relevant safety analysis software. Specificity here directly maps to the screening criteria recruiters use.

ATS System: Workday (Likely)

L3Harris Technologies commonly uses an enterprise-grade applicant tracking system consistent with Workday's recruiting module, which is widely adopted among large defense contractors. This platform parses uploaded resumes into structured data fields, scores applications against requisition requirements, and manages candidate workflows through recruiter dashboards. Accurate formatting and keyword alignment are critical because the system's parsing engine extracts and categorizes your experience before a recruiter ever opens your file.

  • Use standard section headers like 'Professional Experience,' 'Education,' 'Skills,' and 'Certifications' — non-standard headers like 'Where I've Made an Impact' may not parse correctly
  • Include both full terms and acronyms for defense-specific terminology (e.g., 'Model-Based Systems Engineering (MBSE)') to capture keyword matches regardless of how the requisition was coded
  • Avoid placing your name, contact info, or clearance status exclusively in headers or footers, as many ATS platforms skip these regions during text extraction
  • Submit in .docx format when the portal accepts it, as .docx typically parses more reliably than .pdf in enterprise ATS environments; if only .pdf is accepted, ensure the text layer is intact and selectable
  • List each position with a clear employer name, job title, location, and date range (month/year format) — Workday-style systems use these structured fields for experience calculation and duplicate detection
  • Do not use special characters, icons, or rating scales (e.g., skill bars) to represent proficiency levels — these are invisible to text parsers and waste valuable resume space

Complete Workday (Likely) Resume Guide →

Interview Culture

L3Harris Technologies interviews reflect the company's identity as a technically rigorous, mission-focused defense prime with a culture that blends engineering depth with operational pragmatism.

The typical interview process spans two to four weeks and involves two to three rounds, though timelines can extend significantly for roles requiring new clearance sponsorship or those tied to classified programs. The first round is generally a phone or video screen with a recruiter from the talent acquisition team. This conversation focuses on verifying your clearance status, confirming salary expectations and location flexibility, and assessing basic alignment with the role's requirements. For positions requiring on-site presence at secure facilities — which includes the majority of L3Harris engineering roles — expect direct questions about your willingness to work in a SCIF or at a specific geographic location. Subsequent rounds are technical and behavioral, often conducted as panel interviews with the hiring manager, one or two senior engineers or subject matter experts, and sometimes a program manager. L3Harris interviewers tend to favor deep-dive technical conversations over generic behavioral frameworks. For a GNC engineer role, you might be asked to walk through your approach to designing a Kalman filter for a specific sensor fusion problem. For a propellant chemist, expect questions about formulation trade studies and energetic materials safety protocols. Systems engineering candidates commonly report being asked to diagram architectures or discuss requirements decomposition in real time. Behavioral questions at L3Harris typically align with the company's published values — accountability, integrity, innovation, and respect. Interviewers may ask about times you navigated technical disagreements, managed risk on a program, or contributed to a team's success under tight deadlines. The culture tends to value straightforward, evidence-based communication over polished corporate narratives. For manager-level and above roles, expect an additional round with senior leadership, often including discussions about your approach to talent development, cost account management, and cross-functional collaboration. Many candidates report that L3Harris interviewers are respectful of your time, well-prepared, and genuinely interested in understanding your technical depth rather than testing you with trick questions. Coming prepared with specific program examples, quantified results, and a clear understanding of L3Harris's business segments will position you well.

What L3Harris Technologies Looks For

  • Active U.S. security clearance or demonstrated eligibility — this is a non-negotiable prerequisite for the vast majority of L3Harris roles, and candidates with active TS/SCI clearances are particularly sought after
  • Deep domain expertise in aerospace and defense disciplines such as GNC, RF engineering, propulsion, electronic warfare, ISR systems, cybersecurity, or systems engineering — L3Harris hires specialists, not generalists, for most technical positions
  • Familiarity with DoD acquisition lifecycle phases (Milestones A/B/C, SRR, PDR, CDR, TRR) and the ability to deliver within that structured framework
  • Experience with defense-standard tools and methodologies including DOORS, MBSE, MIL-STD compliance, DO-178C, and relevant modeling/simulation platforms
  • Collaborative mindset with a bias toward action — L3Harris's 'Trusted Disruptor' ethos values employees who challenge the status quo while delivering reliably on program commitments
  • Strong written and verbal communication skills, particularly the ability to present complex technical concepts to diverse stakeholders including government customers, program leadership, and cross-functional teams
  • Demonstrated commitment to safety culture, especially critical for Aerojet Rocketdyne division roles involving energetic materials, propellant handling, and hazardous test operations

Frequently Asked Questions

How long does the L3Harris application-to-offer process typically take?
The L3Harris hiring timeline commonly ranges from three to eight weeks for candidates with active security clearances and straightforward backgrounds. However, if the role requires clearance sponsorship, the process can extend to several months or longer while your background investigation is processed. After submitting your application, most candidates report hearing back within one to three weeks if selected for a recruiter screen. Technical interviews are typically scheduled within two weeks of the initial screen. Factors that accelerate the process include holding an active TS/SCI clearance, being a direct match on all required qualifications, and applying to positions with urgent program needs.
Does L3Harris require a cover letter with applications?
The L3Harris application portal typically makes cover letters optional rather than mandatory. That said, a concise, targeted cover letter can be advantageous for competitive roles or when your resume doesn't immediately communicate your fit — for example, if you're transitioning from a different defense prime or from active military service. If you include one, keep it to one page and focus on three things: why you're drawn to L3Harris's specific mission area (not just 'defense'), how your clearance and technical background align with the role, and what unique value you bring. Avoid generic cover letters; reference the specific business segment and program domain.
What security clearance do I need to work at L3Harris?
Clearance requirements vary significantly by role, but the majority of L3Harris engineering and technical positions require at minimum a Secret clearance, with many requiring Top Secret or TS/SCI with polygraph. Some corporate, manufacturing, and unclassified R&D positions may not require a clearance but will still require U.S. citizenship or permanent residency due to ITAR and EAR export control regulations. If you don't currently hold a clearance, you can still apply — L3Harris regularly sponsors clearance investigations for selected candidates. However, you must be a U.S. citizen to be eligible for most clearances, and the investigation timeline (3-12+ months depending on level) should factor into your planning.
Can I apply to multiple L3Harris positions simultaneously?
Yes, and for a company with over 750 active postings across four business segments, applying to multiple well-matched roles is a reasonable strategy. However, quality always outperforms quantity in defense hiring. Tailor each application's resume to the specific requisition rather than submitting identical materials to dozens of postings. Recruiters within the same segment may see your multiple applications, and submitting a generic resume to roles spanning GNC engineering and program finance signals a lack of focus. A targeted approach — applying to three to five closely aligned roles — is typically more effective than a broad scatter.
What is the interview format at L3Harris?
L3Harris interviews typically follow a structured multi-round format. The first round is a 20-30 minute phone or video screen with a recruiter focusing on clearance verification, role fit, and logistics. Subsequent rounds are technical panel interviews — usually one or two sessions lasting 45-60 minutes each — conducted by the hiring manager and senior technical staff. These panels emphasize deep-dive discussions about your past work rather than abstract puzzles or whiteboard coding challenges. For senior and manager-level roles, an additional leadership interview is common. Many interviews are conducted via Microsoft Teams, though on-site interviews are increasingly common, particularly when the role is tied to a classified program that can't be discussed remotely.
Does L3Harris offer remote work opportunities?
Remote work availability at L3Harris is significantly more limited than in commercial tech companies due to the classified nature of most programs. The majority of engineering, intelligence, and systems roles require daily on-site presence at secure facilities where classified work is performed — you cannot access SIPR networks or SCIFs from home. That said, some corporate functions (HR, IT, finance, communications), unclassified engineering support roles, and field service positions offer hybrid or partially remote arrangements. Each job posting on the L3Harris portal specifies the work location and on-site requirements. If location flexibility is important to you, filter for roles explicitly listed as hybrid or remote, but expect these to be a small fraction of total openings.
What experience level do I need to get hired at L3Harris?
L3Harris hires across the full experience spectrum, from new graduates through senior executives. Entry-level roles and internships/co-ops are available and typically posted with titles like 'Associate Engineer' or 'Engineer 1,' requiring a relevant bachelor's degree and sometimes a GPA minimum. However, looking at the active postings, the majority skew toward mid-career and senior professionals — titles like 'Senior Specialist,' 'Senior Engineer,' and 'Manager' dominate. For these roles, five to fifteen years of relevant defense industry experience is common. The Aerojet Rocketdyne division's propellant chemist and propulsion engineer roles often require highly specialized backgrounds. If you're early-career, focus on L3Harris's internship pipeline and entry-level engineering programs, which are often posted in fall for summer start dates.
How should I optimize my resume for the L3Harris applicant tracking system?
Focus on three ATS optimization strategies specific to L3Harris. First, use a clean single-column format with standard section headers and avoid graphics, tables, or skill-rating bars that parsing engines cannot read. Second, embed the exact technical terms from the job posting — if the requisition says 'Model-Based Systems Engineering (MBSE)' or 'MIL-STD-1553,' those exact phrases should appear in your resume. Third, ensure your clearance level, citizenship, and years of experience are clearly stated as standalone data points, not buried within paragraph text, since these are commonly used as knockout screening criteria in defense ATS configurations. Submit in .docx format when the portal permits it for the most reliable parsing.
How important is military or prior defense contractor experience for L3Harris roles?
While not strictly required for every role, military service or prior defense contractor experience is highly valued and gives candidates a significant advantage at L3Harris. Veterans bring existing clearances, familiarity with DoD processes, and understanding of the operational environments L3Harris's products serve. Former military members also tend to have experience with the specific systems L3Harris manufactures (radios, night vision, ISR platforms), which translates directly. L3Harris actively recruits veterans and participates in military transition programs. If you're coming from commercial industry, you can still be competitive — especially in software, cybersecurity, manufacturing, and corporate functions — but be prepared to demonstrate your understanding of the defense acquisition environment, export control regulations, and the security-conscious culture that defines daily work at a company like L3Harris.

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Sources

  1. L3Harris Technologies Careers Portal — L3Harris Technologies
  2. L3Harris Technologies - About Us — L3Harris Technologies
  3. L3Harris Technologies Company Reviews and Interview Insights — Glassdoor
  4. L3Harris Technologies - Defense News Top 100 — Defense News