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Salary
$131k – $237k per year
Location
In office (Huntsville)
Seniority
Principal · 12+ years exp
Visa
H-1B filings in 12 months: 50 · green card filings: 24
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 18, 2026. First seen by Alion on Sep 25, 2026. Leidos scores B on the Alion truth index.

Overview
Company
Impact
Profile match
Leidos is an American technology and engineering services company created in 2013 when Science Applications International Corporation split in two, with Leidos taking the technical services and solutions business. It is one of the largest suppliers to the United States government, working across defence programmes, intelligence systems, civil agencies including the Federal Aviation Administration, and healthcare services for the Department of Veterans Affairs. Headquartered in Reston, Virginia, the company also builds security detection products for airports and borders, and has concentrated recent investment on trusted artificial intelligence and autonomy for mission environments.

Looking for an opportunity to make an impact?

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers’ success. We empower our teams, contribute to our communities, and operate sustainable. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

Your greatest work is ahead!

Leidos’ Defense Systems Kinetic Effects Business Area is seeking a Hardware in the Loop Simulation Engineer to join our team in Huntsville, AL to work on expanding programs in the area of flight systems. This includes programs such as US SOCOM’s GBU 69/B Small Glide Munition, AGM-190/A Small Cruise Missile, multiple hypersonic missile development programs, DARPA’s Gremlins program and other rapid development efforts.

Occasional travel will be required for in-person engagements with internal customers and suppliers across multiple Leidos sites as well as flight test activities at government test ranges. This role will report directly to the Flight Vehicle Modeling and Simulation manager in the Small Airborne Effectors Division.

If this sounds like the kind of environment where you can thrive, keep reading!

Leidos Defense Systems Sector provides a diverse portfolio of systems, solutions, and services covering land, sea, air, space, and cyberspace for customers worldwide. Solutions for Defense include enterprise and mission IT, large-scale intelligence systems, command and control, geospatial and data analytics, cybersecurity, logistics, training, and intelligence analysis and operations support. Our team is solving the world’s toughest security challenges for customers with “can’t fail” missions. To explore and learn more, click here!

Are you ready to make an impact? Share your resume with us today!

Primary Responsibilities

  • Manage the hardware-in-the-loop simulation infrastructure for multiple flight system developmental programs, including Small Glide Munition and Small Cruise Missile
  • Detailed understanding of the flight vehicle capabilities and requirements including how to test these in the HWIL environment.
  • Coordinate with program leadership and subsystem lead engineers on integrating and testing new electronic components, flight software and 6-DOF simulation updates.
  • Develop test cases for regression testing and V&V activities, including documentation of planned tests, scheduling test activities, recording and documenting test results, and communicating results to stakeholders, including identifying deficiencies that require attention.
  • Support flight test planning and preparation through HWIL testing of mission plans in nominal and abnormal conditions, and setup to support mission rehearsals.
  • Identify deficiencies in the HWIL architecture and design updates or improvements to address.
  • Participate in the initial standing up of HWIL infrastructure to support new developmental programs through selecting components (such as real-time computers and GPS signal generators), working with vendors to provide pricing and coordinating purchasing of the components.

Basic Qualifications:

  • Bachelors degree in engineering with 12 + years of prior relevant experience or Masters with 10+ years of prior relevant experience.
  • Knowledge and experience with 6-DOF simulations of aerospace vehicles.
  • Experience with hardware-in-the-loop simulation design and testing for aerospace vehicles.
  • Proficiency developing test plans and test reports for HWIL simulations.
  • Candidate must be a resident of the North Alabama area or willing to relocate to the Huntsville - North Alabama, AL area.
  • Ability to obtain a Secret clearance.

Preferred Qualifications:

  • Familiarity and experience with C++ programming.
  • Familiarity and experience with Department of War munitions development and employment.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:

September 25, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

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