Software Engineer, AI Engineer

Job Description Description

Unleash your curiosity. Solve what others can’t.
At Leidos , we’re not just writing code-we’re decoding the unknown. Our San Diego research and engineering team tackles some of the most complex challenges in national defense using advanced signal processing, ocean remote sensing, and high-performance computing .

We’re looking for a Software Engineer / Computer Scientist who thrives on solving hard problems and pushing the boundaries of performance. You’ll join a cross-disciplinary team of scientists and engineers-experts in hydrodynamics, physics, acoustics, and signal processing -to build high-impact software that extracts meaning from massive, complex data sets.

If you’re driven by innovation, energized by collaboration, and ready to see your algorithms power real-world missions-you belong here.

• Collaborate with scientists and engineers to design, implement, and optimize advanced algorithms that power next-generation radar, optical, and infrared sensor systems.
• Engineer high-performance backend systems for scientific computing and distributed environments.
• Integrate, refactor, and optimize scientific codebases, ensuring scalability and efficiency.
• Translate and enhance existing code for GPU/CUDA acceleration and parallel/distributed execution.
• Test, document, and evolve complex software in a Linux/Unix environment.
• Work in a collaborative environment that values technical rigor, creativity, and growth
  .

• Bachelor’s degree in Computer Science, Applied Mathematics, Physics, or related field with 6 years of backend software development experience; or Master’s with 4 years
  . Equivalent experience may be considered in lieu of degree.
• U.S. citizenship and ability to obtain a Top Secret clearance (active TS preferred).
• Demonstrated expertise in C/C backend software development
  , including large-scale, performance-critical applications.
• Proven experience with high-performance computing
  , parallel/distributed processing
  , and standards such as MPI
  .
• Hands‑on experience with GPU/CUDA programming and optimization.
• Experience with AI/ML and LLM concepts and algorithms
• Strong foundation in advanced mathematics or physics
  , with the ability to translate theory into functional code.
• Proficiency in Linux/Unix development environments.
• Familiarity with scientific programming
  , algorithm implementation, and system‑level problem‑solving.
• Strong understanding of software engineering principles and best practices.
• Excellent written and verbal communication and software documentation skills.

• Active Top Secret clearance
• Familiarity with Agile development
  , object-oriented design
  , and modern software architecture.
• Experience with Git
  , Git Lab
  , MATLAB
  , and Fortran
  .
• Knowledge of multi-threaded or shared-memory applications
  .

You’ll be part of a team that:

• Combines science, technology, and imagination to solve real-world defense challenges.
• Values your curiosity as much as your technical ability.
• Invests in your professional growth through mentorship and hands‑on innovation.

At Leidos, your code doesn’t just run‑it defends, detects, and delivers .

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.

October 21, 2025

Pay Range $87,100.00 – $

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.

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees,…