Software Engineer C#

Leidos is looking for a talented Software Engineer (C#) to join our Security Enterprise Solutions (SES) division in Tewksbury, MA. Come join our cross-functional engineering team using cutting edge technology to develop truly novel solutions that make travel and trade safer, healthier, and more efficient on a global level. Leidos SES leverages industry leading screening technologies, AI / ML capabilities and advanced biometric tools to provide automated threat detection for weapons, narcotics, explosives, contraband, and undeclared goods, as well as nuclear and radioactive materials.

As a Software Engineer (C#) on our diverse and collaborative team, you will work alongside our expert Scientists and Engineers, contributing to Leidos products with global impact on security detection. This isn’t your run-of-the-mill software development – you’ll be honing your engineering skills with embedded products, real-time programming, and object-oriented design, all with the support of a management team focused on your professional growth and advancement. Working under general supervision in a diverse team, your primary responsibility will be to develop, modify and troubleshoot multi-tiered distributed applications and systems. The duties and responsibilities may change from time to time without notice and include but are not limited to the duties described below.

The Software Engineer will participate in the design, development, testing, troubleshooting, and debugging of software programs for enhancements and new software-intensive systems and products. Applies appropriate principles, standards, processes, procedures, and tools throughout the software development life cycle. Duties include software requirements analysis, analysis of hardware compatibility, development of software products and tools used for design, development and maintenance of infrastructure, and platforms.

Primary Responsibilities :

• Design, build, and maintain efficient, reusable, and reliable C# and C++ code using good OOP / OOAD techniques for our systems.
• Optimize, identify bottlenecks, bugs, and devise solutions to problems including :  Maintain code quality, revision control and organization, Analyze customer issues and identify and implement solutions, Participate and contribute within a defined software development process.
• Occasional travel to customer sites may be required. Travel may be domestic and international.

Basic Qualifications :

Preferred Qualifications :

Check out the links below to learn more about Security Enterprise Solutions (SES)

At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”

If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.

Original Posting : July 22, 2025

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 $85,150.00 - $153,925.00

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.