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.
We are currently seeking candidates local to the Tewksbury, MA area. This position offers a flexible hybrid work schedule, with the opportunity to telework two days per week. Additionally, enjoy a 9/80 work schedule—giving you every other Friday off!
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:
- Bachelor's degree with 4+ years of relevant experience, or master’s degree with 2+ years of relevant experience. Additional years of experience will be considered in lieu of education.
- Must have the ability to obtain a Public Trust clearance (US citizenship required).
- Working knowledge of Python and bash scripting, HTML, PHP, PostgreSQL, C#, C++ and OOP/OOAD
- Experience with Windows UI frameworks such as Windows Forms and WPF
- Understanding of data structures, algorithms, and software design solutions.
- Understanding of memory management, multicore processors, and distributed systems design.
- Develops solutions to complex technical issues and problems that impact multiple area or disciplines.
- Regularly employs ingenuity and creativity to develop new technical solutions and systems to achieve functional objectives.
- Communicates with internal team members across multiple areas and client team members.
- Works to influence project/team leaders regarding solution design, process and/or approaches.
- Requires expert knowledge of and ability to apply advanced technical principles, theories, and concepts.
Preferred Qualifications:
- Experience with BuildBot and automated build pipelines with MS Azure.
- Experience with DICOS.
- Experience with npm.
- Experience with http/https communication.
- Interfacing with hardware and real-time debugging.
- Working knowledge of Cybersecurity.
- Working knowledge of networking solutions.
- Experience with Scrum/Agile development methodologies.
Check out the links below to learn more about Security Enterprise Solutions (SES)
https://careers.leidos.com/pages/security-enterprise-solutions
https://www.leidos.com/markets/aviation/security-detection
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, 2025For 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.
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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What We Do
We Are Leidos
For 50 years we have been tackling some of the biggest problems that face our nation and our world.
OUR MISSION
Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
Your most important work is ahead.
