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Junior Systems Engineer

Location: San Diego, California Job ID: 2024-9168 Potential to Telecommute: Hybrid
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A 100% employee-owned and operated technology firm, Modern Technology Solutions, Inc. (MTSI) provides high-demand technical expertise in Digital Engineering & Transformation, Space Systems, Unmanned Systems, Flight Test Engineering, Modeling and Simulation, Cybersecurity, and DevOps for advanced defense and intelligence special programs. MTSI delivers first-choice capabilities to solve problems of global importance. We are proud of our proven track record of outstanding service and customer satisfaction.

We work hard to protect our reputation by providing quality technical and programmatic work and employing ethical, honest, and fair business practices. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

  • Full Time
  • Level: Secret
  • Travel: Minimal (if any)

Success Profile

What makes a successful candidate? See if you have what it takes.

When you join our engineering team, you'll collaborate on some of the most advanced development programs for our Department of Defense (DoD) and intelligence customers. Together as a team, you will typically work on-site with our government customers to go above and beyond to deliver effective solutions. Come and join a 100% employee-owned workplace that encourages you to take control of your career success.

  • Collaborative
  • Communicator
  • Creative
  • Curious
  • Emotional Intelligence
  • Versatile

Our Culture

Since 1993, co-founders have collaborated to put employees first and make our customers successful. When you work at a 100% employee-owned company, you're empowered to think and act like an owner. Whether you're interested in learning new skills or taking your career to the next level, we put our employees first so we can help make your professional goals happen. We believe that by investing in our people, we're investing in our company's future.


  • Additional source of substantial retirement
  • Employees share in ownership of MTSI without any personal contribution or
  • Our ESOP is the best way to ensure we
    maintain an enduring company
  • Participants receive both allocations of the annual company contributions and growth in account value as the shares of stock may appreciate

I take pride in watching the contribution
that our people have made toward national priorities.

Phil Soucy
Chairman of the Board
and Co-founder

Own your environment

See what it means to lead the nation’s defense and security.


At MTSI, we want our employees to live their best lives – personally and professionally. That’s why we offer employee-driven, industry-leading benefits and compensation, so you can explore and pursue passions. Most full-time employees are eligible for the following benefits:


Modern Technology Solutions, Inc. (MTSI) is seeking a Junior Systems Engineer to support Department of Defense (DoD), specifically U.S. Space Force/Space Systems Command (SSC)/CGN (Narrowband SATCOM Acquisition Delta), you will play a vital role in facilitating the transfer of defense equipment, services, and training to international partners.

Why is MTSI known as a Great Place to Work?

  • Interesting Work:  Our co-workers support some of the most important and critical programs to our national defense and security.  
  • Values: Our first core value is that employees come first.  We challenge our co-workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry. 
  • 100% Employee Ownership: we have a stake in each other's success, and the success of our customers.  It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year.  
  • Great Benefits - Most Full-Time Staff Are Eligible for: 
    • Starting PTO accrual of 20 days PTO/year + 10 holidays/year
    • Flexible schedules
    • 6% 401k match with immediate vesting
    • Semi-annual bonus eligibility (July and December)
    • Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account
    • Up to $10,000 in annual tuition reimbursement
    • Other company funded benefits, like life and disability insurance
    • Optional zero deductible Blue Cross/Blue Shield health insurance plan
  • Track Record of Success:  We have grown every year since our founding in 1993

Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and solutions company that provides high-demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity and Mission Assurance.

MTSI delivers capabilities to solve problems of global importance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

For more information about MTSI, please visit


As a Junior Systems Engineer with MTSI, you will support Department of Defense (DoD), specifically U.S. Space Force/Space Systems Command (SSC)/CGN (Narrowband SATCOM Acquisition Delta), you will play a vital role in facilitating the transfer of defense equipment, services, and training to international partners. Your responsibilities will primarily involve technical support, coordination, and liaison activities with CGN Mission Partners. You will work within a dynamic team environment, interfacing with various stakeholders across the DoD.

Your essential job skills and functions will include but may not be limited to:

  • Technical Assistance: You will provide technical support to defense systems, equipment, and services for potential Mission Partner cases and collaborate with senior engineers and program managers.
  • You will understand systems / system of systems architectures, particularly concepts behind satellite communications systems.

  • You will understand systems engineering principles, including technical requirements definition and system allocation.

  • You will understand project management and systems integration tasks and the importance of assessing the technical maturity and risks in development.

  • Demonstrate that you can work in a fast paced, dynamic environment.

  • You will provide systems engineering support services in delivering Mobile User Objective System (MUOS) access to ensure compliance with technical specifications and requirements.

  • Under the guidance of a senior engineer, you will provide systems engineering project management support and subject matter expertise in support of requirements development/review, CONOPS and Use Case development, and planning and support of verification and validation events.

  • Documentation and Reporting: You will assist in the preparation and review of technical documentation, including specifications, drawings, and technical manuals.

  • You will have knowledge of industry standards with the ability to learn specific standards and regulations related to space systems.

  • You should have some experience creating, editing, and presenting technical materials related to Department of Defense (DoD) acquisition programs.

  • Customer Liaison: You will serve as a point of contact for Mission Partners, addressing their technical inquiries, providing clarification on technical aspects of proposed systems, and facilitating communication between the customer and internal stakeholders.

  • Coordination: You will collaborate with external agencies, such as DISA, NIWC Pacific, and SSC.

  • You will participate in program management/project meetings, conferences, and reviews, including preparing agendas, meeting minutes, and tracking action items, developing, preparing, and providing graphics support for executive level briefs and presentations.
  • Training Support: You will assist in the development and delivery of technical training programs for Mission Partners on the operation, maintenance, and support of MUOS systems access.

  • Quality Assurance: You will participate in quality assurance activities to ensure that delivered defense equipment and services meet the specified technical requirements and quality standards.


  • Entry level, 0-3 years of work experience with U.S. Space Force/Space Systems Command (SSC).
  • Strong analytical and problem-solving skills with the ability to assess technical requirements and propose practical solutions.

  • Excellent communication and interpersonal skills, with the ability to effectively interact with individuals from diverse cultural backgrounds.

  • Proficiency in technical writing and documentation, with attention to detail and accuracy.

  • Willingness to travel domestically and internationally as needed.

  • Performing systems management, reduction, and analysis of C4ISR architecture data, development of systems of systems enterprise architecture, and architecture design tradeoffs, including application and interpretation of DODAF architecture principles.

  • Experience with global military UHF SATCOM, global Navy shore networks, and commercial or military WCDMA communication systems, Desired.

Education Requirements:  

  • Bachelor of Science degree preferably in Electrical Engineering, Systems Engineering, Network Engineering, Computer Engineering, Computer Science, Math, or Physics.

Clearance Requirements:

  • None to start (Secret clearance eligible).
  • U.S. Citizenship is required for this position.

The pay range for this position in California is $79,000/year to $94,000/year; however, base pay offered may vary depending on established government contract wages, job- related knowledge, skills, and experience, and other factors. MTSI also offers a full range of medical, financial, and other benefits, dependent on the position offered. Base pay information is based on market location. Applicants should apply via MTSI's internal or external careers site.





Apply Now

MTSI maintains an outstanding work environment that includes competitive compensation, outstanding benefits, the opportunity to be an employee-owner, and challenging work assignments with significant opportunities for advancement/career growth. To be considered for employment opportunities at MTSI, you must complete an online application.

EEO Statement: MTSI embraces nine core values including our first core value of Employees come first. Consistent with our Core Values, we are committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity/Affirmative Action-Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, military/veteran status, disability, or any other characteristics protected by law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants with physical and/or mental disabilities. If you are interested in applying for employment with MTSI and need special assistance or accommodation to use our website or to apply for a position, please send an e-mail with your request to Determination on requests for reasonable accommodation is made on a case-by-case basis.

MTSI posts all open positions of employment here on our official website Careers page. MTSI Recruiters will always make direct personal contact with candidates by either speaking directly via telephone call, face-to-face video conference, or in-person, and will never conduct interviews or extend offers of employment via text or using messaging applications. If you believe you may be the victim of employment fraud, we encourage you to contact the Federal Trade Commission (FTC) thru their website:

Opportunities at MTSI

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  • Engineering, San Diego, California, United StatesRemove

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