Strategic Requirements Systems Engineer

Modern Technology Solutions, Inc. (MTSI) is seeking a Strategic Requirements Systems Engineer to join our team in El Segundo, CA.

MTSI's National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence and national security communities. In this position, your work will have a profound impact on the country’s most critical role – protecting our national security.

The MILSATCOM Systems Engineering, Integration and Test (MSEIT) team in support of Space Systems Command (SSC) in El Segundo is seeking an individual to provide requirements development and management support for the Military Satellite Communications (MILSATCOM) Capability area. The MILSATCOM portfolio of programs has an ongoing need for IA/Cybersecurity support, to meet the needs of our emerging next-generation protected SATCOM.

The MSEIT contract provides leading-edge Systems Engineering & Integration (SE&I) support for the U.S. Space Force’s SSC. We support the Space Force’s acquisition of state-of-the-art MILSATCOM systems, providing global secure, survivable, and protected communications for our nation’s warfighters. We seek technical individuals who will thrive in a highly collaborative work environment of small teams, using the most modern tools and methodologies to tackle the challenges of integrating complex space and ground communications systems.

Key Responsibilities:

Develop, author, and maintain Interface Control Documents (ICDs) for cross-system interfaces between space (including spacecraft and payloads) and ground segments.

Work closely with the Configuration Management team in preparing for Engineering Review Boards (ERBs) and Configuration Control Boards (CCBs)

Develop interface diagrams, data dictionaries, message formats, command and telemetry mappings, and system‑level interface descriptions.

Identify interface risks and drive technical issue resolution across engineering teams.

Support system integration and test activities by providing authoritative interface documentation and clarification.

Ensure that documentation complies with best practices, program standards, and regulatory requirements.

Provide technical Subject Matter Expert (SME) support to review of Prime contract Change Proposals

Manage and coordinate Interface Control Working Groups (ICWGs), ensuring consistent communication across all stakeholders.

Work closely with MSEIT modeling team to ensure models align with relevant ICDs and requirements flowdown associated with the cybersecurity technical baseline.

Develop acquisition and technical requirements-related briefings, plans, papers, and other documentation in support of Gov’t decision making. Collaborating with prime contractors, other support contractors, government civilians, and members of the U.S. Space Force

Work Environment:

Location: On-site

Travel Requirements: Minimal

Working Hours: Standard

Qualifications:

Required:

Eligible for SECRET/TS/SCI clearance

Bachelor’s degree in engineering, computer science, or related technical field.

8+ years of experience in satellite systems, spacecraft development, or aerospace engineering.

5 years’ experience working on DoD programs

Direct experience developing or managing Interface Control Documents (ICDs) for complex systems.

Strong familiarity with spacecraft subsystems (e.g., payloads, RF comms, power, GNC, thermal, propulsion, on-board Command and Data Handling).

Ability to read and create schematics, interface diagrams, and data communication structures.

Experience with systems engineering tools (e.g., DOORS, Jama, Cameo).

Excellent technical writing, documentation, and communication skills.

Strong interpersonal skills, communication (oral and written), and presentation skills

Demonstrated ability to clearly articulate ideas, recommendations and options to customers, senior leaders, and stakeholders

Proficient in Microsoft Office products (e.g., Word, Excel, PowerPoint)

Due to security requirements, work is required to be performed on-site in a secure facility

Desired Skills and Experience:

SECRET/TS/SCI clearance

Master’s degree in engineering, computer science, or related technical field.

12+ years’ experience with space systems in support of space or ground segment development

12+ years’ experience in a space acquisitions environment

Experience in satellite hardware and software development

Proficient in usage of model-based systems engineering (MBSE) tools

Professional certifications (e.g., PMP, INCOSE CSEP / ESEP / ASEP)

Compensation: The pay range for this position in California is $135,000/year to $170,000/year; however, base pay offered may vary depending on established government contract ranges, 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. Applications will be accepted on an ongoing basis. This posting will be renewed periodically until the position is filled.

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Perks and Benefits

Vacation:

New Hires Accrue 20 days of PTO and 10 Holidays per Year

Health Insurance:

Zero Deductible Health Plans

Flexible Schedules:

Flex Schedules

Professional Development:

Up to $10,000 Annual Education/Training Reimbursement

ESOP:

Funded Stock Ownership Plan

401k Match+:

6% 401k Match + Immediate Vesting

Bonus Program:

Semi-Annual Bonus Opportunity

Mentorship:

Career Mentorship Programs

Why is MTSI 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 Owned:

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 up to $9k annually

Semi-annual bonus eligibility (July and Decemeber)

Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account

Up to $10,000 in annual educational 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 visitwww.mtsi-va.com

Why is MTSI 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 Owned: 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 up to $9k annually

Semi-annual bonus eligibility (July and Decemeber)

Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account

Up to $10,000 in annual educational 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 www.mtsi-va.com