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Modern Technology Solutions Inc

Strategic Interfaces Systems Engineer

El Segundo, CA, United States
El Segundo, United States

On-site

$135,000 to $169,000 USD / year

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Job details

Pay: $135,000 to $169,000 USD / year
Workplace: On-site
Apply by: May 8, 2027
Posting language: English
Posted: Nov 9, 2026

Original job description

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

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.
Serve as the system-level ICD owner/book boss, responsible for coordinating inputs, maintaining document structure, adjudicating comments, and ensuring the ICD reflects the authoritative technical baseline.
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 Working Groups, 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 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:

Ability to obtain and maintain a Secret clearance is required for this position
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, 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)

Desired Skills and Experience:

Active SECRET or higher 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
Experience in Military, DoW, or Intelligence Community space
Experience with MILSATCOM, such as ESS, AEHF, EPS, PTES, PTS, WGS, and FAB-T terminal programs
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 $169,000/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.

#MTSI #MTSIJOBS #MSEIT

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More about this job

Skills

ICT system integration
Documentation
Communication skills
Cybersecurity
Decision making
Computer science
Aerospace engineering
Technical writing
Interpersonal skills
Presentation skills
Microsoft Office
Microsoft Word
Microsoft Excel
Microsoft PowerPoint
Ground segment
Software development
PMP

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