Model Systems Engineer

*** To be considered for this role, you must be a US Citizen with an active US government security clearance. Additionally, you must either live near or be willing to move to the Boulder, CO area.***

Centil
, a Sabel Systems company, is a mission-focused engineering team supporting some of the highest-priority space defense programs in the U.S. Space Force portfolio, including missile defense and missile warning systems for Space Systems Command. Our work spans Dev Sec Ops , CI/CD product development, and space-domain systems engineering, and our people are embedded directly in the programs they support.

In January 2026, Sabel Systems acquired Centil to expand its Advanced Engineering Services capabilities. For our team, that means access to a broader portfolio of programs, deeper corporate resources, and new career pathways - while preserving the technical ownership and small-team culture that defines how we work. It's an exciting time to join Centil: we're growing, the mission portfolio is expanding, and we're building the team that will define what comes next.

If you are interested in learning more about Centil or our team, check out our website til.io.

This position is for a Model Based Systems Engineer in Boulder, CO. You will be working closely with a talented team to assist in the design, implementation, and maintenance of critical defense systems through classic and modern Systems Engineering techniques. Additionally, we are tasked with improving the overall project management discipline of our clients by increasing collaboration and innovation and introducing techniques that promote adaptability and flexibility in the face of unpredictable circumstances, and that optimize return on investment expenditures.

This person should have training and experience in Systems Engineering practices to support the mission design work, process definition, and baseline management, with deep experience in Model-Based System Engineering (MBSE). Experience with Overhead Persistent Infrared (OPIR) missions to be significant bonuses for this role. This role will work at the intersection of requirements development, systems design, and integration testing in a fast-paced defense environment.

This role will be onsite in Boulder, CO.

• Apply MBSE practices and tools to conduct requirements derivation, analysis, and documentation supporting common architecture definition and baseline design
• Contribute to and support the System Requirements Review (SRR) and Critical Design Review (CDR) processes
• Participate in derivation and traceability of test design and contribute to associated technical documentation
• Support development of an Integration and Test Prototype (ITP) as part of the CDR effort
• Work as an integrated team member applying Agile principles to manage and execute Work In Progress
• Support integration, test, and Operational Acceptance (OA) activities across government-directed sites in later phases
• Participate in proposal support activities as the program progresses through gates

• Active DoD security clearance (Secret minimum; TS/SCI preferred)
• 5+ years of experience in systems engineering, with demonstrated application of MBSE methodologies
• Proficiency in MBSE tools (e.g., Cameo)
• Experience with requirements derivation, management, and traceability
• Familiarity with DoD acquisition processes, systems reviews (SRR, CDR), and defense program documentation standards
• Experience with integration and test environments a plus
• Bachelor's degree in Engineering, Computer Science, or related technical field

• Background in radar, ground systems, space systems, or related DoD mission areas
• Experience on Space Force or Missile Defense Agency programs
• Familiarity with Agile systems engineering practices
• Prior work on prototype development or operational acceptance programs

In addition to job-specific requirements, Centil believes it is important for all employees to possess the following skills/characteristics:

• Strong communication (written and verbal) and presentation skills. Ability to passionately deliver high-level…