Senior Mission-Critical Systems Architect (TS/SCI)

Leidos Inc; St. Louis (MO); On-site; USD 108,000 - 195,000; Full time

Job summary

Leidos is seeking a Sr. Systems Architect to help design and deliver accurate, meaningful architecture and design products for a national security mission.

You will collaborate with software engineers, systems engineers, product owners, testers, and mission stakeholders in an Agile environment to transform challenging requirements into viable design artifacts and documentation across system, data, and security domains. Multiple locations include St. Louis, MO.

Qualifications

• US citizenship is required per contract.
• Bachelor's degree in Computer Science, Computer Engineering, Systems Engineering or related technical discipline with 8–12 years of prior relevant experience or equivalent.
• Active Top Secret/SCI with the ability to pass a Polygraph examination.
• Experience designing and implementing complex, enterprise-scale systems and solutions.
• Ability to map and manage complex traceability matrices between design artifacts and requirements.
• Experience with architecture tools (Sparx EA, Cameo, MagicDraw).
• Senior experience on Intel/DoD contract teams and knowledge of DoDAF/TOGAF.
• Strong technical writing and communication skills.

Responsibilities

• Analyze and mature existing IT architecture baselines into comprehensive, accurate, and scalable design models.
• Develop, maintain, and govern detailed IT architecture documentation across system, data, and security domains.
• Establish and maintain traceability between architectural artifacts, mission requirements, and deployed solutions.
• Use architecture tools to generate and manage structural blueprints and diagrams.
• Integrate architectural planning, review, and execution.
• Collaborate with cross-functional contract teams to align with mission objectives.
• Identify design gaps, technical debt, or security risks and architect viable mitigation strategies.
• Lead technical reviews and present complex architectural concepts to stakeholders.
• Ensure IT designs adhere to Enterprise Architecture standards and IC directives.
• Provide mentorship and architectural guidance to downstream development and engineering teams.
• Drive continuous improvement in documentation standards and architecture modeling practices.

Skills

Architectural design

Enterprise architecture

Model-based systems engineering

Technical writing

Agile methods

Education

Bachelor's degree in Computer Science, Computer Engineering, Systems Engineering or related technical discipline

Master's degree (preferred)

Tools

Sparx EA

Cameo

MagicDraw

Job description

Leidos is seeking a Sr. Systems Architect to help design and deliver accurate, meaningful architecture and design products for a national security mission.

You will collaborate with software engineers, systems engineers, product owners, testers, and mission stakeholders in an Agile environment to transform challenging requirements into viable design artifacts and documentation across system, data, and security domains. Multiple locations include St. Louis, MO.