Senior Mission-Critical Systems Architect

Leidos; St. Louis (MO); On-site; USD 140,000 - 200,000; Full time

Job summary

Leidos is seeking a Sr. Systems Architect to lead the design and governance of mission-critical IT architectures for an Intelligence Community program.

This role requires translating complex requirements into scalable, secure design artifacts while collaborating with software engineers, product owners, and stakeholders in an Agile environment. The ideal candidate brings extensive experience with enterprise IT architectures, traceability, and formal modeling tools, along with a TS/SCI clearance

Qualifications

• US citizenship required per contract.
• Bachelor's degree in a technical discipline and 8–12 years of relevant experience.
• Active Top Secret/SCI clearance with ability to pass a polygraph.
• Experience designing and implementing enterprise-scale systems.
• Ability to map and manage complex traceability matrices.
• Experience with architecture tools (Sparx EA, Cameo, MagicDraw).
• Prior Intel/DoD contract experience.
• Knowledge of DoDAF and TOGAF.
• Strong writing and verbal communication skills.
• Analytical capabilities to deconstruct legacy architectures.

Responsibilities

• Analyze and mature IT architecture baselines into scalable design models.
• Develop, maintain, and govern architecture documentation across domains.
• Ensure traceability between architecture artifacts, requirements, and deployments.
• Use architecture tools to generate and manage blueprints and diagrams.
• Lead architectural planning, reviews, and cross-team execution.
• Collaborate with contract teams to align architecture with mission objectives.
• Identify design gaps, technical debt, or security risks and propose mitigations.
• Present complex concepts to technical and non-technical stakeholders.
• Ensure designs adhere to IC directives and EA standards.
• Mentor downstream development and engineering teams.

Skills

US citizenship

Traceability matrices

Technical writing

Analytical skills

Enterprise-scale systems design

Agile environment experience

Security/compliance mindset

Cross-functional collaboration

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 lead the design and governance of mission-critical IT architectures for an Intelligence Community program.

This role requires translating complex requirements into scalable, secure design artifacts while collaborating with software engineers, product owners, and stakeholders in an Agile environment. The ideal candidate brings extensive experience with enterprise IT architectures, traceability, and formal modeling tools, along with a TS/SCI clearance