Principal Software Architect (C#/.Net)

Leidos is partnering with the Department of Defense's Military & Family Life Counseling (MFLC) Program to deliver digital health, data, mobile, and enterprise IT platforms supporting military service members and their families worldwide. MFLC operates a multi-platform environment consisting of cloud infrastructure, mobile devices, enterprise applications, data platforms, analytics, and security controls that must function as a single integrated system.

Leidos is seeking a Principal Software Architect to serve as the technical authority for this environment, responsible for defining, integrating, and governing MFLC's end-to-end architecture across applications, data, infrastructure, security, and integrations.

This is a hands-on leadership role that combines enterprise architecture, system integration, security, and delivery ownership across the full MFLC technology ecosystem.

This position is Remote


Primary Responsibilities:

• Primary focus on designing and implementing health IT solutions for Leidos' federal health customers with a focus on interoperability with external and community providers
• Serve as the accountable technical authority for MFLC's enterprise architecture across application, data, infrastructure, security, and integration domains
• Define and govern reference architectures, integration patterns, and technical standards for all MFLC platforms
• Architect and oversee solutions supporting PIC, SLA dashboards, finance systems, time sheets, mobile platforms, and analytics
• Design and govern API-based, service-oriented, and event-driven architectures, integrating multiple internal and external systems
• Evaluate and recommend COTS, SaaS, and cloud solutions aligned to customer, compliance, and cost objectives
• Lead the design, integration, validation, and fielding of enterprise-scale solutions
• Ensure all solutions meet DoD, NIST, Zero Trust, IL-4+ cloud, and audit/compliance requirements
• Develop architecture artifacts, including system diagrams, data flows, security models, executive briefings, and roadmaps
• Provide technical leadership across Data, Infrastructure, and Software Engineering teams
• Perform cost, risk, and trade-off analyses to guide platform and cloud investment decisions
• Partner with program leadership to ensure architecture supports schedule, budget, and SLA commitments
• Resolve highly complex problems using significant application of technical knowledge, conceptualizing, reasoning, and interpretation
• Architect the integration of commercial products and software solutions to meet functional requirements while working within the constraints of the client's IT and cyber infrastructure
• Effective communication style for leading daily engagement with external and internal stakeholders to facilitate the project team's efforts and remove roadblocks
• Development and implementation of modern Data solutions and architectures using Superset or equivalent BI Platforms
• Participation in Scrum sprint ticket fulfillment as required for the data team, development, and Infrastructure

Required Qualifications

• BS degree with 12 - 15 years of prior relevant experience or Masters with 10 - 13 years of prior relevant experience. Consideration will be given for years of experience without a college degree
• Must have advanced experience with C# and Microsoft .NET Framework, and experience with Git
• Must have advanced Linux administration and AWS architecture experience to include RHEL and experience with risk and defense strategy development in a Gov-Cloud environment, configuring and deploying AWS environments to include servers, load balancers, VPCs, etc.
• Experience with JavaScript, JS frameworks, and Vue
• Must have advanced knowledge with relational and non-relational databases such as SQL, Kafka, Trino, or DBT, and BI solutions such as Tableau or Superset, and defining data models, data governance, and data quality frameworks
• Experience with Identity and access management concepts, designing identity, access, logging, and audit architectures
• Experience designing multi-system enterprise platforms spanning application, data, identity, and infrastructure layers
• Experience building and governing reference architectures, integration patterns, and technical standards
• Experience designing API-driven architectures and event-driven systems for cross-team integration
• Experience supporting systems subject to DoD, NIST 800-53, FedRAMP, or RMF controls and ATO accreditation packages
• Experience designing enterprise data platforms (ingestion, transformation, analytics, and BI)
• Experience enabling executive dashboards, SLA tracking, and operational analytics
• Strong background in code review processes and architectural fitness functions to validate and maintain system quality

Preferred Qualifications

• Cloud Architect experience (Amazon, Azure, OCI, Google Cloud Platform)
• TOGAF or equivalent Enterprise Architecture certification
• SAFe or other Agile and Mission Software certifications
• CISSP or CCSP (for cloud/security)

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:
January 16, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.