Principal Engineer, Solutions Architecture Security Clearance

Position: Principal Engineer, Solutions Architecture with Security Clearance
Location: True

Overview LMI is seeking a Principal Engineer, Solutions Architecture with strong hands-on development skills and a talent for agentic AI to join the Chief Technology Office development team. This role is for someone who doesn't just write code - they see the whole system, spot the real problem behind the request, and design the solution before they build it. You'll move fast across a portfolio of high-stakes programs, using agentic AI as leverage to turn architecture into working software s position requires an active Secret security clearance.

LMI is a new breed of digital solutions provider dedicated to accelerating government impact with innovation and speed. Investing in technology and prototypes ahead of need, LMI brings commercial-grade platforms and mission-ready AI to federal agencies at commercial speed. Leveraging our mission-ready technology and solutions, proven expertise in federal deployment, and strategic relationships, we enhance outcomes for the government, efficiently and effectively.

With a focus on agility and collaboration, LMI serves the defense, space, healthcare, and energy sectors - helping agencies navigate complexity and outpace change. Headquartered in Tysons, Virginia, LMI is committed to delivering impactful results that strengthen missions and drive lasting value. Responsibilities Responsibilities:
Providing direct support to multiple customers, this Principal Engineer, Solutions Architecture will:
* Diagnose before you build:
Analyze customer requirements and program objectives to uncover the underlying problem, not just the stated request, and design solutions that align with mission needs.
* Architect across the stack:
Design end-to-end solutions - from data model to API to UI - that are scalable, maintainable, and fit the constraints of large, complex government programs.
* Leverage agentic AI as a force multiplier:
Use advanced agentic AI tools to rapidly prototype, extend, and integrate new functionality into existing code stacks, compressing the distance between idea and working system.
* Drive high-impact, ambiguous problems:
Make quick, high-impact contributions to strategically critical projects, often stepping into programs with incomplete requirements and shaping them into a coherent technical plan.
* Translate between worlds:
Collaborate with development teams, stakeholders, and technical leads to identify pain points in existing systems, propose creative solutions, and build consensus around the right architecture.
* Move fluidly across programs:
Transition seamlessly between programs, applying technical and design judgment to prioritize the highest-impact initiatives.
* Close the loop:
Facilitate integrations, resolve technical challenges, and adhere to development timelines within multidisciplinary teams.
* Build for the mission, not just the ticket:
Ensure compliance with security protocols, government standards, and industry best practices across all projects.
* Multiply your impact through documentation:
Document technical solutions, design rationale, and architectural decisions for knowledge transfer between teams and programs.
* Validate the design, not just the code:
Conduct rigorous testing to guarantee performance, scalability, and reliability of updated or newly architected systems. Qualifications

Minimum Qualifications
* Active Secret clearance
* 3-5 years applying full-stack development in a production environment.
* Demonstrated solutions mindset:
Experience translating ambiguous requirements into a technical design or architecture, not just implementing pre-defined tickets.
* Experience with agentic AI coding tools: demonstrated proficiency using tools to enhance existing code stacks at scale.
* Proven full-stack development experience: minimum of 3-5 years developing, maintaining, and improving front-end and back-end systems.
* Proficient in at least one back-end language (Python preferred) and one front-end framework/tool (Type Script preferred).
* Experience designing and consuming RESTful APIs for integration across systems.
* Strong foundational skills across relational (e.g., PostgreSQL, MySQL, SQL Server) and non-relational (e.g., MongoDB) databases.
* Comfortable operating in agile environments and collaborating across multidisciplinary teams.
* Version control proficiency:
Git (Git Lab preferred).
* Experience with testing, security, Dev Sec Ops , and CI/CD processes.
* Strong communication and influence skills: able to pitch a technical solution to both engineers and non-technical stakeholders, and defend the "why" behind an architecture, not just the "how." Desired Skills
* Advanced proficiency in agentic AI tools, including designing multi-step or multi-agent workflows to accelerate development.
* Experience with cloud environments (AWS, Azure, or Google Cloud) for designing and deploying cloud-based solutions.
* Microservices and containerized architecture experience (Docker, Kubernetes).
* UI/UX design sensibility - knowledge of…