NewPrincipal Systems Engineer (API Gateway) - TS/SCI w CI Poly Modern Government SolutionsPrincipal Systems Engineer (API Gateway) - TS/SCI w CI PolySterling, VAFull timeBachelor's degree in Systems Engineering, Computer Science, Computer Engineering, Software Engineering, Information Technology, Electrical Engineering, Mathematics, Physics, or a related field.16+ years of experience designing, integrating, and supporting enterprise systems, cloud architectures, and API-driven solutions within complex mission environments.5+ years of experience implementing and administering API gateway technologies in cloud-based architectures; Experience designing secure APIs and enterprise integration solutions utilizing REST, GraphQL, event-driven architectures, message queues, streaming platforms, or ETL pipelines. TITLE: Principal Systems Engineer (API Gateway)LOCATION: Sterling, VA (Relocation assistance considered)CLEARANCE REQUIRED: Active TS/SCI with CI PolyEMPLOYMENT TYPE: Full-time, Onsite POSITION SUMMARYModern Government Solutions (MGS) is seeking a Principal Systems Engineer to architect, integrate, and secure mission-critical API ecosystems supporting next-generation national security capabilities.
Principal Product Manager CventPrincipal Product ManagerTysons Corner, VirginiaFull timeFounded in 1999, Cvent delivers a comprehensive event marketing and management platform for marketers and event professionals and offers software solutions to hotels, special event venues and destinations to help them grow their group/MICE and corporate travel business. This is not a people-management role; it’s a high-impact thought-leadership and execution role for a seasoned product leader who thrives in uncharted territory and reliably drives company-defining initiatives from discovery through measurable impact.
Principal Business Analyst - (Functional - Oracle E‑Business Suite - EBS) CventPrincipal Business Analyst - (Functional - Oracle E‑Business Suite - EBS)Tysons Corner, VirginiaFull timeFounded in 1999, Cvent delivers a comprehensive event marketing and management platform for marketers and event professionals and offers software solutions to hotels, special event venues and destinations to help them grow their group/MICE and corporate travel business. Experience in configuring Oracle Modules - General Ledger, Payables/Payments, Receivables, Fixed Assets, Cash Management, Revenue Management, Sub Ledger Accounting and EBTax.
Principal/Lead Nuclear Engineer Mpr Associates, Inc.Principal/Lead Nuclear EngineerAlexandria, VirginiaFull timeOversee MPR engineers performing neutronics simulations and core design: criticality safety evaluations, critical core configurations, fuel cycle management, activation calculations, radiation detection and shielding analyses: alarm setpoint determination, shielding optimization, ALARA implementation, dosimetry calculations. The role requires deep expertise in or an ability to quickly master several nuclear engineering related topics, including neutronics, thermal hydraulics, shielding, fuel and nuclear materials, and radiological consequence evaluation combined with strong communication skills, adherence to best practices, and an eye for growing MPR's portfolio.
Cloud Engineer Sr. Principal - TS/SCI with Polygraph GD Information TechnologyCloud Engineer Sr. Principal - TS/SCI with PolygraphChantilly, VirginiaTechnical skills: Experience managing AWS and Azure hybrid/multi-cloud environments; experience with RHEL system administration; strong proficiency with IaC tools; solid understanding of networking concepts; experience with containerization, orchestration, and serverless technologies; strong knowledge of cloud security principles and best practices; familiarity with monitoring and logging tools. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available.
Workday Specialist/Principal/Architect Maryland Environmental ServiceWorkday Specialist/Principal/ArchitectMillersville, MarylandAdditional responsibilities include leading Workday implementation and maintenance across multiple modules including Security, Human Capital Management (HCM), Financial, Spend (Procurement), Talent, Payroll and Workforce Management. Current MES Employees who are interested in applying for this position must visit the Internal MES Careers Page by going to their Workday Dashboard, clicking on the Career icon and selecting Find Jobs.
Principal Marketing Analyst Roth Staffing CompaniesPrincipal Marketing AnalystBethesda, Maryland$69.71–$91.34 / hourThe role proactively mobilizes and aligns the right analytical resources (e.g., measurement, experimentation, and reporting/BI partners) to solve business problems and to support planning, launch, and post-launch readouts with timely, decision-ready insights. In a Go-to-Market (GTM) support capacity, this role serves as the primary embedded analytics partner for a designated line of business, translating business objectives into clear analytical questions, success metrics, and measurement plans.
NewPrincipal Space Systems Research and Development Engineer BlackSkyPrincipal Space Systems Research and Development EngineerHerndon, VA$180,000–$215,000 / yearAs a principal engineer in the Space Systems R&D group, you will lead the technical development of a portfolio of innovative satellite-related technologies to deliver validated, high-impact prototypes that are ready for integration into BlackSky’s operational capabilities. To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.
Principal Value Advisor, Value Management Office AtlassianPrincipal Value Advisor, Value Management OfficeWashington DC, Washington, DC$228,000–$297,667 / yearExtensive experience in value management and proven track record of leading complex, cross-functional engagements across a broad range of customer industries. Responsibilities: The Value Management Office exists to infuse all interactions and engagements towards the fulfillment of the customers’ strategic business needs with joint ownership of their long term success .
Principal Architect - Active Top Secret required GD Information TechnologyPrincipal Architect - Active Top Secret requiredWashingtonTo ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave.
Principal Data Scientist - Gen AI XometryPrincipal Data Scientist - Gen AINorth Bethesda, MDIn this role, you will serve as a technical leader, owning a 12 month technical roadmap, driving large-scale cross-functional ML and AI initiatives, and setting the long-term scientific direction for AI-driven solutions that enhance Xometry's service offerings. Generative AI Development: Develop and deploy generative AI models and large language models (LLMs) for multimodal document processing, focusing on extracting structured data from technical drawings, purchasing orders, and other complex documents.
Principal Software Reverse Engineer STRPrincipal Software Reverse EngineerArlington, VA$204,000–$284,000 / yearReverse engineering complex software or firmware targets, ranging from typical Windows/Linux binaries to embedded firmware running non-traditional computer architectures and operating systems. Offers are based on factors, such as but not limited to, the candidate's experience, education, training, key skills/critical skills, security clearances, and prevailing market and business conditions.
Principal Technical Staff (CLEARANCE REQUIRED) STRPrincipal Technical Staff (CLEARANCE REQUIRED)Arlington, VA$220,000–$260,000 / yearThe Signals Exploitation and Tracking (SET) Group in the Analytics and C2 Division focuses on applying machine learning, statistics, estimation theory, and information theory algorithms for signals exploitation, target tracking, predictive analytics, and system resource management. This position requires leading continued development of relevant technology products, as well as leading a portfolio of research and development programs, specifically focused on delivering advanced algorithm and software solutions for the Intelligence Community and Department of Defense.
Senior Principal, ML/AI XometrySenior Principal, ML/AINorth Bethesda, MDPlay a leadership role in identifying areas of opportunity — e.g., using ML/AI to unlock new revenue streams (e.g., rapid quoting for new manufacturing modalities, generative design for customers), reduce cost (e.g., automated quality inspection), or optimize efficiency (e.g., 3D-geometry classification, defect detection, generating manufacturing ready models). Stay ahead of industry developments in ML, AI, generative AI, 2D/3D modeling and manufacturing tech; translate insights into the improvement of internal best practices, tooling, frameworks, model governance, data pipelines, and operationalization.
Principal Defense Systems Analyst STRPrincipal Defense Systems AnalystWashington, DC$220,000–$260,000 / yearWe focus on the capability and limitations of ground, air, and space sensing and counter-sensing platforms (both crewed and uncrewed) and the resource management of these assets in the service of the survivability and capability of US air and space assets (e.g., the F-35 Joint Simulation Environment) using the methods of operational and systems analysis. You will lead and advise fellow researchers, scientists, and engineers on multi-disciplinary teams spread across multiple STR campuses to understand customer objectives, craft strategic plans, lead proposal efforts, and develop innovative solutions to complex and challenging national security problems.
Principal Software Engineer XometryPrincipal Software EngineerNorth Bethesda, MD$200,000–$225,000 / yearYou Would Be A Great Fit With: CAD/PLM Domain Expertise: Broad experience working within enterprise engineering software ecosystems (e.g., Dassault/SolidWorks, Autodesk, or similar major platforms). Xometry's digital marketplace gives manufacturers the critical resources they need to grow their business while also making it easy for buyers at Fortune 1000 companies to tap into global manufacturing capacity.
Principal Model-Based Systems Engineer STRPrincipal Model-Based Systems EngineerArlington, VA$206,000–$284,000 / yearThe ideal candidate will be well-versed in Systems Engineering techniques, Modeling and Simulation, Digital Engineering/MBSE and be excited about opportunities to mentor more junior staff and help foster growth of subject matter expertise across the organization. In addition to modeling in SysML, the Systems Engineer will be responsible for implementing and guiding teams in the customization and automation techniques offered by Cameo to enable multi-disciplinary programs to comply with DoD Digital Engineering goals.
Principal Computational Engineer, 3D CAD & Geometric Intelligence XometryPrincipal Computational Engineer, 3D CAD & Geometric IntelligenceNorth Bethesda, MDDFM & Sub-Process Intelligence: Drive the methodology for combining classical computational geometry (B-Rep traversal, parametric surface analysis, medial axis, geodesic distance, curvature analysis) with modern learning-based approaches (graph neural networks on B-Reps, point-cloud and voxel encoders, differentiable geometry, neural implicit representations) to detect manufacturability risk across 12+ CNC sub-processes and the broader process catalog. AI/ML Fluency: Familiarity with ML/AI methods relevant to geometry — graph neural networks on B-Reps (BRepGAT, BRepFormer, AAGNet, UV-Net), point-cloud / voxel / SDF encoders, neural implicit representations, NURBS-aware learning — and clear judgment about when classical methods beat learned ones.
Senior Principal Directory Services Architect GD Information TechnologySenior Principal Directory Services ArchitectWashingtonTo ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave.
Design Principal Little CareersDesign PrincipalMc Lean, VirginiaPartnering with a transdisciplinary team, you’ll listen intently, ask insightful questions, surface and frame the real challenges, generate and test ideas, and guide teams toward solutions that measurably advance your clients’ strategic and operational goals. A renowned design firm seeking a Design Principal who will continually elevate the quality of our work in the DC (Tysons Corner) office through positive leadership, a collaborative work style, and deep design expertise.