Senior OneStream Consultant

Elevate your career with MANTECH International Corporation! Join a dynamic team dedicated to national security through cutting‑edge technology. Since 1968, MANTECH has led in delivering advanced solutions to government intelligence, the Department of Defense, and Federal Civilian sectors. Dive into innovation in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Your journey to impactful work and rapid growth starts now—be extraordinary at MANTECH!

*** This is for a future opportunity***

MANTECH seeks a motivated, career and customer-oriented Senior One Stream Consultant to join our team. This is a fully remote opportunity.

At MANTECH, we are re‑engineering the financial backbone of the U.S. Government. We provide highly configured, mission‑critical Planning, Programming, Budgeting, and Execution (PPBE) and Financial Close and Reporting solutions leveraging the One Stream platform.

As a Senior One Stream Consultant, you will serve as a technical lead and subject matter expert for our most complex implementations. You will work as the Architect, designing entire application modules, translating functional requirements into technical blueprints, and guiding a team of Lead Consultants and Associate Consultants to deliver high‑performance solutions. You will own the technical quality of the application, ensuring performance business rules, streamlined security, and scalable data models.

• Translate complex functional PPBE and government financial close requirements into technical architecture blueprints, system designs, and multidimensional data models (Cubes, Dimensions, Member Hierarchies) built for performance and scalability.
• Own the overall technical quality of application deliverables; establish development standards, conduct code reviews, enforce best practices across business rules, custom dashboards, and data integration pipelines.
• Architect, write, and optimize complex custom Business Rules (Finance, Parser, Connector, Event) using , custom assemblies, and advanced SQL procedures to extend platform functionality.
• Lead system health, memory, and query tuning efforts; diagnose bottlenecks, troubleshoot complex application log traces, and optimize data loading and consolidation processing times.
• Direct end-to-end integration strategies, including automated data pipelines, REST API integrations, security roles/group architecture, Single Sign-On (SSO) configuration, and Authority to Operate (ATO) technical artifact preparation.
• Serve as the primary technical Subject Matter Expert (SME) in client-facing architecture sessions; identify technical project risks, articulate mitigation strategies, and present solutions to senior government stakeholders.
• Provide technical guidance, task delegation, and mentorship to One Stream Developers and Associate Consultants across the software development lifecycle within an Agile/Scrum environment.
• Listen carefully to client and team needs, look beyond immediate "easy" solutions, and work collaboratively across MANTECH to deliver high-impact, high‑quality outcomes that exceed customer expectations.

• Bachelor’s degree in Computer Science, Systems Engineering, Information Systems, or a related field.
• 10+ years of progressive work experience in systems design, infrastructure, performance tuning/optimization, cloud architecture, software development, and deployment.
• 5+ years of hands‑on One Stream development and technical lead experience on enterprise implementations, demonstrating a track record of successful project delivery.
• 4+ years of One Stream XF installation, environment configuration, database management, and system optimization experience.
• Advanced…