Senior OneStream Consultant

MANTECH seeks a motivated, career and customer-oriented Senior OneStream 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 OneStream platform.

As a Senior OneStream 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.

Responsibilities include but are not limited to:

• 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 VB.NET/C#, 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 OneStream 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.

Minimum Qualifications:

• 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 OneStream development and technical lead experience on enterprise implementations, demonstrating a track record of successful project delivery.
• 4+ years of OneStream XF installation, environment configuration, database management, and system optimization experience.
• Advanced proficiency in object-oriented programming with VB.NET or C# for custom business rules and assemblies.
• SQL expertise (SQL Server or Oracle) for complex data manipulation, query optimization, and staging table architectures.
• Deep understanding of Corporate Performance Management (CPM/EPM) concepts, multidimensional OLAP cubes, and complex financial rules/consolidations.

Preferred Qualifications:

• Master's degree in Computer Science, Engineering, or Information Systems.
• Experience with the federal Planning, Programming, Budgeting, and Execution (PPBE) process or federal financial management systems.
• OneStream Certified Professional (OCP) - Lead Architect or Core Platform certification. Government Financial Manager (CGFM) certified or Certified Defense Financial Manager (CDFM).CompTIA Security+ certification.
• Hands-on experience supporting government Authority to Operate (ATO) processes and federal security baseline standards.
• Prior experience in management consulting or professional services.

Clearance Requirements:

• US Citizenship with the ability to obtain aPublic Trust clearance or higher.

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.
• Frequently communicates with co-workers, management, and customers, which may involve delivering technical presentations and architecture reviews.
• Must be able to exchange accurate technical information in these situations.