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!

MANTECH seeks a motivated, career and customer-oriented OneStream Consultant to join our team.

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. This is a fully remote opportunity.

As an experienced OneStream Developer , you will build, test, and integrate core platform components and financial logic. Operating between entry-level configuration and senior platform architecture, you will own technical delivery for key modules, write custom business rules, design data integrations, and support compliance and security efforts.
Responsibilities include but are not limited to:

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Design, write, test, and troubleshoot custom OneStream Business Rules (Finance, Parser, Connector, Event Rules, and Member Formulas) using VB.NET or C# to implement complex financial calculations and client business logic.

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Configure and maintain Workflow Profiles, Confirmation Rules, Transformation Rules, and Data Management sequences to support complex financial reporting and budgeting processes (including federal budgeting standards where applicable).

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Build and customize Cube Views, BI Viewer dashboards, Extensible Documents, and custom reports to deliver accurate, actionable financial insights for executive leadership and operational management.

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Design, build, and optimize data conversion and data load artifacts, SQL scripts, database views, and staging tables for smooth data migration, extraction, and validation across all project phases.

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Support platform integrations, security model configuration, Single Sign-On (SSO) setup, and technical documentation required for system governance and compliance packages (e.g., ATO compliance).

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Actively participate in all SDLC phases (systems analysis, design, build, configuration, and testing); perform unit testing, root-cause trace analysis, and system performance tuning on application components and custom code.

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Identify technical risks, formulate mitigation options, and escalate unresolved blockers to project management to ensure high-quality software solutions and on-time project delivery.

Minimum Qualifications:

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Bachelor’s degree in Computer Science, Systems Engineering, Information Systems, or a related field.

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7+ years of overall professional consulting or military experience

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4+ years of hands-on OneStream development experience (or equivalent CPM/EPM platform development experience demonstrating a track record of successful project delivery).

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1+ years of experience with OneStream XF configuration, installation support, or optimization.

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Proficiency in object-oriented programming using C# or VB.NET, along with practical SQL experience (SQL Server or Oracle) for data manipulation and querying.

Preferred Qualifications

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Master’s degree in Computer Science, Engineering, or Information Systems.

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OneStream Certified Specialist (OCS) in Reports & Dashboards or Financial Close, or OneStream Certified Professional (OCP) – Core Platform.

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Hands-on experience setting up Single Sign-On (SSO) and assisting with federal Authority to Operate (ATO) compliance procedures.

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Prior experience in professional services or federal IT consulting environments.

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Functional understanding of Corporate Performance Management (CPM) or Federal Financial Management concepts (e.g., Consoli