Provide support to other accounting staff and work on special projects as assigned.
Investigate billing errors, resolve discrepancies, and reconcile unbilled job costs;
Provide support in contract and job close out process; and
Submit invoices through various commercial and government payment portals (Serengeti, WAWF, Collaborati, Taulia, etc)
Effectively communicate with Project Managers regarding contract documents, purchase orders, change orders, and other contract modification, approvals, and any additional services related to billing;
Prepare accurate and timely commercial and government invoices with supporting documentation, on a monthly basis in accordance with project-specific contract terms (most common contract mechanisms include Time & Materials, Firm Fixed Price, and Cost Reimbursable);
Review new projects billing setup and monitor the status of existing projects in the accounting system for billing accuracy;
Maintain project billing folder and accounting system to ensure all invoices and other project accounting-related documents are readily accessible for project managers and the accounting department;
Requirements
irapt
deltek ajera
ms excel
bachelor's
2 years
communication
Federal government billing experience, knowledge of iRAPT/WAWF, GSA, and other billing portals a plus;
Strong written and verbal communication skills.
Knowledge of Deltek Ajera accounting software is preferred;
Excellent analytical and problem solving skills; and
Government Contracts Billing terms abstraction knowledge a plus;
Bachelor’s degree in Accounting/Finance or similar field strongly preferred; candidates with an Associate’s degree will be considered based on experience;
Ability to understand contract agreements, purchase orders, change orders, contract funding and billing requirements;
Proficient in MS Excel, Adobe Acrobat and MS Word;
Minimum 2 years of job costing, contract billing, and general accounting experience;
Experience in professional services firm such as engineering, architectural, government or construction industries strongly preferred;
Benefits
Information not given or found
Training + Development
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Interview process
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Visa Sponsorship
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Security clearance
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Company
Overview
Founded in 1986
Company History
The company was established in Houston as a small technical consultancy.
GSI Environmental grew into an international firm solving environmental puzzles.
From its headquarters in Texas, the company tackles projects across multiple continents.
Renowned for data-driven fieldwork, GSI specializes in groundwater, air, stormwater, and wastewater permitting to support industrial and property development.
Typical projects include complex site investigations, remediation efforts, and environmental permitting for industrial operations and infrastructure.
GSI blends hands‑on engineering with advanced hydrologic and toxicological modeling—especially in aquatic science and PFAS impact analysis.
Its nimble size allows entry into both high‑stakes industrial sites and precise water‑resource modeling, making it a go‑to for regulatory and engineering challenges.
Despite its lean structure, GSI maintains satellite offices across the U.S. and serves clients on four continents, delivering local expertise with global reach.
Culture + Values
Exceptional client service
Technical and regulatory expertise
Ability to lead complex projects typical of larger firms
Flexible work environment with optional remote work
On‑the‑job training, mentorship, and professional development opportunities
Environment + Sustainability
Develops comprehensive GHG inventories covering Scope 1, 2, and 3 emissions following GHG Protocol and ISO 14064‑3 standards
Offers tailored decarbonization strategies and roadmaps with advanced modeling and cost–benefit analyses
Facilitates access to Renewable Energy Certificates and verified carbon offsets to support net‑zero ambitions
Supports clients in setting science‑based targets aligned with the Paris Agreement
Provides life‑cycle analyses and Environmental Product Declarations to quantify environmental impacts
Net‑zero target for operations not explicitly stated on public website
Inclusion & Diversity
No publicly available information regarding DEI strategy or gender statistics on website or LinkedIn