About The Position

World Fuel is seeking a detail-oriented and highly organized Senior Billing Specialist to support billing operations for a strategic international customer under the NATO Support and Procurement Agency (NSPA) services program. The position serves as the primary billing subject matter expert, managing complex customer invoicing processes, validating supporting documentation, resolving billing discrepancies, and ensuring timely and accurate invoicing across global transactions. The role manages end-to-end billing operations, prepares invoice packages, applies customer-specific billing requirements, validates pricing and billing accuracy, resolves discrepancies and disputes, and supports quality and process excellence. It involves collaboration with commercial, finance, operations, and other internal stakeholders to obtain information, resolve issues, and deliver accurate invoices and supporting documentation. The position is based in Houston, Texas, with a hybrid work arrangement.

Requirements

  • At least 3 years of experience in billing, accounts receivable, finance operations, contract administration, or related areas.
  • Experience managing complex customer invoicing and billing processes.
  • Strong proficiency in Microsoft Excel, including data validation, formulas, and reporting.
  • Exceptional attention to detail and accuracy.
  • Strong analytical and problem-solving skills.
  • Ability to manage multiple priorities and meet deadlines in a fast-paced environment.
  • Excellent written and verbal communication skills.

Nice To Haves

  • Experience supporting contract-based or government-related billing environments.
  • Knowledge of accounts receivable and billing controls.
  • Experience managing credits, rebills, and dispute resolution processes.
  • Familiarity with ERP or financial systems such as SAP, Oracle, Workday, or similar platforms.
  • Experience supporting international customers or global billing operations.

Responsibilities

  • Serve as the primary billing specialist supporting NSPA services transactions.
  • Prepare, review, and process invoices in accordance with customer and contractual requirements; validate billing information and submit invoices accurately and on schedule.
  • Support timely customer billing, accounts receivable accuracy, and merchant payment processing.
  • Create complete customer invoice packages and review supporting documentation, approvals, and required signatures.
  • Coordinate with internal stakeholders to obtain missing information and ensure delivery tickets and supporting records are matched to invoices.
  • Conduct quality reviews of billing packages before customer submission.
  • Manage customer-specific invoice templates, billing files, documentation, recurring billing cycles, and reporting requirements.
  • Ensure invoice packages comply with customer submission guidelines and formats.
  • Apply approved pricing structures and billing rules; review invoices for accuracy and contract compliance.
  • Coordinate with commercial, finance, and operations teams to resolve pricing discrepancies and billing exceptions.
  • Investigate invoice issues, identify root causes, and process billing corrections, credits, and rebills as needed.
  • Maintain documentation for billing adjustments and ensure records remain accurate and audit-ready.
  • Research billing disputes and invoice inquiries; partner with internal stakeholders to resolve concerns and track open issues through completion.
  • Implement corrective actions and billing adjustments when required.
  • Perform detailed pre-submission reviews, maintain process controls and documentation standards, and help reduce errors, disputes, delays, and rework.
  • Escalate significant billing issues when appropriate.
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