This job posting is seeking a Senior Billing Specialist for a technology services company in Portland. The ideal candidate will have excellent customer service skills, be able to multi-task and prioritize tasks under tight deadlines. Responsibilities include performing data reconciliation from multiple systems, invoicing customers accurately and in a timely manner, verifying timesheet information, auditing data discrepancies, and working with sales to resolve issues. Requirements include over 2 years of customer service experience, advanced Excel skills, experience with high-volume billing, and the ability to work well in a fast-paced team environment.