Lizeth Velasco Serna

Billing, Procurement, and Operations Specialist with experience coordinating invoices, payments, inventory, and material acquisitions for domestic and international operations. I believe in building strong, lasting relationships with clients and vendors while maintaining meticulous control of processes and documentation. My proactive and detail-oriented approach ensures smooth operations and compliance, aligning with organizations that value efficiency, accuracy, and continuous improvement.

Financial Operations Assistant | Accounts Management at OCIN Interpretation Services (2024-04 – 2025-03)

• Managed high-volume email correspondence with internal staff, management, and external clients.
• Supported accounting department projects as requested.
• Processed payments for interpreters and vendors, verifying rates and working hours before check release and resolving inquiries via email and phone.
• Created manual and customized statement invoices for clients across multiple business units.
• Monitored billing accuracy for multiple clients, identifying and correcting discrepancies in multi-client portals and accounting systems.

English Instructor | Youth Education at PRONI (National English Program) (2023-08 – 2023-12)

• Delivered English lessons to children aged 7–12.
• Developed lesson plans and teaching materials aligned with program objectives.
• Facilitated classroom management and student assessment.

Purchasing Coordinator | Supply Chain Operations at Koos Mexico (2022-08 – 2023-08)

• Supported national and international purchasing processes, maintaining accurate purchase records and coordinating with accounting.
• Released customs packages for multiple shipments.
• Reviewed invoices, performing comparison and validation before submission to accounting.
• Analyzed supplier costings (make vs. buy) and contributed to purchasing plans.
• Executed purchase orders and reconciled inventory with contractual commitments.

Textile Production Specialist | Order and Inventory Control at Koos Mexico (2018-03 – 2021-12)

• Received and monitored thread inventory according to production requirements.
• Scheduled and tracked manufacturing orders.
• Controlled greige fabric inventory for production areas.
• Transferred fabric rolls to sewing areas and prepared shipments.
• Prepared finished fabric data for cutting and sewing control.
• Monitored client performance and provided regular updates.

Junior Accounting Specialist | Vendor and Employee Payments at Ober Gatlinburg Inc. (2017-01 – 2018-01)

• Collaborated on daily revenue and sales reports.
• Supported accounting cashiers and performed cashier duties as needed.
• Closed cash registers and verified end-of-day balances.
• Reviewed and processed vendor invoices accurately and timely.
• Prepared weekly and monthly payments via checks, ACH, and wire transfers.
• Communicated with vendors regarding billing inquiries, payment status, and discrepancies.

Master's Degree in Finance – Universidad Cuauhtemoc Ags (2022 – 2024)

Bachelor's Degree in Administration – Universidad Tecnologica de Calvillo (2015 – 2017)

Advanced Technician in Human Resources – Universidad Tecnológica del Norte de Aguascalientes (2010 – 2012)