Serena Castro

Detail-oriented individual with experience supporting Harris County Purchasing operations, including agenda-driven procurement coordination, requisition and purchase order processing, document review, vendor communication, record management, and compliance-focused administrative support. Proficient in Microsoft Office, Excel, STARS Financial & Supply System, OpenText, AIP, and Adobe PDF tools. Recognized for accuracy, organization, discretion, professionalism, and the ability to manage multiple time-sensitive priorities while working with internal departments, buyers, procurement managers, vendors, and government stakeholders.

Purchasing Court Management Coordinator - Harris County Purchasing Department - Houston, TX

(2024-05)

• Coordinate and prepare purchasing-related documents and administrative materials supporting agenda-driven procurement actions for Harris County Commissioners Court, the Harris County Juvenile Board, the Harris Health System Board of Trustees, and other governing bodies.
• Review, proofread, organize, and route procurement documents for completeness, accuracy, formatting, and timely submission to internal staff, agenda contacts, vendors, and governing-body support teams.
• Perform data entry and maintain current project and procurement records across multiple purchasing systems, tracking administrative processing steps and supporting timely movement of procurement items.
• Process and track project-related bond requests, insurance documents, and other supporting documentation required to advance procurement activities and maintain compliance with office requirements.
• Communicate project- and agenda-related information with vendors and distribute agenda items and supporting materials as needed to maintain deadlines and procurement workflow continuity.
• Provide day-to-day administrative coordination to buyers and procurement managers, including cross-coverage for other Court Coordinators and completion of delegated assignments.
• Support procurement operations through requisition review, purchase order processing and closure, bid monitoring, invoice processing, supplier onboarding, and maintenance of financial and administrative tracking records.
• Use STARS Financial & Supply System, Excel, OpenText, AIP, Microsoft Office, and Adobe PDF tools to prepare, route, track, and maintain accurate procurement documentation.
• Maintain confidentiality of court, vendor, financial, and procurement information while exercising sound judgment and supporting compliance with Harris County policies and procedures.

Unit Secretary - Baylor St. Luke's Medical Center - Houston, TX

(2023-03 - 2024-04)

• Provided high-volume administrative support within a medical unit, maintaining accurate records, coordinating communications, and supporting daily operations.
• Managed patient records, scheduling, phone calls, admissions, discharges, and electronic health record updates with accuracy and confidentiality.
• Coordinated communication among healthcare teams and patients while maintaining professionalism, organization, and compassionate customer service.

Lead Cashier - Houston Methodist Hospital - Houston, TX

(2020-08 - 2023-03)

• Managed daily cash-handling operations, processed payments accurately, and maintained proper financial transaction records with minimal supervision.
• Operated the Starbucks service area while maintaining product, cleanliness, organization, and customer-service standards.
• Trained and mentored junior staff and supported efficient daily operations through strong organization, communication, and attention to detail.

Host / Waitress / Customer Service Representative - Star Pizza 1 & 2 - Houston, TX

(2017-05 - 2019-12)

• Provided professional customer service across front-of-house and phone responsibilities in a high-volume environment.
• Coordinated seating and reservations, processed accurate orders, resolved customer concerns, and maintained a positive experience during busy service periods.
• Demonstrated adaptability, communication, teamwork, and problem-solving while performing multiple roles.

Sam Houston High School (2017)