William Calderon
Charlotte,NC
Summary
I am an Army Veteran with more than 7 years of service. My current position is an Estimating and Purchasing Manager for Slate Building Group. I have a Master's degree in Public Administration and Bachelor's degree is in Business Management with a concentration in Sales and Marketing. With my strong leadership skills, management expertise, critical thinking and strong communication, I'm able to adapt and overcome any obstacles to provide a positive outcome.
Overview
15
15
years of professional experience
Work History
Estimating and Purchasing Manager
Slate Building Group
Cornelius, NC
04.2025 - Current
- Sourced and onboarded high-performing trade partners by evaluating pricing, quality, and efficiency, resulting in faster build times and improved craftsmanship.
- Developed a streamlined pricing update system integrated with accounting and estimating platforms, boosting cost accuracy and operational alignment.
- Launched a company-wide rebate program by partnering with manufacturers and suppliers, generating new revenue streams and improving material cost recovery.
- Collaborated with Construction Managers and designers to resolve field discrepancies and plan clarity issues, reducing change orders and construction delays.
- Provided takeoffs for framing, block, and brick foundations while coordinating vendor estimates for all other scopes to maintain bid efficiency.
- Executed bulk purchasing and strategic sourcing initiatives that reduced material costs and mitigated supply chain disruptions.
Sourcing Specialist (PH)
The Walt Disney Company
Orlando, FL
03.2024 - 04.2025
- Participated and lead cross-functional sourcing projects with key internal collaborators within Corporate
- Evaluated suppliers and consultants regarding design, construction, and services
- Generated and analyzed historical data to provide a baseline to support savings and cost avoidance
- Led RFI/RFP's process for construction and professional services following The Walt Disney Company policy and procedures
- Analyzed bids based on total cost/supply to identify opportunities to achieve an efficient value
- Prepared and completed clear, structured negotiation strategies applying Strategic Sourcing methodology
- Prepared and executed over 120 contracts as well as perform post-award administration surpassing $20 million dollars
- Ensure compliance with Sourcing and Procurement policies and standard methodologies
- Analyze market industry trends and conditions that affect internal collaborators and external suppliers and/or pricing
- Utilization of Coupa software, Per Angusta software, DocuSign, DnB, SAP and Microsoft Office to conduct business in this role
- Advocate the utilization of diverse suppliers as per Disney's WMVBE policy
- Created and implemented a bid summary template utilized in the bid analysis phase
Estimator
Mungo Homes
Irmo, SC
03.2023 - 03.2024
- Performs material and labor take-offs/ estimates for all series, plans, options in residential construction spanning over 9 markets in 4 states
- Review reports, PO's, VPO's related to estimated cost codes and troubleshoot as needed
- Implemented a corporate estimating SOP and multiple operational templates to decrease lead times in conducting business and to train other team members in these processes and procedures
- Creating and reviewing cost analysis of existing product, new product and product changes to enhance corporate communication
- Conduct company wide lumber bidding (negotiating), cost input and analysis to ensure maximum profit margins and less lead times to maintain and improve annual revenue
- Utilization of KOVA software, AutoCAD, Smart sheet and Microsoft Office to conduct daily business in this role
- Meets weekly, quarterly, and annual deadlines for special projects and assignments
Purchasing Project Coordinator
Mungo Homes
Irmo, SC
05.2022 - 03.2023
- Collaborated with internal teams to develop project solutions resulting in on-time execution
- Confirm appropriate margins are set for all corporate controlled functions and cost code programming
- Ensure that option restriction/inclusion is set up properly per market
- Setting up new plans and communities in KOVA purchasing software
- Ensure all procured items/ materials are with up to date vendors and minimize supply chain issues
- Ensure all scopes of work are up to date from corporate for pre existing, new, and future communities
- Residential construction estimating utilizing AutoCAD software to perform material and labor take-off estimates for all series, plans, and options
- Conducts corporate wide lumber bidding, cost input, and analysis
Contract Specialist, GS
SCARNG USPFO
Columbia, SC
01.2022 - 05.2022
- Review financial and budget information to ensure that purchase request and contracts may be awarded without any discrepancy
- Responds to customer needs to procure repetitive items or services for which specifications have become standardized and where established competitive markets and price competition exists
- For compliance with performance standards, applicable laws, delivery schedules, payment provisions, inspections, progress reports, and other requirements stated in the contract
Financial Technician, GS
UNITED STATES DEPARTMENT OF DEFENSE
Columbia, SC
02.2019 - 01.2022
- Process, review, and audit a wide variety of standard pay actions which establish, maintain, adjust or close pay accounts to adequately compensate service members, active or retired
- Proficient in Microsoft office to process daily, monthly, quarterly, and annual reports to ensure over 99% success
- Reviews source, substantiating and supporting pay authorization documents to ensure completeness, propriety, authentication, accuracy, and compliance with applicable regulations, policies and precedents
- Enters pay transactions into the organization's automated pay system and also has disbursed over $15.5 million worth of payments with no errors
Outside Sales Representative
FASTENAL COMPANY
Columbia, SC
01.2018 - 01.2019
- Managing a book of business of more than 190 accounts that range from Government, National, and Local contracts, while coding any necessary information needed for each account on multiple systems
- Perform comprehensive market research on products and businesses
- Provide exceptional product and service knowledge for excellent quality customer service
- Exceptional negotiation skills followed by experience in procurement
- Superior multitasking skills, administrative skills, and leadership skills able to handle any type of situation
Sales Associate
FASTENAL COMPANY
Columbia, SC
05.2017 - 01.2018
- Establish, develop and maintain positive business and customer relationships
- Present, promote, and sell products/ services using solid arguments to existing and prospective customers
- Superior customer service, cash handling with no errors, and multitasking skills
- Performed cost-benefit and needs analysis of existing/ potential customers to meet their needs
Operations Management Supervisor
UNITED STATES ARMY
Hohenfels
03.2014 - 05.2017
- Developed and led training programs in operations and risk management for a company and battalion sized element
- Translated business needs and priorities into actionable logistics strategies
- Maintenance checks/ services and quality assurance to comply with OSHA regulations
- Assumed ownership over team productivity and managed work flow to meet or exceed quality service goals
- Analyzed key aspects of the business to evaluate the factors driving results and summarized results into presentations
- Analyzed budgets, financial reports and projections for accurate reporting of financial standing
Maintenance Coordinator
UNITED STATES ARMY
Fort Lewis, WA
09.2010 - 03.2014
- Partnered successfully with additional Military allies to produce successful training and maintenance management operations
- Implemented innovative programs to maximize daily business from stateside and deployments
- Uphold top-quality workmanship and excellent customer service
- Conducted routine and scheduled maintenance services and communicated effectively with customers to prevent future problems
Education
Master's degree - Public Administration
South University
Columbia, SC03.2020
Bachelor's degree - Business Management
DeVry University
Pomona, CA09.2018
Skills
- Leadership
- Purchasing
- Cost analysis
- Contract Negotiation
- Estimating
- Strategic Sourcing
- Detail Oriented
- Supplier Evaluation
Personal Information
Work Permit: Authorized to work in the US for any employer
Timeline
Estimating and Purchasing Manager
Slate Building Group
04.2025 - Current
Sourcing Specialist (PH)
The Walt Disney Company
03.2024 - 04.2025
Estimator
Mungo Homes
03.2023 - 03.2024
Purchasing Project Coordinator
Mungo Homes
05.2022 - 03.2023
Contract Specialist, GS
SCARNG USPFO
01.2022 - 05.2022
Financial Technician, GS
UNITED STATES DEPARTMENT OF DEFENSE
02.2019 - 01.2022
Outside Sales Representative
FASTENAL COMPANY
01.2018 - 01.2019
Sales Associate
FASTENAL COMPANY
05.2017 - 01.2018
Operations Management Supervisor
UNITED STATES ARMY
03.2014 - 05.2017
Maintenance Coordinator
UNITED STATES ARMY
09.2010 - 03.2014
Master's degree - Public Administration
South University
Bachelor's degree - Business Management
DeVry University
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