David Sierra Email & Phone Number

Houston, Tx, Us

• Communicating with internal stakeholders on strategy, policies/procedures, guidelines, and processes as it relates to procurement matters. • Driving the collaboration efforts with business and functional leadership in establishing and executing the procurement and project execution strategies. • Vendor selection and prequalification• Complete bidding cycle for small/medium/large projects• Contract management using Oxy’s ERP Ariba/SAP system• Acting as central point of contact between business unit proponents, vendor representatives, and other key stakeholders including HR and Legal.• Invoicing support and troubleshooting on assigned contracts/PO’s• In coordination with AP and Proponent make sure invoicing and payment activities are completed as per the agreements.• Monitor assigned contracts to ensure suppliers comply with the terms and conditions. • Participate in Supplier Performance Meetings

Houston, Texas, Us

• Responsible for the coordination, schedule, scope management and completion of projects. • Run budget for engineering, capital procurement and fabrication scope of the project. • Help develop purchasing reports within ERP system (Syteline) to better forecast deliveries and potential delays.• Align procurement activities with project timelines. Lead timely resolution of escalated supplier issues. • Run and analyze material status reports and communicate risks and problem areas to management.• Monitor engineering, drafting, purchasing and production to complete specific milestones.• Interface with external customers as well as top management throughout project life cycle. Handle warranty claims, back-charges, and liquidated damages.• Manages multiple projects simultaneously.

Amsterdam, Nl

• Implemented supply chain global strategies for procurement of materials and project equipment for multiple large packages. Defined key milestones, logistic strategies and key performance indicators (KPIs) for packages. • Negotiated complex EPC contracts with suppliers globally to ensure acceptance of terms and conditions including compliance with global, regional and local regulations. Evaluated external markets for competitive sources of supply.• Set-up project by defining project gates, collecting lessons learned, multi-disciplinary input, and benchmarking.• Provided support to project buyers, category manager and project proposals determining the correct strategy around procurement and management of logistics services.• Initiated RFI / RFQ, analyzed bids, negotiated for best and final offer, prepared bid tabulation and processed approval of bid tabulation before issue of purchase orders. • Worked with cross-functional team to lead supplier qualification status and performance.• Negotiated commercial terms and pricing for upcoming tenders that resulted on savings of around $12M.

Houston, Tx, Us

• Defined and implement sourcing strategies via market research, procuring materials and services, and oversee logistics and on-time delivery for various commodity categories. • Managed the efficient and effective material control of equipment and subcontracts for multiple projects, from planning through sourcing, expediting, inspection, transport, and receipt.• Negotiated sourcing agreements for operational equipment materials, including raw materials, piping, valves, instruments and fittings. • Identified and screened potential suppliers both domestic and internationally.• Leveraged global quantities, capitalized on global manufacturing efficiencies, and implemented risk mitigation.• Determined customer needs and identified materials that met project’s technical and commercial requirements.

• Oversaw all purchases for operations activities for customers in the oil and gas, mining and construction industries primarily based in Latin America. Manage Purchase Orders to domestic and international suppliers.• Monitored levels of inventory and demand to ensure timely stock orders are placed onto suppliers. • Evaluated and select suppliers to reduce risk and maximize overall value. • Negotiated pricing, contracts and terms with vendors and suppliers.

Houston, Tx, Us

• Led the department for produced water, seawater and wastewater process systems. • Managed a team of 10 project managers and coordinators, overseeing engineering, proposals, project control, fabrication, purchasing and logistics for the department’s multiple projects.• Identified and evaluated potential suppliers. Negotiated sourcing agreements and identified potential risks. • Worked with fabrication vendors and suppliers to capture product demand and create optimal production schedules. Saved cost by improving efficiencies and reducing non-value added activities.• Managed Inventory control, material planning, & SAP material control for product line inventory parts.• Championed business transformation team for new ERP system implementation– SAP- Project Optimus.

Houston, Tx, Us

• Managed the execution of multiple EPC projects simultaneously. • Coordinated engineering, procurement, cost control, fabrication and logistics throughout project’s life cycle. • Developed project scope, budgets, work plans, project procurement strategies, transportation logistics and schedules. Ensured that project estimating, cost management, invoicing, and scheduling were executed in a timely fashion.• Managed multiple EPC cross-functional projects for major international companies.• Identified new suppliers. Negotiated contracts with vendors and fabricators both inside and outside USA. • Developed and maintained relationships with equipment suppliers and customers. • Provided leadership for project team by building and motivating team members to meet project goals• Ensured effective quality assurance. Provided regular status updates and presentations to management.

Master Of Business Administration (Mba), Finance And International Business

Civil Engineer, Structural Engineering