Westlake Chemical · Houston, Texas, US

Senior Demand Planner

OpenFull-timePay not stated

Open — Westlake Chemical has a posting for this job. Posted 11 Nov 2026.

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Posted 11 Nov 2026 · Full-time · Pay not stated

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About this job

Westlake offers you the potential to enrich your work life and career experience in an entrepreneurial environment. We work together to enhance peoples' lives through our products and presence in the communities in which we operate.​

Westlake Pipe & Fittings, a Westlake division (NYSE:WLK), is one of the largest polyvinyl chloride pipe and fittings manufacturer in North America. With 23 manufacturing and distribution locations, the company supplies gasketed, solvent weld and restrained joint pipes and a wide range of fittings for a diverse list of markets including municipal water and sewer, plumbing, water well, pool and spa, and agricultural and turf irrigation. Westlake Pipe & Fittings is an industry leader in product development with Certa-Lok® spline-lock technology and product systems that are focused on building A Better Foundation. To learn more, visit the website at WestlakePipe.com and follow us on LinkedIn and Facebook.

SUMMARY

Oversees the forecasting and demand planning activities for the Sales Inventory and Operations Planning (SIOP) process. Responsible for developing, managing and driving consensus around the demand plan. Reports to the SIOP Manager and works cross-functionally to support the overall operations planning and control process.

DUTIES AND RESPONSIBILITIES

May include, but are not limited to, the following:

  • Responsible for the development and communication of the demand plan through the monthly SIOP process through collaboration with the sales, marketing, product management teams.
  • Develop and maintain relationships with key stakeholders across the organization to ensure buy-in and alignment on the demand plan
  • Responsible for communicating the monthly demand plan to all business functional areas through the SIOP process
  • Executes all quantitative and qualitative forecasting activities resulting in the demand plan
  • Creates statistical forecast through different quantitative methods at various levels of aggregation for comparison and to determine best-fit forecasting model
  • Works cross-functionally to resolve demand and supply prioritization in a constrained environment
  • Maintains and enhances the demand dashboard for data visualization and assumptions gathering during the demand review meetings
  • Standardizes demand planning activities and data analytics to support the SIOP process
  • Implements and tracks forecast error metrics to determine if adjustments are needed to both the quantitative or qualitative inputs, or overall forecasting methodology
  • Coordinates all demand planning activities to support the annual budget process resulting in the annual business plan
  • Supports the design, implementation and enhancement of the Company’s planning system solution as part of the supply chain digital strategy
  • Utilizes change management methodologies to drive organizational change

EDUCATION, EXPERIENCE AND QUALIFICATIONS

  • Bachelor’s degree in Supply Chain or related field
  • 5+ years of supply chain and/or demand management experience
  • Demonstrated analytical skills with ability to develop concepts and actionable plan
  • Proficient computer skills in MS Excel, Word, Outlook, Power BI
  • Proficient with MRP experience required
  • ASCM/APICS certification is preferred
  • Experience with ERP Systems with SAP S/4HANA preferred
  • Experience with SIOP/IBP software platforms (Arkieva, John Galt, Kinaxis) preferred
  • Able to multi-task and display a high level of company/team spirit in a fast-paced environment
  • Demonstrated excellent interpersonal and communication skills, both written and verbal
  • Be able to travel to sites as needed (up to 25% travel)

PHYSICAL DEMANDS

While performing the duties of this job, the employee is frequently required to sit; stand; walk; use hands to touch, handle, or feel; reach with hands and arms; and talk or hear. The employee is occasionally required to stoop, kneel, or crouch. The employee must regularly lift and/or move up to 10 pounds, frequently lift and/or move up to 25 pounds, and occasionally lift and/or move up to 50 pounds. Specific vision abilities required by this job include close vision, distance vision, color vision, peripheral vision, depth perception, and ability to adjust focus.

WORK ENVIRONMENT

The noise level in the work environment is usually moderate as normally based in an office. Some of the work may be required in the operating units which can require usage of required PPE including safety glasses, hearing protection, etc. May also result in exposure to outside elements and may require usage of stairs and elevators. Travel including air travel or auto travel may occasionally be required.

Westlake is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to any characteristics protected by applicable legislation.

If you are an active Westlake employee (or an employee of any Westlake affiliates), please do not apply here. You will apply via the Jobs Hub application in Workday.

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What do Logistics & Supply Chain jobs in Texas pay?

Talentify has no pay figure for this posting. The lines below are about Logistics & Supply Chain jobs on Talentify in Texas as a group, computed by Talentify's job index across their postings. They are not the pay for this job.

Of the 694 Logistics & Supply Chain jobs on Talentify in Texas, 93 list pay per hour.

Taking the midpoint of each listed range, the middle half pay 18.31–25.58 USD per hour and the median is 21.00 USD per hour.

84 of these 93 name no currency; they are counted as USD because the jobs are in the United States.

Pay as employers listed it, not adjusted or verified. Updated 2026-11-14.

Computed on 2026-11-14 from the pay in 93 listings.

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