HRIS Manager II

Trinseo is a different kind of global materials company – at the intersection of people, technology, and customers. We are a world leader in the production of plastics and latex binders. Our culture is built on passion and innovation. A career at Trinseo presents a unique opportunity to work in a highly collaborative environment. Helping customers solve their most complex material challenges is the reason we come to work each day. We are seeking innovative thinkers – ready to tackle any challenge and passionate about delivering value. As a global materials solutions provider focused on delivering innovative and sustainable solutions to our customers, we need people to feel respected and included so they can be more creative, innovative, and successful. We strive to create workplaces that reflect all communities and customers we serve and where everyone feels empowered to bring their full, authentic selves to work. That's why we're fully committed to inclusion across race, gender, age, religion, identity, and experience to drive us forward every day.

Role Overview

This role serves as a subject matter expert across multiple Workday modules and plays a critical leadership role in the design, delivery, and long-term optimization of Workday solutions. The individual will lead large-scale system initiatives, independently manage complex projects, and partner closely with HR, IT, Finance, Payroll, and external vendors to ensure Workday effectively supports enterprise-wide business objectives.  This position requires strong systems thinking, the ability to translate business strategy into scalable system solutions, and confidence operating with minimal oversight in a fast-paced, evolving environment.

Workday Strategy & System Ownership

• Serve as a senior subject matter expert across core Workday modules (e.g., HCM, Core Compensation, Absence, Time Tracking, Payroll, Talent, Benefits, Reporting.
• Own and drive Workday configuration strategy to ensure scalability, data integrity, and alignment with business and HR operating models.
• Act as a trusted advisor to HR and business leaders on Workday capabilities, design trade-offs, and best practices.
• Proactively identify opportunities to improve system efficiency, user experience, automation, and reporting.

Project & Program Leadership

• Lead and independently manage large-scale, cross-functional Workday initiatives such as module implementations, major redesigns, global rollouts, or regulatory-driven changes.
• Develop and manage project plans, timelines, risks, dependencies, and stakeholder communications.
• Coordinate closely with internal teams and external partners (e.g., implementation vendors, AMS providers).
• Ensure projects are delivered on time, within scope, and with high-quality outcomes

Configuration, Testing & Deployment

• Design and execute complex configuration changes, testing strategies, and deployment plans.
• Lead end-to-end testing efforts, including unit, integration, UAT, and parallel testing as applicable.
• Ensure appropriate documentation, audit trails, and controls are maintained.
• Support change management and adoption activities in partnership with HR and business stakeholders.

Reporting, Data & Governance

• Provide expertise in Workday reporting (custom reports, dashboards, calculated fields, BIRT if applicable).
• Ensure data accuracy, consistency, and governance across modules and business processes.
• Partner with HR, Finance, and Compliance teams to support regulatory, audit, and data privacy requirements.

Process Design & Advisory

• Partner with HR to analyze and redesign HR business processes with a systems-first mindset.
• Translate complex business requirements into practical, scalable Workday solutions.
• Challenge existing processes when appropriate and advocate for standardization and best practices.

Support, Mentorship & Leadership

• Serve as an escalation point for complex system issues.
• Mentor and guide junior analysts or administrators, providing functional and technical leadership.
• Establish and maintain system documentation, standards, and operating procedures.

Minimum Education Required: BS/BA degree 

Minimum Experience: 10-15 years system experience, 5-10 year Workday experience 

Knowledge, Skills & Abilities: Workday system configuration, project management, compliance, global HR business processes, testing/process documentation 

Equity And Inclusion With our expanding global presence, cross-cultural insight and competence are essential for our ongoing success. We believe that a diverse workforce contributes different perspectives and creative ideas that enable us to continue to improve every day. Race, gender, ethnicity, country of origin, age, personal style, sexual orientation, physical ability, religion, life experiences and many more factors contribute to this diversity.