Refinery Scheduler

About Aster 

Aster Chemicals and Energy (Aster) is a leading provider of chemical and energy solutions in Singapore and Southeast Asia. Aster is a joint venture led by Chandra Asri in partnership with Glencore Group. Building on the foundations of Singapore’s first oil refinery, our facilities on Pulau Bukom and Jurong Island serve as the nation’s hub for integrated refining and petrochemical production. Aster Bukom operates a 237,000 barrels per day refinery and a 1.1 million tonne per year ethylene cracker, while Aster Jurong Island produces essential petrochemicals that support industries across the region. 

With over 60 years of heritage, Aster is shaping the future by driving progress and creating new opportunities for our people.  From advancing energy solutions to driving petrochemical innovation, we welcome you to join us in our journey that reflects our commitment to sustainability and operational excellence in an evolving industry landscape. 

Together, we can achieve more — come be a part of it. 

About the job

Job Descriptions:

1. Integrated Refinery & ECC Scheduling

• Develop, optimise and execute the refinery and Ethylene Cracker Complex (ECC) schedule in alignment with the Economist, Economist and Scheduling (E&S) team and operational requirements.
• Perform Production Unit (PU) scheduling using AspenTech Orion and provide clear unit steers, guidelines and issue escalation.
• Optimise product blending, ensuring commitments, quality specifications and stock targets are met.
• Ensure day-to-day blend matrices and Oil Movements instructions comply with the overall Production Plan.
• Monitor schedule adherence, track execution progress and perform timely rescheduling when required.

2. Logistics, Movements & Stock Coordination

• Schedule jetties and pipeline transfers for crude and product loading/discharge in accordance with nominations and operational readiness.
• Ensure timely product availability while minimising delays, demurrage exposure, interface losses and suboptimal logistics utilisation.
• Collaborate closely with Supply & Distribution and Oil Movements to maintain smooth coordination of shipments and internal transfers.

3. Schedule Quality, Analysis & Continuous Improvement

• Maintain a high-quality schedule that reflects real operational constraints, dependencies, and resource considerations.
• Conduct daily analysis of deviations between scheduled plans and actual performance; drive corrective actions with accountable parties.
• Support mass-balance integrity and data accuracy with Finance and Economist Model Coordinator (EMC).
• Maintain strong discipline in schedule updates, data quality and system traceability.
• Identify opportunities to improve blending efficiency, logistics utilisation and unit stability through enhanced scheduling practices.

4. Operational Alignment & Issue Management

• Coordinate adjustments to mitigate unplanned disruptions while preserving safe and stable operations.
• Ensure schedule changes are timely, clear and well-communicated across relevant stakeholders.
• Contribute to refinery readiness during planned maintenance periods by ensuring accurate forward planning and product availability.

5. Stakeholder Collaboration

• Work cross-functionally with Operations, Product Quality, Oil Movements, Maintenance, EMC, S&D and other manufacturing teams.
• Facilitate alignment on constraints, priorities, stock positions and quality requirements.
• Influence decision-making by presenting clear schedule insights, risks and value optimisation opportunities.

Job Requirements:

• Degree in Chemical Engineering preferred; other relevant engineering disciplines may be considered.
• Minimum 5 years of experience in refinery operations, production planning, product quality, supply & distribution or oil movements.
• Strong numerical, analytical and problem-solving capability with high technical aptitude.
• Strong schedule discipline, attention to detail and a solid data-integrity mindset.
• Ability to manage operational constraints, competing priorities and incomplete information in a fast-paced environment.
• Good understanding of refinery processes, blending, logistics, stock management and scheduling fundamentals.
• Skilled in cross-functional coordination, conflict resolution, communication and influencing at all levels.
• Experience with scheduling or planning systems (e.g., AspenTech Orion or equivalent tools) is an advantage.
• Demonstrated ability to maintain schedule stability, ensure alignment with stakeholders and respond effectively to operational changes. 

We thank you for your interest. Kindly note that only shortlisted candidates will be contacted for a discussion.