Process Modeling Engineer

About the role

Mariana Minerals is seeking a highly motivated Process Modeling Engineer to support the development of next-generation refining processes for critical minerals — key to enabling the world’s energy transition. In this role, you will develop, validate, and optimize heat and material balance models using tools such as ASPEN Plus/HYSYS, SysCAD, OLI Studio, or METSIM. You will work closely with R&D, pilot operations, and project execution teams to translate lab and pilot data into robust, scalable process models that drive the design of first-of-a-kind mineral refining facilities.

Responsibilities

• Develop steady-state and dynamic process models to establish heat and material balances for integrated mineral refinery systems using ASPEN, SysCAD, OLI, or METSIM.
• Automate equipment and process sizing (reactors, heat exchangers, filters, crystallizers, evaporators, and separators) based on model outputs, linking models to datasheets and other engineering tools.
• Develop and maintain process simulation databases, ensuring consistency and traceability between modeling assumptions, test data, and engineering deliverables.
• Calibrate and reconcile models using pilot or plant operating data to ensure model fidelity and predictive accuracy.
• Conduct process optimization studies — evaluating energy/heat recovery, recycle strategies, and material efficiency improvements.
• Develop dynamic process models to validate PLC and DCS programming and evaluate/optimize buffer sizing throughout the design.
• Link process models to CAPEX and OPEX estimation tools, automating techno-economic model development.
• Document modeling methodologies and results, providing clear technical communication for design reviews, techno-economic assessments, and regulatory submissions.

Requirements

• Bachelor's degree or higher in Chemical Engineering, Mechanical Engineering, Process Engineering, Metallurgical Engineering, or a closely related engineering discipline.
• Proficiency in one or more of the following process simulation tools: ASPEN Plus / HYSYS, SysCAD, OLI Studio / OLI Flowsheet, METSIM.
• Deep understanding of mass transfer, heat transfer, thermodynamics, fluid flow, and reaction engineering.
• Experience developing material and energy balances for multi-step, integrated process systems.
• Strong grasp of chemical equilibria and phase behavior in aqueous and non-aqueous systems.
• Familiarity with data reconciliation, parameter fitting, and model validation using experimental or operational data.
• Competency with Python or MATLAB for model automation, data processing, and custom calculations is a strong plus.
• Experience integrating process modeling outputs into EPC deliverables (PFDs, P&IDs, equipment datasheets, control narratives, etc.).

About Us

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

Our culture is built on three principles:

• Extreme Ownership – We take full responsibility for outcomes, relentlessly driving toward solutions.
• Engineer Out Requirements, then Automate – We simplify, optimize, and then automate for scale.
• Share Your Legos – We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Pay

Compensation Range: $100K - $160K