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Hysys Jobs (NOW HIRING)

System One

System Design Engineer, EM Pump

Bellevue, WA · Remote

$69 - $115/hr

Support EM Pump integration into the Processing System steady state and transient thermohydraulic model in Aspen HYSYS Plus. * Complete or support analyses, such as thermal, seismic, structural, pipe ...

Polaris Engineering

Senior Process Engineer

Lake Charles, LA · On-site

$95K - $123K/yr

Extensive Process Simulation experience (HYSYS, UNISYS preferred) * P. E. license preferred * Available for short-term travel IV. REPORTING REQUIREMENTS: Reports to the Process Department Engineer ...

Nucor

Process Engineer

Convent, LA · On-site

Develop digital twin models of Tenova HYL technology for Direct Reduction Iron (DRI) making processes utilizing Aspen Plus, Aspen HYSYS, and ProMax. Optimize oxygen injection lances for the partial ...

New

CANUSA EPC LLC

Process Engineer Lead - Oil & Gas

Denver, CO · On-site

$106K - $138K/yr

Build and review process simulation models using BRE ProMax, AspenTech HYSYS, or similar software. * Perform and review equipment, piping, valve, and PSV sizing calculations. * Support relief system ...

Posted today

Protingent

System Design Engineer, EM Pump

Bellevue, WA · On-site

$69 - $115/hr

Support EM Pump integration into the Processing System steady state and transient thermohydraulic model in Aspen HYSYS Plus. * Complete or support analyses, such as thermal, seismic, structural, pipe ...

Nucor

Process Engineer

Convent, LA

Develop digital twin models of Tenova HYL technology for Direct Reduction Iron (DRI) making processes utilizing Aspen Plus, Aspen HYSYS, and ProMax. Optimize oxygen injection lances for the partial ...

New

CANUSA EPC LLC

Intermediate Process Engineer

Denver, CO · On-site

$35 - $60/hr

Build new and update existing process simulation models using tools such as BRE ProMax and AspenTech HYSYS. * Develop and review Process Flow Diagrams (PFDs), Heat & Material Balances (HMBs), and ...

Posted today

Polaris

Senior Process Engineer

Lake Charles, LA · On-site

$95K - $123K/yr

Extensive Process Simulation experience (HYSYS, UNISYS preferred) * P. E. license preferred * Available for short-term travel IV. REPORTING REQUIREMENTS: Reports to the Process Department Engineer ...

System One

System Design Engineer, EM Pump

Bellevue, WA · Remote

$69 - $115/hr

Support EM Pump integration into the Processing System steady state and transient thermohydraulic model in Aspen HYSYS Plus. * Complete or support analyses, such as thermal, seismic, structural, pipe ...

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How much do hysys jobs pay per hour?

As of Aug 21, 2026, the average hourly pay for hysys in the United States is $25.47, according to ZipRecruiter salary data. Most workers in this role earn between $17.55 and $29.57 per hour, depending on experience, location, and employer.

What is a HYSYS?

A Hysys job typically involves using Aspen Hysys, a process simulation software, to model and optimize chemical processes in industries such as oil and gas, refining, and petrochemicals. Professionals in this role analyze process performance, design equipment, and troubleshoot operational issues. They may work as process engineers, simulation specialists, or consultants to improve efficiency and safety in industrial operations. Strong knowledge of thermodynamics, process design, and simulation techniques is essential for success in this field.

What does a HYSYS do?

Professionals in a HYSYS-focused position generally spend their days developing and optimizing process simulations using Aspen HYSYS software, analyzing plant data, and working closely with process engineers to troubleshoot operational challenges. They may also participate in project meetings, prepare technical reports, and present simulation results to both engineering and management teams. Collaboration is frequent, as HYSYS specialists often consult cross-functional groups, including operations, safety, and instrumentation teams, to ensure simulation outputs align with real-world requirements. Continuous learning is important, as new software updates and evolving industry standards require ongoing professional development.

What are the key skills and qualifications needed to thrive in the HYSYS position?

To thrive in a HYSYS role, you need a solid background in chemical engineering principles and process modeling, typically supported by a degree in chemical engineering or a related field. Proficiency with Aspen HYSYS process simulation software is essential, and additional certifications in process simulation may be advantageous. Strong analytical thinking, attention to detail, and effective communication skills set top performers apart. These skills and qualifications are crucial for accurately modeling chemical processes, troubleshooting design issues, and collaborating with multidisciplinary teams to ensure optimal plant performance.

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Hysys jobs near you
Infographic showing various Hysys job openings in the United States as of August 2026, with employment types broken down into 97% Full Time, and 3% Contract. Highlights an 94% Physical, 2% Hybrid, and 4% Remote job distribution, with an average salary of $52,986 per year, or $25.5 per hour.

Senior Process Engineer

Nikkiso Cryogenic Industries

Huntington Beach, CA • On-site

$108K - $140K/yr

Full-time

Re-posted 15 days ago

Job description

Company Overview
Nikkiso Clean Energy & Industrial Gases is a leading provider of cryogenic pumps, heat exchangers, process systems, services, and solutions for the LNG and industrial gases industry. We are a subsidiary of Nikkiso Company Ltd, a leading industrial manufacturer headquartered in Tokyo, Japan, with over $1.5 B in annual revenue, 8000 + employees worldwide, and publicly traded on the Tokyo Stock Exchange.
Job Overview
The Senior Process Engineer leads process system design and technical definition for skid-mounted and modular process packages in an EPC execution environment. This role is responsible for developing and validating the process design basis, ensuring system operability, and integrating process requirements across mechanical, I&C, and package design.
A core responsibility of this role is ownership of process simulation models, ensuring that simulation results are accurate, validated, and fully aligned with design deliverables, vendor data, and operating philosophy.
The position requires strong experience in oil & gas, LNG, cryogenic, or industrial gas systems, with the ability to translate simulation outputs into practical, fabrication-ready engineering solutions.
Responsibilities
Process Design & System Definition
  • Develop and lead:
    • Process Design Basis
    • PFDs (Process Flow Diagrams)
    • P&IDs (Piping & Instrumentation Diagrams)
    • Heat & Material Balances
    • Utility balances
    • Line sizing calculations
    • Relief and flare calculations
  • Define operating philosophy including startup, shutdown, turndown, and upset conditions
  • Ensure accurate representation of process control strategies within P&IDs

Process Simulation (Core Responsibility)
  • Develop, own, and maintain steady-state and dynamic process simulation models using:
    • Aspen HYSYS
  • Validate simulation models against:
    • Design basis
    • Vendor data
    • Operating conditions
  • Perform sensitivity studies and optimization analyses
  • Generate simulation-based deliverables including:
    • Stream tables
    • Equipment duty calculations
    • Control strategy inputs
  • Support dynamic simulation where required for control philosophy validation
  • Ensure alignment between simulation outputs and engineering deliverables (PFDs, datasheets, P&IDs)

Engineering Deliverables
  • Develop and review:
    • Process datasheets (equipment, valves, instruments)
    • Control narratives (in coordination with I&C)
    • Cause & effect inputs
    • Process calculations and reports
  • Ensure consistency between simulation models and issued documentation

Integration & Coordination
  • Work closely with Mechanical, I&C, and Design teams to ensure:
    • Equipment sizing aligns with simulation outputs
    • Control philosophy reflects process dynamics
    • Layout supports operability and maintainability
  • Participate in HAZOP, design reviews, and interdisciplinary coordination

Vendor & Package Integration
  • Define process requirements for vendor packages
  • Review vendor process design, calculations, and performance guarantees
  • Validate vendor data against simulation assumptions
  • Ensure seamless integration of vendor systems into overall process package

Fabrication & Execution Support
  • Ensure process design is aligned with skid fabrication constraints
  • Support FAT, commissioning, startup, and troubleshooting
  • Resolve process-related issues during fabrication and operation

Standards & Compliance
  • Ensure compliance with industry standards and client specifications
  • Support safety, operability, and reliability reviews

Qualifications
  • Bachelor's degree in Chemical Engineering
  • 10-15+ years of experience in oil & gas, LNG, cryogenic, or EPC industries
  • Advanced proficiency in process simulation tools (Aspen HYSYS, Aspen Plus, UniSim)
  • Strong experience linking simulation outputs to engineering deliverables
  • Experience with skid-mounted systems and modular design
  • Strong understanding of ENGINEERING workflows

Preferred Qualifications
  • Experience with dynamic simulation and control validation
  • Experience with cryogenic or industrial gas processes
  • Background in packaged equipment or modular systems

Desired Attributes
  • Strong system-level thinking
  • Ability to translate simulation into practical design decisions
  • Strong coordination and communication skills
  • Execution-focused mindset

Work Environmental and Physical Demands:
  • In order to perform the duties of this job, the employee may be required to stand, walk, sit, reach with hands and arms, climb or balance, stoop or kneel, talk and hear, and use fingers and hands to feel objects, tools or controls.
  • Overtime may be necessary as the workload dictates. This may include week days, weekends, nights and/or holidays.
  • Job will generally be performed in an office environment, but may require travel to a customer's office, production facility or industrial/construction job site. Conditions will vary at each location, but the conditions listed above will generally apply.

The knowledge, skills and abilities listed above are typically acquired through the levels of education and experience listed. An equivalent combination of education and/or experience that provides an applicant with the listed knowledge, skills and abilities required to perform the essential duties and responsibilities of the job, may be accepted.
Other Duties
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.
Salary: $85,000 - $120,000 annually
EEOC Statement
Nikkiso CE&IG is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

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