Senior Process Engineer

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.

Responsibilities

• 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
• 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)
• 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
• 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
• 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
• Support FAT, commissioning, startup, and troubleshooting, Resolve process-related issues during fabrication and operation
• 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

Environmental & 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.

Schedule

Full-time, Monday-Friday, 8:00 AM - 5:00 PM

Benefits

Nikkiso CE&IG offers competitive benefits including health insurance, retirement plans, paid time off, and more. Specific details are subject to change and will be communicated to the successful candidate.

Pay

$85,000 - $120,000 annually