Process Engineer II - III

Oxylus Energy; Branford (CT); On-site; USD 90,000 - 110,000; Full time

Benefits offered by this job

Competitive salary

Medical, dental, and vision coverage

Paid sick days and vacation

401k match

Inclusive work environment

Job summary

Oxylus Energy is seeking a Process Engineer II-III to own the balance of plant for CO₂ electrolyzer integrations and to lead the piping and downstream processing toward pilot scale. The role requires hands-on design, building, commissioning, and operating high-pressure reactor systems with safety as a core focus.

You will collaborate with electrochemists, materials scientists, and mechanical/control engineers to move the process from lab to pilot scale, ensuring compliance with codes and safe

Qualifications

• Bachelor or higher degree in chemical engineering with relevant experience.
• Hands-on experience with high-pressure reactor systems.
• Experience with heterogeneous catalysis and catalyst testing.
• Strong safety focus around pressurized gases and hazardous systems.
• Ability to develop process designs and models and review PFDs/P&IDs.

Responsibilities

• Own the design and specification of the balance of plant (CO2 supply, conditioning, separation, purification, compression, water management, heat exchange, product handling).
• Lead integration of electrolyzer with downstream catalytic processes and match stream conditions.
• Design, build, and operate high-pressure reactor systems and evaluate catalyst performance.
• Develop reactor designs and process models using mass/energy balances, kinetics, and heat transfer analysis.
• Specify pumps, compressors, heat exchangers, separators, valves; liaise with vendors for quotes/deliveries.
• Create and maintain PFDs, P&IDs, and equipment datasheets.
• Conduct process hazard analyses (HAZOP) for high-pressure gas systems and ensure code compliance.
• Commission and troubleshoot integrated systems; analyze data to improve performance.
• Support techno-economic analysis and scale-up planning with design inputs.
• Engineer III: set process architecture, lead pilot-scale design, mentor engineers.

Skills

Reactor design

Mass and energy balances

PFDs & P&IDs

Safety and risk awareness

Problem solving

Communication skills

Education

B.S. Chemical Engineering

M.S./Ph.D. in Chemical Engineering (optional)

Tools

Aspen Plus

Aspen HYSYS

PSA or membrane separation

Job description

Process Engineer II - III

On-site, Branford, CT (must be willing to relocate to the Bridgeport/Stamford area within one year of the start date)

About Oxylus Energy

Oxylus Energy is a climate-tech company building solutions that can scale. Our breakthrough electrochemical technology converts carbon dioxide into low-carbon fuels and chemicals, reducing the world's dependence on fossil fuels. We are a team of scientists, engineers, and problem solvers working to make that future real.

Job brief

As Process Engineer, you will own the balance of plant for Oxylus’ CO₂ electrolyzer systems and lead the integration of our electrolyzer technology with downstream thermal heterogeneous catalysis. You will design the processes that supply, condition, separate, compress, and convert gases around our electrolyzer stack, turning CO-rich product streams into feedstocks for processes such as Fischer-Tropsch or methanol synthesis.

This is a hands-on role. You will develop process designs and models, and you will also build, commission, and operate high-pressure reactor systems and pilot equipment in the lab. You will work closely with our electrochemists, materials scientists, mechanical and controls engineers, and leadership to move our integrated process from the lab toward pilot scale. Because our systems handle pressurized and hazardous gases, including CO and H₂, safe design and operation are central to this job. We are hiring at the Engineer II or III level and will match the title to your experience.

What You Will Do

• Own the design and specification of the balance of plant, including CO₂ supply and conditioning, gas separation and purification, compression, water management, heat exchange, and product handling.

• Lead the integration of our electrolyzer with downstream thermal heterogeneous catalytic processes, including matching stream composition, pressure, temperature, and flow between unit operations.

• Design, build, and operate high-pressure catalytic reactor systems, and evaluate catalyst performance, including activity, selectivity, and stability.

• Develop reactor designs and process models, using mass and energy balances, kinetics, and heat-transfer analysis to size equipment and set operating conditions.

• Select and specify pumps, compressors, heat exchangers, separators, valves, and other process equipment, and work with vendors on quotes and delivery.

• Create and maintain process flow diagrams (PFDs), P&IDs, and equipment datasheets.

• Lead or contribute to process hazard analyses, such as HAZOP, for high-pressure and hazardous-gas systems, and make sure designs follow applicable codes and standards.

• Commission and troubleshoot integrated systems, analyze process data, and use results to improve performance and reliability.

• Support techno-economic analysis and scale-up planning by providing process design inputs and performance data.

• At the Engineer III level: set the process architecture for integrated systems, lead pilot-scale design efforts, and mentor other engineers.

Who You Are

• A degree in chemical engineering or a related field, with experience matching the level:

  • Engineer II: B.S. with 2–4 years or M.S. with 1–2 years of relevant experience.

  • Engineer III: B.S. with 4–6 years, M.S. with 2–4 years, or Ph.D. with 0–2 years of relevant experience.

• Hands-on experience designing, building, or operating high-pressure reactor systems.

• Experience with heterogeneous catalysis, including catalyst testing and performance evaluation.

• Solid grounding in reactor design, kinetics, and mass and energy balances.

• Experience specifying, operating, or troubleshooting pumps and compressors.

• Ability to create and review PFDs and P&IDs.

• A strong commitment to safety, especially around pressurized systems and flammable or toxic gases.

• Highly attentive to detail, with strong problem-solving and organizational skills.

• Good written, verbal, and presentation skills.

Nice to Have

• Direct experience with syngas conversion, such as Fischer-Tropsch or methanol synthesis.

• Experience with process simulation tools such as Aspen Plus or Aspen HYSYS.

• Experience with gas separation technologies, such as pressure swing adsorption (PSA) or membrane separation.

• Familiarity with pressure equipment codes such as ASME Boiler and Pressure Vessel Code Section VIII and ASME B31.3.

• Experience scaling processes from lab to pilot plant.

• Familiarity with electrolyzers or other electrochemical systems.

Salary

• Engineer II: USD 90,000 - 100,000 per year base salary commensurate with experience, education, and skills.

• Engineer III: USD 100,000 - 110,000 per year base salary commensurate with experience, education, and skills.

Benefits

• Competitive salary

• Medical, dental, and vision coverage

• Paid sick days and vacation

• 401k match

• A diverse and inclusive work environment

Equal opportunity

We believe the distinct contributions of each person fuel our success. To keep our products and culture inclusive of all viewpoints and experiences, Oxylus Energy does not discriminate on the basis of race, color, religion, sex, national origin, gender identity or expression, sexual orientation, age, marital status, veteran status, disability, or any other characteristic protected by law.