Mantel is a Series A startup backed by leading climate-tech venture capital firms. Mantel is developing the material solution to carbon capture. We have developed the only liquid phase carbon capture material that operates at high temperatures. Our molten borates enable new process designs that can increase thermal efficiency and reduce the cost of carbon capture and storage by more than 50%. Mantel’s solution will help to reduce CO2 emissions across a range of industrial sources including the generation of electricity with net negative emissions.

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Mantel is looking for a Process Engineer excited to join a promising carbon capture startup working on the development of molten salts as a novel CO₂ sorbent material. The Process Engineer will work with Mantel’s engineers and partner EPCs to design, build, commission, and operate Mantel’s first-of-a-kind demonstration system. This position will center around process modeling including development and validation of process and system operation models to support demonstration plant scale-up and transition to commercial systems. The role includes support of techno-economic analysis and equipment sizing/costing, and identification of data gaps and validation testing needs. The Process Engineer will also work with Mantel’s senior design engineers to perform process analysis/calculation/modeling, equipment specification including component sizing and data sheet review, create and optimize startup/shutdown procedures, and cross-discipline coordination with Mantel R&D team.  Mantel is looking for a well-organized, versatile technical problem solver who can think outside the box and communicate effectively in a multi-disciplinary team environment.  

Minimum Qualifications:

• Bachelors degree in engineering (Chemical) 

• Experience in industrial boiler/plant design, operation, and maintenance  

• Minimum 3 years process modelling experience with Aspen HYSYS and/or PPSD 

• Field experience in industrial boiler/plant commissioning 

• Strong background in safe plant operation, industrial safety, and process hazard analysis 

• Thorough understanding of engineering drawings, P&IDs, equipment specifications, and engineering commissioning/operating procedures 

Desired Qualifications:

• Experience with molten salt/metals or carbon capture systems 

• Experience modeling novel fluids in Aspen HYSYS 

• Experience working with external EPCs 

• Experience: Minimum 3-5 years of experience in an industrial setting.

• Location: Remote/Hybridg or In-person (Cambridge, MA). Up to 25% travel may be required.

Compensation & Benefits – we provide competitive and holistic compensation to all our full-time team members, including: 

• Highly competitive pay based on experience, including equity 

• 90% subsidized medical and dental healthcare coverage (50% for dependents) 

• Unlimited vacation policy, mental health personal days, generous sick leave, plus a week-long winter break at the end of December 

• Health/Fitness and cell phone stipend 

• Company matched 401k 

• Generous parental leave 

• Access to FSA/HAS and commuter benefits accounts 

This is an exciting opportunity to be an early hire in a new, well-funded company, with significant opportunity for advancement. Opportunity to be an early hire in a well-funded company, with significant opportunity for advancement.