Innovation Process Engineer (m/f/d) - Reju

At Reju, you join a purpose-led company helping to build the Circular Textile System. 

Our purpose is to transform textile waste into a valuable resource and accelerate the transition to a circular textile industry. Joining Reju means combining purpose with action in a company where people are trusted to take ownership, move fast, and create meaningful impact. 

Reporting to the Head of Process Development & Scale-up, the Innovation Process Engineer will play a key role in improving Reju's existing recycling technologies while shaping the next generation of process solutions. This position combines hands-on process optimization at the Frankfurt demonstration plant with the development of future process concepts in collaboration with leading technology partners, engineering companies, and research institutions.

Innovation Process Engineer (m/f/d) – unlimited contract

Why Reju? - We offer:

• Meaningful work with global environmental impact and the opportunity to help shape a truly circular textile industry.


• Significant ownership and influence over key technology and scale-up decisions. 


• An entrepreneurial culture built on trust, transparency, collaboration, and accountability. 


• The opportunity to collaborate with an international, multidisciplinary team united by a shared purpose and ambition.


• Professional development and career growth opportunities as Reju continues to grow.


• Flexible ways of working with a strong focus on outcomes and impact.


• Competitive compensation and performance-based rewards. 


• The chance to contribute to one of the most advanced chemical recycling technologies driving textile circularity.

Your responsibilities will include:

• Become a technical expert in Reju's current recycling processes through hands-on work at the Frankfurt demonstration plant, identifying and implementing opportunities for process optimization, improved operability, and increased efficiency.


• Lead and support development projects aimed at transforming key batch operations into continuous industrial processes, with particular focus on extraction, crystallization, precipitation, solid-liquid separation, and related unit operations.


• Collaborate with external partners, technology providers, universities, and engineering companies to evaluate, test, and scale innovative process technologies for future commercial plants.


• Design, execute, and analyze laboratory, pilot, and demonstration-scale trials, translating results into process improvements and technology development roadmaps.


• Support technology scale-up activities by developing process concepts, mass and energy balances, engineering data packages, and technical recommendations for future facilities.

Your profile:

• Master's degree or PhD in Chemical Engineering, Process Engineering, Industrial Chemistry, or a related discipline.


• Minimum 3 years of industrial experience in process development, process engineering, pilot plant operation, scale-up, or technology development; experience with solid-liquid systems, crystallization, extraction, precipitation, or polymer-related processes is highly desirable.


• Strong understanding of chemical process design and scale-up principles, with the ability to bridge laboratory findings and industrial implementation.


• Demonstrated experience working with external partners, research organizations, engineering contractors, or equipment suppliers.


• Fluent English is mandatory; German is considered a strong advantage.

Are you curious?

Then we look forward to receiving your detailed application documents, stating your salary expectations and possible starting date to Michelle Cascante.

Reju www.reju.com 

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