(Senior) Manufacturing Engineer (m/f/x) | Climate Tech Startup

tozero is Europe’s leading deep-tech startup specializing in the recycling of lithium-ion batteries. Committed to securing critical raw material independence and regenerating materials, we are developing innovative and sustainable solutions for a cleaner future.

We are looking for an experienced (Senior) Manufacturing Engineer (m/f/x) to join our growing technical team.In this role, you will focus on the industrial-scale demo plant and support the industrialization of our hydrometallurgical recycling technology in an operational environment. You will work across equipment integration, detailed engineering, commissioning, start-up, and ramp-up to help translate technical concepts into reliable plant operations. This is an exciting opportunity to take ownership in a fast-paced startup environment and contribute directly to the deployment of cutting-edge recycling technology.

• Support the engineering, commissioning, start-up, and ramp-up of our industrial-scale demo plant

• Develop and refine manufacturing and plant concepts, including process layouts, block flow diagrams, and mass and energy balances

• Translate technical and process requirements into robust operational solutions for industrial-scale implementation

• Contribute to pre-feasibility, detailed engineering, and plant execution activities, including process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), and layout development

• Prepare technical specifications and data sheets for key equipment procurement

• Collaborate with internal teams, suppliers, and external partners to define technical requirements, milestones, and deliverables

• Plan and execute pre-commissioning, commissioning, start-up, and ramp-up activities

• Support troubleshooting and optimization of plant performance, reliability, and operability

• Plan and execute tests and validation activities on the industrial-scale demo plant

• Use simulations and engineering calculations to validate assumptions and support implementation decisions

• Test and qualify equipment at both company and supplier sites

• Help structure technical workstreams and project activities to achieve milestones on time and within scope

• Work closely with cross-functional teams across engineering, operations, and project execution

• 5+ years of experience in manufacturing, process, production, or industrial engineering, ideally in chemicals, mining, metallurgy, recycling, or related industries

• Strong hands-on experience with commissioning, start-up, and ramp-up activities in an industrial environment

• Experience working on industrial plants, demonstration plants, or scale-up facilities

• Familiarity with industrial process equipment such as pumps, valves, tanks, piping systems, and other plant infrastructure

• Experience with engineering documentation such as PFDs, P&IDs, BFDs, technical specifications, and change management systems

• Proficiency in process modeling, simulation, and engineering calculations

• Strong troubleshooting and problem-solving skills in operational and project settings

• Ability to work independently while collaborating effectively with cross-functional teams

• Ideally familiar with industry-relevant standards and regulations such as PED, ATEX, Machinery Directive, REACH, Seveso, ISO 9001, and ISO 14001

• German language skills are a plus

• Passion for sustainability and interest in cleantech, manufacturing, and battery recycling

At tozero, we believe in creating a supportive and dynamic work environment where you can grow, contribute, and make an impact.

• Fitness Subscription: Prioritize your well-being with a complimentary fitness subscription, promoting a healthy and active lifestyle.

• Education Budget: We encourage continuous learning and development. Benefit from an education budget to enhance your skills and knowledge.

• Free Snacks and Drinks in the Office: Stay energized throughout the day with a variety of snacks and beverages.

• Jobticket: Conveniently commute to work and all around Germany with our fully subsidized Deutschlandticket.

• Dynamic Startup Environment: Thrive in a highly dynamic startup culture, collaborating with experts in the field and contributing to innovative projects that shape the future