Cement and Concrete engineer

Lead the development, testing, and validation of cement blends based on mineral carbonation products. You will own the technical development pathway from carbonated reactor output to concrete-ready product, building up the lab and testing facility, designing testing programmes, and developing SCM and cement blend formulations.

What you'll do

• Develop SCM blends using carbonated materials from Kalz's mineral carbonation reactor.
• Plan and conduct a range of tests for strength development, workability, durability, CO₂ reduction, cost, and market applicability.
• Design cement, mortar, and concrete formulations across different CEM types and binder systems.
• Support the development of certification, standardization, and market approval strategies for new cementitious materials.
• Measure and evaluate relevant material properties, including compressive strength, flexural strength, setting behaviour, workability, water demand, density, heat development, durability, and long-term performance.
• Plan and coordinate advanced characterisation where relevant, such as particle size analysis, XRD, TGA, SEM, BET, chemical analysis, and reactivity testing.
• Support external testing, third-party validation, and customer trials with cement and concrete producers.

What you'll need

• Degree in civil engineering, materials science, chemical engineering, mineral processing, or a related field.
• Practical experience with cement, mortar, concrete, SCMs, binders, or construction materials.
• Ability to take ownership of a product development programme in a fast-moving startup environment.
• Strong understanding of concrete mix design, cement hydration, strength development, and durability.
• Familiarity with material characterisation techniques such as XRD, TGA, SEM, particle size analysis, BET, or chemical analysis.
• Strong analytical skills and the ability to connect material properties to product performance.
• Clear communication and documentation skills.

What they offer

• Central technical role in a climate-tech startup with significant ownership and real-world industrial relevance in Berlin.
• Inclusive, diverse, and respectful workplace.