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I am a mechanical and materials engineer with hands-on experience in Li-ion battery cell design and material development, with a passion for sustainable energy and practical, data-driven problem solving. I have collaborated across global suppliers and internal teams to optimize cycle life, perform rigorous validation, and drive efficient manufacturing processes while maintaining a safety-first mindset.…I am a mechanical and materials engineer with hands-on experience in Li-ion battery cell design and material development, with a passion for sustainable energy and practical, data-driven problem solving. I have collaborated across global suppliers and internal teams to optimize cycle life, perform rigorous validation, and drive efficient manufacturing processes while maintaining a safety-first mindset.

Stephen Jose Mathew

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I am a mechanical and materials engineer with hands-on experience in Li-ion battery cell design and material development, with a passion for sustainable energy and practical, data-driven problem solving. I have collaborated across global suppliers and internal teams to optimize cycle life, perform rigorous validation, and drive efficient manufacturing processes while maintaining a safety-first mindset.…I am a mechanical and materials engineer with hands-on experience in Li-ion battery cell design and material development, with a passion for sustainable energy and practical, data-driven problem solving. I have collaborated across global suppliers and internal teams to optimize cycle life, perform rigorous validation, and drive efficient manufacturing processes while maintaining a safety-first mindset.

Available to hire

I am a mechanical and materials engineer with hands-on experience in Li-ion battery cell design and material development, with a passion for sustainable energy and practical, data-driven problem solving.

I have collaborated across global suppliers and internal teams to optimize cycle life, perform rigorous validation, and drive efficient manufacturing processes while maintaining a safety-first mindset.

Skills

Experience Level

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Swedish

Advanced

Work Experience

Public Materials Engineer - Cell Design at Northvolt AB

February 1, 2023 - June 1, 2025

Responsible for development of Active materials into EV and ESS cells, from material selection to production. Led high Nickel CAM improvement projects in optimizing cycle life and performance. Developed and executed comprehensive test protocols for cell validation, including performance, life cycle, EIS and safety tests. Responsible for materials screening (LFP, LFMP, NMC) through data analysis by testing on lab scale and evaluation through DOEs on pouch cells. Achieved a 90% success rate in troubleshooting cell defects through systematic root cause analysis and teardown investigations. Cross-collaborated with global suppliers and internal cell design, quality and testing departments.

R&D Lead Technician - Cell Disassembly at Northvolt AB

February 1, 2022 - January 1, 2023

Responsible for safe, hands-on teardown of 500+ prismatic cells, delivering critical failure analysis data that directly supported product qualification. Contributed to 90% of all successful cell benchmarking projects through leading and managing cell postmortem reports. Led a team of 4 technicians, conducted research and teardown training, and maintained an organized workflow, achieving a 95% success rate in team performance and delivering timely reports. Contributed 2 new disassembly jig designs for new cell formats, supporting mechanical design team, and ensured disassembly safety and efficient procedures.

Materials Development Engineer at Northvolt AB

January 1, 2022 - January 1, 2025

Contributed to testing and optimizing active materials in EV batteries. Worked with advanced battery technologies and life cycle testing. Supported cell design and development by ensuring compliance with relevant design standards and customer requirements. Involved in hands-on testing and the continuous improvement of material properties and test methods. Collaborated with engineers, project managers, and customers to align technical requirements with deliverables while maintaining high standards for data accuracy and system reliability.

Mechanical Design Engineer at Jordi Hans Design

August 1, 2020 - December 1, 2021

Responsible for the Design and development of the Mink Mini Camper - a single axle trailer caravan, in accordance with requirements from an international customer. Created 2D/3D CAD, BOM and technical documents for interior components. Created part design and assembly of interior parts and fixtures, implemented Design for Assembly (DFA) for interior components and successfully reduced manufacturing cost by 20%. Conducted FMEA analysis on critical design elements to reduce potential failure points by 40%. Contributed with new concept designs of future caravan models (Cortes 47 and tear-drop camper).

Mechanical Designer and Material Specialist at Jordi Hans Design

January 1, 2020 - December 31, 2021

Contributed on the part and structure design of the Mink Mini Camper project, a single axle trailer caravan. Created 2D and 3D technical drawings of caravan parts and assemblies in SolidWorks. Ensured part designs met performance and road safety standards. Led and trained interns in 3D printing workshops and collaborated with the manufacturing team for material selection. Conducted market research, supplier and customer meetings.