Scientist Full-time

Associate Principal Scientist – Mammalian Cell Culture

Location: Slough, United Kingdom The actual location of this job is in Slough, UK.

At our Slough site, you'll join a growing R&D team developing next-generation mammalian cell culture technologies that help shape the future of biologics manufacturing. This is a hands-on laboratory role where your scientific expertise directly contributes to innovative bioprocess solutions for global customers.

What You Will Get

• An agile career and dynamic working culture.
• An inclusive and ethical workplace.
• Compensation programs that recognize high performance.
• A variety of benefits dependent on role and location.

What You Will Do

• Design, execute, and analyse complex mammalian cell culture experiments to support development and optimisation of upstream bioprocesses.
• Set up, operate, and maintain lab-scale bioreactors (3–10 L) to evaluate fed-batch and perfusion processes.
• Work closely with upstream R&D colleagues to plan and deliver non-routine bioreactor studies that drive process improvements.
• Perform routine mammalian cell culture activities, including media preparation, cell revival, and subculture.
• Generate high-quality experimental data, contribute to study plans and technical reports, and prepare presentations for internal stakeholders.
• Support adherence to laboratory procedures, safety assessments, and good documentation practices.
• Contribute to general laboratory operations and housekeeping activities as required.

What We Are Looking For

• Experience in mammalian cell culture and upstream bioprocess development, ideally within biopharma, biotechnology, or a related scientific environment.
• Hands-on expertise with lab-scale bioreactors and monitoring of key bioprocess parameters.
• Strong analytical and problem-solving skills, with the ability to interpret complex experimental data.
• Ability to work collaboratively within a multidisciplinary R&D team and manage multiple experimental workflows.
• Clear and structured communication skills, including scientific writing and presentation.
• A degree in a relevant scientific discipline (e.g., biotechnology, bioprocessing, biological sciences) or equivalent experience.
• A proactive, organised, and safety-focused approach to laboratory work.

About Lonza

At Lonza, our people are our greatest strength. With 30+ sites across five continents, our globally connected teams work together every day to manufacture the medicines of tomorrow. Our core values of Collaboration, Accountability, Excellence, Passion and Integrity reflect who we are and how we work together. Everyone's ideas, big or small, have the potential to improve millions of lives, and that's the kind of work we want you to be part of.

Innovation thrives when people from all backgrounds bring their unique perspectives to the table. At Lonza, we value diversity and are committed to creating an inclusive environment for all employees. If you're ready to help turn our customers' breakthrough ideas into viable therapies, we look forward to welcoming you on board.

Ready to shape the future of life sciences? Apply now.