Senior Engineer​/Principal Engineer, Lentivirus Downstream Process Development

Legend Biotech is a global biotechnology company dedicated to treating and, one day, curing life‑threatening diseases. Headquartered in Bridgewater, New Jersey, we are advancing the next generation of cell therapy through a portfolio of innovative technologies, including autologous, allogeneic, and in vivo cell therapy approaches. Our research spans chimeric antigen receptor T‑cell (CAR‑T), T‑cell receptor (TCR‑T), natural killer (NK) cell‑based therapies, and other emerging platforms designed to transform the treatment of serious diseases.

From our global network of research and development sites, we are committed to discovering and developing safe, effective, and cutting‑edge therapies for patients worldwide.

Legend Biotech entered into a global collaboration agreement with Johnson & Johnson to jointly develop and commercialize CARVYKTI® (ciltacabtagene autoleucel; cilta‑cel). Through this strategic partnership, we combine complementary expertise and capabilities to advance innovative immunotherapies for patients living with multiple myeloma.

Legend Biotech is seeking a Senior Engineer / Principal Engineer, Lentivirus Downstream Process Development as part of the Technical Development team based in Somerset, NJ.

The Senior Engineer / Principal Engineer, Lentivirus Downstream Process Development will be responsible for designing, optimizing, and scaling purification processes for lentiviral vectors (LVV) within our innovative pipeline. This role focuses on delivering high‑quality vector products to support LVV generation and other advanced cell therapy programs. The successful candidate will drive scientific excellence in scaling automation capabilities from concept to operation, integrating analytics and modeling into downstream workflows, and translating microscale insights into robust, scalable processes for GMP manufacturing.

The level and scope of responsibility will be determined based on the candidate's experience, technical expertise, and demonstrated impact.

• Build state‑of‑the‑art mechanistic and hybrid models that directly influence the development of LVV downstream processing, building operational efficiency through model‑first and AI‑enabled development strategies.
• Apply core engineering concepts including mass transfer, fluid mechanics, and thermodynamics to build robust in silico process models.
• Perform data analytics using ML algorithms for modeling and clustering to generate process insights.
• Working closely with the team to implement development and optimization of downstream processes including clarification (depth filtration, centrifugation), chromatography (AEX, SEC, HIC), and Tangential Flow Filtration (TFF).
• Lead or support the translation of bench‑scale processes to GMP manufacturing, ensuring seamless technology transfer and providing troubleshooting support during clinical production runs.
• Design/Implement different Advanced Process Control (APC) strategies (e.g., MPC, State Estimators) to optimize process performance.
• Communicate potential issues and delays along with solutions and mitigation approaches.
• In collaboration with senior leaders and cross‑functional partners, identify project acceleration opportunities.
• Leverage advanced science and technology to maximize vector recovery, purity, and potency.
• Provide technical guidance and collaborate with scientists and cross‑functional team members in the execution of project‑specific activities.
• Author and serve as a primary reviewer for technical documents, including development reports, SOPs, and CMC sections for regulatory submissions.
• Work closely with Upstream Process Development and Analytical Development teams to ensure integrated process outcomes.
• Tech transfer process to/from…