Sr. Scientist, Lentivirus Upstream Processing

Role Overview

The Senior Scientist, Lentivirus Upstream Process Development, will be a core technical contributor responsible for designing, executing, and optimizing upstream production processes for lentiviral vectors (LVV) within our innovative pipeline. This role focuses on delivering high-quality, high-titer vector products to support LVV generation and other advanced cell therapy programs.

The successful candidate will apply technical expertise in upstream processing (USP)-including seed train optimization, mammalian cell culture (HEK293/HEK293T), large-scale transient transfection, and bioreactor scale-up-to ensure processes are robust, scalable, and phase-appropriate for GMP manufacturing.

This position demands a blend of hands-on technical mastery and strong analytical thinking to support project timelines while maintaining a patient-focused approach.

Key Responsibilities

• Design and execute experimental strategies for lentiviral vector upstream production.
• Perform development and optimization of upstream processes, including seed train expansion, suspension mammalian cell culture (HEK293/HEK293T), plasmid transient transfection optimization, and feed batch/perfusion bioprocessing in stir-tank and rocker bioreactors.
• Support the establishment and validation of bioreactor scale-up and scale-down models to ensure process comparability and predictability.
• Support the translation of bench-scale processes to GMP manufacturing, assisting in technology transfer and providing troubleshooting support during clinical production runs.
• Execute study protocols to define operating parameters, feeding strategies, and performance limits; maintain accurate documentation for USP data.
• Communicate technical findings, issues, and potential delays to project leads in a timely manner.
• Collaborate with cross-functional team members, including CMC Project Management and other technical leads, to support project goals.
• Apply scientific knowledge and technology to optimize vector titer, specific productivity, and quality.
• Support team activities by providing technical guidance to junior staff, fostering a culture of scientific rigor and continuous improvement.
• Author and review technical documents, including development reports, SOPs, and relevant sections for regulatory submissions (IND).
• Work closely with Downstream Process Development and Analytical Development teams to ensure integrated process outcomes.
• Support tech transfer activities to/from other Legend sites or CDMOs.
• Ensure compliance with all internal and regulatory requirements.

Requirements

• Advanced degree (PhD preferred, or MS) in Chemical Engineering, Bioengineering, or a related field.
• Experience: 5-8 years (PhD) or 8+ years (MS) of experience in process development or manufacturing within a biotech or pharmaceutical setting
• Hands-on experience in mammalian cell culture (HEK293, HEK293T), seed train expansion, feeding strategy, and transient transfection optimization specifically for viral vectors (Lentivirus preferred).
• Demonstrated proficiency in developing and implementing bioreactor scale-up and scale-down models.
• Solid understanding of GMP manufacturing requirements and CMC strategies for early-phase clinical trials.
• Direct experience with cell and lentiviral vector technologies within the current emerging field.
• Working knowledge in engineering modeling, mass transfer, and bioprocess optimization.
• Strong interpersonal and communication skills; ability to maintain focus and collaborate effectively during challenging development timelines.
• Analytical and creative thinking.
• Effective troubleshooting skills.
• Preferred experience in handling large-scale (>50L, e.g., 200L/500L) upstream bioreactor processes.
• Language(s):
• English. Mandarin is a plus.

• #Li-RP1
• #Li-Hybrid

Pay and benefits

The base pay range below is what Legend Biotech USA Inc. reasonably expects to offer at the time of posting. Actual compensation may vary based on experience, skills, qualifications, and geographic location. The company reserves the right to modify this range as needed and in accordance with applicable laws.

Other Types of Pay: Performance-based bonus and/or equity is available to employees in eligible roles.

Benefits and Paid Time Off

Medical, dental, and vision insurance as well as a 401(k) retirement plan with a company match that vests fully on day one. We offer eight (8) weeks of paid parental leave after just three (3) months of employment, and a paid time off policy that includes vacation time, personal time, sick time, floating holidays, and eleven (11) company holidays.

Additional voluntary benefits include flexible spending and health savings accounts, life and AD&D insurance, short- and long-term disability coverage, legal assistance, and supplemental plans such as pet, critical illness, accident, and hospital indemnity insurance.

We also provide voluntary commuter benefits, family planning and care resources, well-being initiatives, and peer-to-peer recognition programs; demonstrating our ongoing commitment to building a culture where our people feel empowered, supported, and inspired to do their best work.

Pay Range (Base Pay)

$127,313—$167,099 USD

Please note: These benefits are offered exclusively to permanent full-time employees. Contractors are not eligible for benefits through Legend Biotech.