Role OverviewThe Principal Scientist, Lentivirus Upstream Process Development, will be a key technical leader responsible for designing, optimizing, and scaling 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 drive scientific excellence in upstream processing (USP)-including seed train optimization, mammalian cell culture (HEK293 and HEK293T), large-scale transient transfection, and bioreactor scale-up and scale-down model-ensuring processes are robust, scalable, and phase-appropriate for GMP manufacturing. This position demands a blend of hands-on technical mastery and strategic thinking to accelerate timelines while maintaining a patient-focused approach
Key Responsibilities- Design and execute highly efficient upstream production strategies for lentiviral vectors.
- Direct the development and optimization of upstream processes including but not limited to: seed train expansion, suspension mammalian cell culture (HEK293/HEK293T), plasmid transient transfection optimization, and feed batch/perfusion bioprocessing in stir-tank and rocker bioreactors.
- Establish and validate robust bioreactor scale-up and scale-down models to ensure process comparability and predictability across different manufacturing scales.
- Direct the translation of bench-scale processes to GMP manufacturing, ensuring seamless technology transfer and providing troubleshooting support during clinical production runs.
- Provide hands-on training as needed.
- Lead the execution of study protocols to define operating parameters, feeding strategies, and performance limits; implement state-of-the-art knowledge management for USP data.
- Communicate the potential for issues and delays along with solutions and mitigation approaches.
- In collaboration with the Senior Leaders, CMC Project Manager, Project Leader, and other technical leads, identify project acceleration opportunities.
- Leverage advanced science and technology to maximize vector titer, specific productivity, and quality, identifying creative solutions to define unknowns in the viral vector production field.
- Guide a team of scientists in the execution of project-specific activities, fostering a culture of transparency, scientific rigor, and continuous improvement.
- Author and serve as a primary reviewer for technical documents, including development reports, SOPs, and CMC sections for regulatory submissions (IND).
- Work closely with Downstream Process Development and Analytical Development teams to ensure integrated and holistic process outcomes.
- Tech transfer process to/from other Legend sites or CDMOs.
- Resolve conflict and proactively identify/address performance issues.
- Ensure compliance with regulatory requirements.
Requirements- Advanced degree (PhD preferred, or MS) in Chemical Engineering, Biomedical Engineering, Virology, Molecular Biology, or a related field.
- 8+ years (PhD) or 10+ years (MS) of experience in process development or manufacturing within a biotech or pharmaceutical setting
- Deep technical hands-on experience in mammalian cell culture (HEK293, HEK293T), seed train expansion, feeding strategy and transient transfection optimization specifically for viral vectors (Lentivirus preferred).
- Proven expertise in developing and implementing bioreactor scale-up and scale-down models.
- Strong understanding of GMP manufacturing requirements and CMC strategies for early-phase clinical trials.
- Deep knowledge and hands-on experiences in cell and lentiviral vector technologies within the current emerging field
- Strong knowledge in engineering modeling, mass transfer, and bioprocess optimization.
- Excellent leadership, emotional intelligence, and communication skills; ability to maintain composure and strategic focus during challenging development timelines.
- Creative, strategic thinking.
- Strong troubleshooting skills
- Preferred experience in handling large-scale (>50L, e.g., 200L/500L) upstream bioreactor processes.
- Language(s): English. Mandarin is a plus.
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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):
$146,410-$192,164 USD
Please note: These benefits are offered exclusively to permanent full-time employees. Contractors are not eligible for benefits through Legend Biotech. 
