Senior Scientist, LNP Platform & Process Development

Job Description

Job Description

About Tr1X

Tr1X is a private, clinical-stage biotechnology company focused on developing a novel class of regulatory T cell-based products to cure autoimmune and inflammatory diseases. Founded by industry experts, including the scientists who discovered Type 1 regulatory T (Tr1) cells, the company is developing a pipeline of off-the-shelf allogeneic cell therapies for autoimmune diseases with high unmet medical need. Our TRX cells are designed to mimic the function of naturally occurring Tr1 cells, which work to restore immune tolerance, stopping severe autoimmune and inflammatory disease in its tracks. Tr1X is the first company ever to use an allogeneic engineered Tr1 cell therapy in clinical trials. Tr1X is headquartered in San Diego, CA. For more information, please visit

Position Summary

The Senior Scientist, LNP Platform & Process Development (Scientist) is an experienced hands-on, lab-based, individual contributor that leads the design, development, and optimization of lipid nanoparticle (LNP) formulation and process development efforts supporting the Tr1X in vivo CAR-Treg platform. This individual plays a central role in developing and advancing the targeted lipid nanoparticle (tLNP) delivery systems from early research optimization through scalable, IND-enabling development.

This is a high-impact, foundational role within the company. The Scientist helps design and implement the LNP backbone of the platform and influence both short-term program execution and long-term manufacturability strategy. The Scientist brings deep hands-on expertise in LNP formulation and process development, strong analytical rigor, and the ability to thrive in a fast-paced startup environment.

Key Responsibilities

• Contribute to the design, development, and optimization of LNP formulations for mRNA delivery, including targeted LNP systems incorporating conjugated or functionalized lipids.
• Evaluate lipid composition, formulation parameters, and mixing conditions to optimize particle size, polydispersity, encapsulation efficiency, stability, release characteristics, and biological performance.
• Develop scalable, GMP-compatible manufacturing processes to support program advancement.
• Apply Quality by Design (QbD) principles and Design of Experiment (DoE) studies to study design and execution.
• Lead the development and optimization of analytical characterization methods (both in-house and at the external CDMO), including but not limited to DLS, fluorescence-based assays such as Ribogreen, HPLC/UPLC methods (CAD, UV, IP-RP, SEC, IEX), LC-MS, and endotoxin testing.
• Interpret analytical and stability data to establish meaningful correlations between physicochemical properties and biological function.
• Collaborate closely with platform biology teams to support in vitro and in vivo studies, prepare development reports and technical documentation, and contribute to technology transfer activities with external CDMO partners.
• Spearhead IND-enabling documentation and contribute to defining the long-term strategy for scalable LNP platform development.
• Perform other responsibilities as required based on business needs.

Required Qualifications & Experience

• Ph.D. in Chemical Engineering, Bioengineering, Pharmaceutical Sciences, Chemistry, or a related field with a minimum 4 years of relevant industry experience; or M.S. with 8+ years; or B.S. with 10+ years.
• Demonstrated in-depth expertise in LNP formulation and process development, including hands-on experience with microfluidic or scalable mixing technologies and downstream purification strategies such as TFF.
• Strong experience with analytical characterization of LNP systems and application of statistical design tools for process optimization.
• Highly organized, scientifically rigorous, and capable of independently driving projects while collaborating effectively in a multidisciplinary startup environment.
• Experience with mRNA therapeutics or nucleic acid delivery systems.
• Prior exposure to immunotherapy or cell therapy platforms preferred.
• Familiarity with regulatory expectations for CMC development and experience supporting technology transfer to external manufacturing partners preferred.
• Experience correlating formulation attributes with in vivo performance highly desirable.
  Ability to actively serve, collaborate, and develop relationships inside and outside the organization.
• Excellent written and oral communication skills.
• Strong analytical and problem-solving skills; great attention to detail and the ability to drive timely and fact-based decision making.
• Ability to function in a rapidly changing environment and handle multiple priorities.
• Demonstrated ability to partner, build trust, and cultivate positive working relationships with CDMOs.
• Experience with mRNA production and analytical quality control preferred.
• Effectively communicate changes and resolve issues with CDMOs.
• Lead and/or participate in cross functional development and manufacturing projects to ensure company objectives are met and exceeded.
• Ability to don and wear appropriate clean room attire and wear all required Personal Protective Equipment.

Other Requirements

• Legally authorized to work for any employer in the U.S.
• Position is on site in San Diego
• Travel may be required up to 10% of the time

The job responsibilities and requirements provided above are intended to describe the general nature of the work performed by individuals assigned to this job classification. It is not intended to be an exhaustive list of all duties and requirements. Tr1X retains the right to add, change, or delete duties, education, experience or any other requirements of the position at any time.

Working at Tr1X

At Tr1X, our team is united by a singular shared mission: to transform patients' lives through breakthrough science. We are a group of skilled experts driven by urgency, innovation and a collaborative spirit. Our culture thrives on excellence, positivity, persistence and the agility to tackle new challenges head-on. With an unwavering commitment to patients, science and one another, we foster an environment where team members feel engaged, supported and empowered to make a meaningful impact. We envision a world where autoimmune diseases are not just being treated but are cured.

Base Pay Range Anticipated: $145,000 - $160,000

Tr1X considers a variety of factors to determine salary such as education, years of experience, time in the position level, training, knowledge, skills, geographic location, and the market value of the position.

Compensation and Benefits

Tr1X provides a fair and competitive total rewards program that includes base salary; discretionary annual target bonus; incentive stock options; 401(k) retirement plan with company contribution; health and welfare insurance plans for employees (and their families) that include medical, dental, vision, long-term and short-term disability, and life insurance; paid time off (PTO); and paid holidays.

Tr1X embraces a diverse, open, and inclusive environment and believes a strong culture connection is key to success. Tr1X is committed to fairness in recruitment, hiring, transfer, promotion or any other employment practice without regard to race, color, citizenship, national origin, ancestry, religion, sex, pregnancy, marital status, sexual orientation, gender, gender identity and expression, age, physical and medical disability, medical condition, genetic information, political affiliation, protected veteran status, or any other characteristic protected by law. If you are an individual needing assistance to complete an employment application or would like to request an accommodation, please contact the Human Resources department at View email address on ziprecruiter.com.

Notice to Employment Agencies

The Tr1X talent acquisition program is managed through internal resources, and unsolicited referrals and resumes are not accepted from employment agencies, unless advance written authorization is granted from the human resources department. Tr1X shall not be liable for any fees arising from any unsolicited or unauthorized candidate information received relative to position vacancies.