Associate Director, Process Development and Manufacturing

Company: Assembly Biosciences, Inc.
Location: South San Francisco
Posted on: February 16, 2026

Job Description:

Job Description Job Description Salary: $194,600 - $209,200 annualized Summary: We are seeking an Associate Director, Process Development and Manufacturing. This person will be responsible for managing process chemistry activities for Assembly Biosciences small molecule compounds, including development of drug substance manufacturing routes, process scale-up, technology transfers and CMO management. Specific responsibilities include, but are not limited to: Leading drug substance development and manufacturing activities at CMOs to ensure seamless executions of the work packages and delivery of drug substance meeting all quality standards. Managing strategic CMOs to design, develop, and implement robust chemical synthesis processes for starting materials, intermediates, and APIs. Supporting technical transfer of starting material, intermediates, and API processes between sites as needed. Phase appropriate synthetic route design and implementation of control strategies for regulatory starting materials, intermediates, and APIs to support early and late-stage programs. Performing fate and purge studies, mutagenic impurity evaluation, and establishing the framework for the control strategy of the drug substance throughout the phases of development. Working closely with cross-functional teams to ensure seamless transitions between drug substance and drug product programs and vendors. Providing technical leadership in ensuring that CMO manufacturing facilities are compliant with cGMPs. Providing technical review and approval for batch records, development protocols, manufacturing deviations and investigations as well as technical reports. Defining strategies and designing experiments for process robustness studies and optimization in support of the process scale-up, transfer and validation. Providing technical support for manufacturing deviations, OOS/OOT investigations and troubleshooting. Reviewing and summarizing process development results and analytical data from CROs/CMOs, conducting trend analysis. Authoring and reviewing the drug substance sections of regulatory submission documents. Providing technical justifications to address any regulatory questions. Functioning as a highly effective communicator, discussion leader, and team player in a dynamic team culture. This job description outlines the primary duties and responsibilities of the role; however, it is not intended to be all-inclusive. The scope of responsibilities may be modified, expanded, or adjusted at the discretion of the organization to meet evolving business needs. Qualifications Include: PhD with 6 years experience or MS with 8 years or BS degree with 10 years experience of small molecule drug substance development experience in pharmaceutical or biotech industry. Strong technical skills in process development and manufacturing. Must have hands-on experience working in process chemistry along with in-depth knowledge on drug substance manufacturing equipment. Understand comprehensive global pharmaceutical regulatory requirements (e.g. cGMP, ICH, USP) Experience working with contract organizations for drug substance development, manufacturing and testing. Effective communication, interpersonal skills, collaboration and time management skills. Self-motivated, comfortable in fast-paced small company environment. Able to manage multiple projects simultaneously and adjust to changing program priorities. Pay Range: $194,600 - $209,200 annualized The stated pay range for this position reflects the San Francisco Bay Area job market. Assembly Bio establishes pay ranges based on geographic work locations. Additional factors such as academic credentials and relevant experience will influence the actual salary offered. About Assembly Bio Assembly Bio (NASDAQ: ASMB) is an ambitious biopharmaceutical company with cutting- edge therapeutic clinical candidates capable of improving the lives of millions living with chronic hepatitis B virus (HBV) infection around the world, and research and preclinical programs focused on the discovery of novel antivirals to treat devastating viral diseases, including HBV, hepatitis delta virus (HDV) and herpesviruses. We pride ourselves on creating a culture and work environment that is scientifically driven, ambitious, and collaborative. We encourage diversity of thought that leads to great innovation and are looking to add great people to our dynamic team who are driven to transform the lives of patients. We set our sights highand pursue our goals with determination. Our unique organization stands ready to welcome talented, motivated individuals, who share our ambitions. As an equal opportunity employer, we are committed to diversity and inclusion and will not tolerate discrimination and harassment of any kind. All employment decisions are based on business needs, job requirements and individual qualifications, without regard to race, color, religion or belief, national, social or ethnic origin, sex (including pregnancy), age, physical, mental or sensory disability, HIV status, sexual orientation, gender identity and/or expression, marital, civil union or domestic partnership status, past or present military service, family medical history or genetic information, family or parental status, or any other status protected by the laws or regulations in the locations where we operate. Information for Recruitment Agencies Assembly Bio does not accept from recruiters/agencies any unsolicited resumes, or any candidate information including blinded resumes and will not be responsible for any fees related to resumes or candidate information that is unsolicited. Please do not contact hiring managers or Assembly Bio employees directly with any information related to a resume or a candidate. We handle all recruiting through our internal Human Resources team, and we will reach out to you directly should we wish to engage in a search. Your willingness to comply with this will significantly impact any decision we may make about doing business with you.

Keywords: Assembly Biosciences, Inc., Daly City , Associate Director, Process Development and Manufacturing, Science, Research & Development , South San Francisco, California