Associate Director, CMC, Drug Substance

Who We Are:

Xenon Pharmaceuticals (NASDAQ:XENE) is a neuroscience-focused biopharmaceutical company dedicated to drug discovery, clinical development, and commercialization of life-changing therapeutics for patients in need. We are looking for great people who thrive in a respectful, collaborative, inclusive, and productive culture to join the Xenon team.

We are advancing an exciting product pipeline to address indications with high unmet medical need, including epilepsy, depression and pain. Our Phase 3 azetukalner program represents the most advanced, clinically validated potassium channel modulator in late-stage clinical development for multiple indications. In March 2026, we announced positive topline data from our Phase 3 X-TOLE2 study of azetukalner in focal onset seizures (FOS), and we anticipate submitting a New Drug Application to the Food and Drug Administration in the third quarter of 2026.

Our Phase 3 epilepsy program also includes a second FOS study, X-TOLE3, which would support regulatory submissions outside the U.S., and the X-ACKT study in primary generalized tonic-clonic seizures, which would support regulatory submissions for an additional epilepsy indication. We also have multiple Phase 3 azetukalner clinical trials underway in major depressive disorder (MDD) and bipolar depression (BPD), based on topline data from our Phase 2 X-NOVA clinical trial.

In addition, we are proud of our strong heritage in human genetics, deep understanding of ion channel biology, and expertise in novel chemistries to enable potent, selective ion channel targeting. We continue to advance an early-stage pipeline of novel therapeutic candidates, including Phase 1 studies for XEN
1701 and XEN
1720 (targeting Nav
1.7) and XEN
1120 (targeting Kv7), which are being developed for pain. Backed by a strong balance sheet to support our growth plans, we continue to build a fully integrated, premier neuroscience company with strong discovery, clinical development, corporate, and commercial operations.

We are seeking an Associate Director, CMC, Drug Substance to join our CMC Drug Substance team. The candidate will help manage and oversee the development and manufacturing of cGMP small molecule active pharmaceutical ingredients (APIs) for deployment in pre-pivotal and pivotal clinical trials. The Associate Director will be a key member of a highly collaborative internal CMC team, primarily managing API development programs and manufacturing campaigns through contract development and manufacturing organizations (CDMOs).

This position reports to the Senior Director, CMC, Drug Substance, and will be based out of Boston, MA, USA. We will consider remote locations for exceptional candidates.

• Manage and oversee the development and manufacturing of small molecule APIs in accordance with applicable quality and regulatory standards Evaluate, recommend and manage qualified CDMOs for the manufacture of API for clinical trials, as well as for commercial use
• Collaborating closely with the internal process chemistry team, manage API process technology transfer to the Company’s CDMOs, including process development and the establishment of suitable specifications for APIs
• Work closely with Supply Chain and CMC Drug Product colleagues to translate clinical demand forecasts into API manufacturing plans
• Author (in conjunction with Technical Writing) and/or act as a key reviewer of core CMC documents/modules and other forms of submissions and responses to FDA and other Competent Authorities providing strategic oversight and consistency for regulatory interactions, including, but not limited to, IND/NDA/MAA/IMPD filings and periodic updates thereto
• Participate and manage API-related budget proposals and approved project budgets in accordance with the Company’s strategic and operating plans and Finance policies
• Serving as the subject matter expert, participate in audits and inspections of API CDMOs in conjunction with Quality Assurance
• Act in accordance with Company policies, including, for example, the Code of Business Conduct and Ethics and Intellectual Property policies. Ensure that policies are understood and followed by direct reports.
• Some international travel may be required
• Other duties as assigned

• PhD in Chemistry or other relevant discipline with a minimum of 10 years of directly related experience in a pharma or biotech environment. Candidates with a MSc and significant relevant experience may be…