Arcellx, Inc. ( is a clinical-stage biotechnology company reimagining cell therapy by engineering innovative immunotherapies for patients with cancer and other incurable diseases. Arcellx believes that cell therapies are one of the forward pillars of medicine and our mission is to advance humanity by developing cell therapies that are safer, more effective, and more broadly accessible. Our offices are located in Gaithersburg, Maryland, and Redwood City, California.

Arcellx's lead product candidate, CART-ddBCMA, is being developed for the treatment of relapsed or refractory multiple myeloma (r/r MM) in an ongoing study. CART-ddBCMA has been granted Fast Track, Orphan Drug, and Regenerative Medicine Advanced Therapy designations by the U.S. Food and Drug Administration.

Arcellx is also advancing its dosable and controllable CAR-T therapy, ARC-SparX, through two programs: ACLX-001 for r/r MM and ACLX-002 in relapsed or refractory acute myeloid leukemia and high-risk myelodysplastic syndrome.

The Director, Intellectual Property will be responsible for managing a variety of intellectual property (IP) matters. We are looking for an outstanding professional with a demonstrated ability to think strategically, analyze complex business issues, and utilize sound judgment to make valuable IP contributions.

At Arcellx, we value passion, curiosity, determination, and diversity, and look for candidates who demonstrate a genuine interest in our mission and alignment with our values.     

Key Responsibilities: 

  • Define Arcellx’s strategic IP roadmap, including developing and implementing strategies for protecting IP, building a competitive IP portfolio and maximizing commercial potential.
  • Work closely with research and discovery teams to identify and capture high value innovations.
  • Perform freedom to operate analyses and ongoing IP risk assessments for new technology.
  • Review proposed publications and presentations for IP impact.
  • Perform IP diligence for key transactions including partnerships and M&A.
  • Manage trademark prosecution and strategy.
  • Manage outside counsel for the preparation, filing, prosecution and management of U.S. and international patent and trademark portfolios.
  • Collaborate with cross-functional teams and counsel a variety of clients on IP matters.


  • JD from an accredited law school, admission in good standing to the bar of at least one state, and registration to practice before the U.S. Patent and Trademark Office.
  • At least five (5) years relevant legal practice experience, including experience in patent preparation and prosecution and IP due diligence, preferably in immunotherapy or biologics.
  • Top-notch legal, strategic thinking, communication, organizational and interpersonal skills.
  • Strong technical expertise in immunotherapy or biologics (e.g., advanced degree and/or substantial research/industry experience) is a plus.
  • Experience with contested proceedings (e.g., litigation, oppositions, IPRs) is a plus.
  • Understanding of key regulatory considerations in biologics drug development is a plus.


  • Has character and integrity. Committed to always doing what’s right.
  • Self-motivated and able to work autonomously. Can produce top-quality work with little oversight.
  • "No job is too small" mentality. Humble and willing to help others.
  • Able to build strong relationships and collaborate effectively with colleagues.
  • Gives direct, candid, and respectful feedback. Can receive feedback with curiosity and without getting defensive.
  • Always looking to improve and challenge the status quo. Gritty and determined.

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