Biostatistics Intern
Arcellx
Posted: February 18, 2026
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Quick Summary
We're seeking a Biostatistics Intern to join our team in Redwood City, CA, and assist in the development of cell therapy data analysis and modeling.
Required Skills
Job Description
Who We Are
Arcellx is a public, clinical-stage biotechnology company reimagining cell therapy by engineering innovative immunotherapies for patients with cancer and other incurable diseases. We believe that cell therapies are one of the forward pillars of medicine and our mission is to destroy cancer and advance humanity by developing cell therapies that are safer, more effective, and more broadly accessible.
Our team members are made up of talented innovators and dreamers working from our offices in Rockville, Maryland, and Redwood City, California. At Arcellx, we hire exceptional people and create a fun, diverse, supportive, and informal environment that allows everyone to do their best work.
What Matters to Us
Living our core values is essential to maintaining a work environment that is high-performing, inclusive, and collaborative. We look for candidates who demonstrate strong values alignment and bring different backgrounds, viewpoints, and abilities to the team.
Arcellx Core Values
• Start with authenticity: We foster an inclusive environment where each person can bring their authentic self to work.
• Think ‘we’ before ‘me’: We prioritize collective success, collaborating and supporting one another to achieve our shared goals.
• Embrace the challenge: We deliver exceptional results by working with shared determination and a commitment to doing what’s right.
The “Fine Print” – What You’ll Do
• Evaluate and implement advanced statistical methods (e.g., Bayesian adaptive designs for dose escalation, meta-analysis, causal inference for observational data, or handling missing data in longitudinal studies).
• Develop robust simulation frameworks to evaluate the operating characteristics of novel trial designs compared to traditional methods.
• Build, validate, and document R packages or Shiny applications that standardize complex analyses.
• This might include creating automated workflows for safety monitoring or efficacy visualization that can be used across multiple study teams.
• Summarize findings in a technical report and present your work to the broader department at the conclusion of the internship.
Skills and Experience We Look For
• Completion of at least 2 years of graduate studies in Biostatistics, Statistics, or a closely related quantitative field.
• Advanced skills in R (including Tidyverse and package development) or SAS. Experience with Python or Stan/JAGS is a plus.
• Strong understanding of Bayesian analysis, survival analysis, linear mixed models, and experimental design.
• Demonstrated ability to synthesize complex statistical findings into clear, actionable insights for non-quantitative stakeholders.
Join us in our quest to reimagine cell therapy and destroy cancer. For more on our technology, culture, and team, go to www.arcellx.com.
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