Sr Associate Scientist, Biology

At Gilead, we’re creating a healthier world for all people. For more than 35 years, we’ve tackled diseases such as HIV, viral hepatitis, COVID-19 and cancer – working relentlessly to develop therapies that help improve lives and to ensure access to these therapies across the globe. We continue to fight against the world’s biggest health challenges, and our mission requires collaboration, determination and a relentless drive to make a difference.

Every member of Gilead’s team plays a critical role in the discovery and development of life-changing scientific innovations. Our employees are our greatest asset as we work to achieve our bold ambitions, and we’re looking for the next wave of passionate and ambitious people ready to make a direct impact.

We believe every employee deserves a great leader. People Leaders are the cornerstone to the employee experience at Gilead and Kite. As a people leader now or in the future, you are the key driver in evolving our culture and creating an environment where every employee feels included, developed and empowered to fulfil their aspirations. Join Gilead and help create possible, together.

Job Description

At Gilead our pursuit of a healthier world for all people has yielded a cure for hepatitis C, revolutionary improvements in HIV treatment and prevention as well as advancements in therapies for viral and inflammatory diseases and certain cancers.

We set and achieve bold ambitions in our fight against the world’s most devastating diseases, united in our commitment to confronting the largest public health challenges of our day and improving the lives of patients for generations to come.

We are seeking a skilled Sr. Associate Scientist to support pharmacokinetic (PK) bioanalysis of large molecules across discovery and early development programs. This individual will play a key role in independently developing, executing, and troubleshooting high throughput bioanalytical assays, while collaborating closely with cross-functional teams to deliver high-quality data that informs critical project decisions. The ideal candidate thrives in a fast-paced, results-driven environment, demonstrates strong scientific ownership, and is eager to expand their impact beyond core bioanalysis into broader drug discovery efforts.

As an Associate Scientist- Biology , at Gilead you will ...

Key Responsibilities

• Design, develop, and execute bioanalytical assays for large molecules and ADC
• Perform ligand-binding assays (LBA) such as ELISA and MSD in different biological matrices to support PK studies
• Independently analyze and interpret experimental data, and ensure data quality and integrity
• Independently troubleshoot assay performance issues and implement effective solutions
• Manage PK sample analysis workflows across multiple studies
• Collaborate with DMPK, biology, and project teams
• Prepare presentations and written reports
• Maintain accurate documentation
• Contribute to automation and workflow improvements
• Support broader discovery and screening activities

Required Qualifications

• BS with 5+ years or MS with 3+ years in Pharmaceutical Science, Biochemistry, Biology or related discipline.
• 2–3 years of industry experience in PK bioanalysis, DMPK, or related field
• Hands-on experience independently supporting and executing in vivo PK studies for large molecules (e.g., monoclonal antibodies, peptides, biologics)
• Expertise in ligand-binding assays (ELISA, MSD, Gyrolab), including assay development, optimization, and troubleshooting
• Broad knowledge of PK bioanalytical assays, including ADA
• Demonstrated ability to analyze and interpret PK data, including curve fitting (4PL/5PL), QC evaluation, and trend analysis
• Strong understanding of PK/ADME principles for biologics (AUC, clearance, half-life, TMDD, nonlinear PK)
• Working knowledge of antibody-drug conjugates (ADCs) and their bioanalytical challenges
• Proven ability to design experiments and troubleshoot independently
• Experience working with biological matrices (serum, plasma, tissue)
• Ability to manage multiple studies and timelines
• Strong communication and presentation skills

Preferred Qualifications

• Experience with LC-MS/MS
• Experience with in vitro high throughput screening technologies
• Familiarity with HTS (96/384/1536-well formats) and laboratory automation

The salary range for this position is: $126,820.00 - $164,120.00. Gilead considers a variety of factors when determining base compensation, including experience, qualifications, and geographic location. These considerations mean actual compensation will vary. This position may also be eligible for a discretionary annual bonus, discretionary stock-based long-term incentives (eligibility may vary based on role), paid time off, and a benefits package. Benefits include company-sponsored medical, dental, vision, and life insurance plans*.

For Additional Benefits Information, Visit

https://www.gilead.com/careers/compensation-benefits-and-we