Merck Hiring Associate Principal Scientist, Discovery Oncology — South San Francisco, USA (2026) Full Time

Merck is hiring an Associate Principal Scientist for its Discovery Oncology team in South San Francisco, California. If you are a cancer biology researcher with a Ph.D. and several years of drug discovery experience, this could be a genuinely exciting opportunity — and one that comes with visa sponsorship and international relocation support, which is worth knowing about upfront.

This is not a remote role. You will be working on-site at Merck’s South San Francisco lab, leading early-stage oncology research programs from target validation through to early development. The team focuses on building the next generation of cancer therapies, and the position sits within one of the world’s most established pharmaceutical R&D organizations.

Below is a clear, source-verified breakdown of the role so you can decide whether it is worth applying.

Job overview

About Merck

Merck & Co., Inc. is one of the world’s largest pharmaceutical companies, headquartered in Rahway, New Jersey. Outside the United States and Canada, the company operates under the name MSD. Merck is publicly traded on the New York Stock Exchange (MRK) and is a member of the Dow 30.

The company is best known for developing KEYTRUDA (pembrolizumab), one of the most widely used cancer immunotherapies in the world. Merck invests billions of dollars annually in research and development and employs roughly 70,000 people globally. The South San Francisco site is a key hub for the company’s oncology discovery work, situated in one of the most important biotechnology clusters in the United States.

Merck has a well-documented history of sponsoring H-1B visas and other work authorization for qualified scientific professionals, which makes this listing particularly relevant for international researchers looking to build a career in the US pharmaceutical industry.

What this role involves

The Associate Principal Scientist will lead discovery-stage oncology research programs at Merck’s South San Francisco site. This is a hands-on scientific leadership position — not a purely administrative role. You will be expected to design experiments, analyze data, and make decisions that directly influence which therapeutic programs move forward.

Here is what the role specifically involves:

• Design, establish, and optimize in vitro and ex vivo assays to figure out how potential cancer drugs work and whether they are worth pursuing further.
• Make timely, data-driven decisions that balance innovation with experimental rigor — the kind of judgment calls that shape whether a program advances or gets shelved.
• Communicate scientific strategy and results clearly to internal teams, and help build an external scientific presence through publications, conference presentations, and collaborations.
• Drive early-stage discovery efforts to deliver competitive oncology programs, drawing on both internal expertise and emerging technologies in the field.

The position reports within the Discovery Oncology group and works cross-functionally with teams across Merck’s broader R&D organization. Travel requirements are minimal — roughly 10%.

Required skills and qualifications

Merck has outlined clear requirements for this position:

Education:

• Ph.D. in Cancer Biology, Cell Biology, Pharmacology, Immunology, Biochemistry, or a related discipline.

Required experience:

• Four or more years of relevant oncology drug discovery experience beyond the Ph.D.
• Deep expertise in tumor biology and immune oncology, including cancer genomics and oncogenic signaling pathways.
• Broad technical skills in molecular and cellular biology, biochemistry, and analytical methods.
• Extensive hands-on experience designing, executing, and analyzing multi-color flow cytometry and mechanistic cell-based assays — think viability and cytotoxicity assays, cell cycle analysis, signaling readouts, and immune response measurements.
• A demonstrated ability to drive innovative research, evidenced by high-impact publications, patents, or successful advancement of discovery programs.
• Strong oral and written communication skills, a collaborative mindset, and clear leadership potential.

Preferred (but not required):

• Hands-on experience with different therapeutic modalities — small molecules, monoclonal antibodies, antibody-drug conjugates (ADCs), and T-cell engagers (TCEs).
• Experience designing and analyzing in vivo mouse model data to evaluate potential therapeutics.

Salary, benefits, and relocation support

Merck states the annual base salary range for this role is USD 159,600 – 251,200. Where a candidate falls within that range depends on factors like relevant education, experience, skills, and geographic location. The successful candidate will also be eligible for an annual bonus and long-term incentive compensation, though specific figures for those components are not disclosed in the public posting.

Merck’s benefits package includes medical, dental, and vision coverage for employees and their families; a 401(k) retirement plan; paid holidays, vacation, and sick days; and a comprehensive well-being program. Full benefits details are available on Merck’s official compensation and benefits page.

Relocation support is explicitly offered for both domestic and international moves, which is a significant detail for anyone considering this role from outside the United States.

Work permit and visa note

This is where the listing stands out for international applicants: Merck explicitly states that visa sponsorship is available for this position. The posting reads “VISA Sponsorship: Yes” and “Relocation: Domestic/International.” This means Merck is prepared to support work authorization for a qualified candidate who requires it, and they are willing to assist with relocation from outside the US.

The specific visa category (H-1B, O-1, or another appropriate route) is not detailed in the posting and would be discussed with Merck’s immigration team during the hiring process. JobsRivo does not infer or guarantee any specific visa outcome — the information here reflects only what the employer has explicitly stated.

Who this role may suit

This position is likely a strong fit for experienced cancer researchers with a Ph.D. who have spent at least four years working in oncology drug discovery. You might be a senior postdoc in a cancer biology lab who is ready to move into industry, or a scientist at another pharmaceutical or biotech company who wants to join a larger R&D organization with deeper resources.

Given the visa sponsorship and international relocation on offer, this is also a realistic opportunity for researchers currently based outside the United States who have the right qualifications and are looking for a pathway into the US pharmaceutical industry. The South San Francisco location places you at the heart of one of the world’s most important biotech hubs.

How to apply officially

Applications are accepted only through Merck’s official careers website. Use the official link below — JobsRivo never collects applications, fees, or documents. If anyone contacts you claiming to be from JobsRivo and asks for payment, that is a scam.

Official application URL: https://jobs.merck.com/us/en/job/R399744/Associate-Principal-Scientist-Discovery-Oncology

The application deadline for this position is 11:59 PM on June 17, 2026 (the day before the listed posting end date of June 18, 2026). Interested candidates should apply promptly.

Required documents

Specific document requirements are not listed in the public posting. Merck’s application system typically requests a current CV or resume and basic profile details. Candidates should follow exactly what is requested on the official application page.

FAQs

Does Merck sponsor a visa for this position?

Yes. The listing explicitly states “VISA Sponsorship: Yes” and offers domestic and international relocation support. The specific visa category would be determined during the hiring process based on the candidate’s circumstances.

Is remote or hybrid work available?

No. Merck states that Flexible Work Arrangements are “Not Applicable” for this role. This is a fully on-site position at the South San Francisco site.

What is the published salary range?

Merck lists USD 159,600 – 251,200 as the annual base salary range. The final offer depends on education, experience, skills, and other individualized factors. Bonus and long-term incentive compensation are available in addition to base salary.

What is the application deadline?

The job posting end date is June 18, 2026. Merck notes that applications must be submitted by 11:59 PM on the day before the listed end date, so the effective deadline is 11:59 PM on June 17, 2026.

What qualifications do I need?

A Ph.D. in a relevant discipline (Cancer Biology, Cell Biology, Pharmacology, Immunology, Biochemistry, or similar) plus at least four years of oncology drug discovery experience. Hands-on expertise with flow cytometry and cell-based assays is essential.

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