Principal Scientist

Site Name: UK - Hertfordshire - Stevenage

Posted Date: Jan 22 2026

We create a place where people can grow, be their best, be safe, and feel welcome, valued and included. We offer a competitive salary, an annual bonus based on company performance, healthcare and wellbeing programmes, pension plan membership, and shares and savings programme.

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At GSK, we have bold ambitions for patients, aiming to positively impact the health of 2.5 billion people by the end of the decade. Our R&D focuses on discovering and delivering vaccines and medicines, combining our understanding of the immune system with cutting-edge technology to transform people’s lives. GSK fosters a culture ambitious for patients, accountable for impact, and committed to doing the right thing, making sure that we focus our efforts on accelerating significant assets that meet patients’ needs and have the highest probability of success. We’re uniting science, technology, and talent to get ahead of disease together.

Principal Scientist

As a Principal Scientist you will lead scientific work that helps teams make faster, better decisions. You will design, validate and execute experiments that support both early and late clinical studies. You will work closely with project teams, laboratory colleagues and external partners. We value clear thinkers who share knowledge, care about quality, and enjoy mentoring others. This role offers strong opportunities to grow your technical and leadership skills while contributing to GSK’s mission of uniting science, technology and talent to get ahead of disease together.

This role will provide YOU the opportunity to lead key activities to progress YOUR career. These responsibilities include some of the following:

• Design, develop and validate robust spectral flow cytometry biomarker assays to support early and late clinical studies.

Strong data analysis skills and clear written and verbal communication for scientific audiences.

Experience working with human biological samples and understanding of relevant safety and ethical requirements.

Ability to manage multiple projects, prioritise tasks and meet deadlines in a collaborative team environment.

Preferred Qualifications & Skills:

Please note the following skills are not necessary, just preferred, if you do not have them, please still apply:

• PhD in a relevant scientific discipline.
• Practical experience with specific platforms such as the Cytek Aurora flow cytometer and OMIQ analysis software.
• Significant and demonstrable experience with computational approaches to high dimensional data analysis.
• Experience with both laboratory and analytical automation.
• Experience of assay validation, working within GCP or other regulated environments and familiarity with relevant regulatory expectations.
• Demonstrated ability to influence cross-functional teams and provide scientific leadership on projects.
  
  
  

Please take a copy of the Job Description, as this will not be available post closure of the advert.

Closing Date for Applications – 6th February 2026

When applying for this role, please use the ‘cover letter’ of the online application or your CV to describe how you meet the competencies for this role, as outlined in the job requirements above. The information that you have provided in your cover letter and CV will be used to assess your application.

At GSK, we have bold ambitions for patients, aiming to positively impact the health of 2.5 billion people by the end of the decade. Our R&D focuses on discovering and delivering vaccines and medicines, combining our understanding of the immune system with cutting-edge technology to transform people’s lives. GSK fosters a culture ambitious for patients, accountable for impact, and committed to doing the right thing, making sure that we focus our efforts on accelerating significant assets that meet patients’ needs and have the highest probability of success. We’re uniting science, technology, and talent to get ahead of disease together.

Find out more:

Our approach to R&D.   

Why GSK?

Uniting science, technology and talent to get ahead of disease together.

GSK is a global biopharma company with a purpose to unite science, technology and talent to get ahead of disease together. We aim to positively impact the health of 2.5 billion people by the end of the decade, as a successful, growing company where people can thrive.

We get ahead of disease by preventing and treating it with innovation in

specialty medicines and vaccines. We focus on four therapeutic areas: respiratory, immunology and inflammation; oncology; HIV; and infectious diseases – to impact health at scale.

People and patients around the world count on the medicines and vaccines we make, so we’re committed to creating an environment where our people can thrive and focus on what matters most. Our culture of being ambitious for patients, accountable for impact and doing the right thing is the foundation for how, together, we deliver for patients, shareholders and our people.

GSK is an Equal Opportunity Employer. This ensures that all qualified applicants will receive equal consideration for employment without regard to race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), parental status, national origin, age, disability, genetic information (including family medical history), military service or any basis prohibited under federal, state or local law.

We believe in an agile working culture for all our roles. If flexibility is important to you, we encourage you to explore with our hiring team what the opportunities are.

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Please note should your enquiry not relate to adjustments, we will not be able to support you through these channels. However, we have created a Recruitment FAQ guide. Click the Link where you will find answers to multiple questions we receive

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