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Principal Scientist, Process Engineering


Job Location:

Moreton - UK

Monthly Salary: Not provided by the employer
Posted: 1 October 2026 (Yesterday)
Application Deadline: 29 December 2026
Vacancies: 1 Vacancy

Job Summary

At Bristol Myers Squibb our employees often ask Who are you working fora question that fuels collaboration accountability and urgency in our work. Our purpose-driven culture inspires us to discover develop and deliver innovative medicines to prevail over serious diseases. We offer uniquely interesting and meaningful work opportunities for growth and a supportive environment that values inclusion wellbeing flexibility and comprehensive benefits. This is work that transforms the lives of patients and the careers of those who do it.



Your work will reach patients. Lets talk about how.

Every medicine that makes it to a patient starts as a complex chemistry problem. Someone has to take a process that works seamlessly in a lab flask and make it work safely reliably and at scale - in a manufacturing facility.

That someone could be you.

At Bristol Myers Squibb were looking for a Process Engineer to join our Chemical Process Development (CPD) team in Moreton UK. CPD delivers clinical supplies and process development for all synthetic and anti-body drug conjugate (ADC) drug substances at BMS. This is a role where your engineering depth and your interpersonal skills will directly shape how - and how quickly - our clinical work reaches the patients who need them.

So what does the role actually look like day-to-day

Youll sit at the dynamic intersection between our internal science teams and the external Contract Development and Manufacturing Organisations (CDMOs) who bring our processes to life at scale.

On any given week you might be:

  • Reviewing a batch record for a hazardous chemistry campaign making sure everything from safety and quality controls to process intent is technically accurate and operationally feasible before it goes near a plant
  • Walking a CDMO facility either virtually or in person assessing whether their equipment and capabilities are the right fit and if not articulating exactly why and what needs to change
  • Troubleshooting a manufacturing issue drawing on your engineering fundamentals and collaboration skillset to find the root cause and get things back on track
  • Presenting risk assessments and recommendations to leadership translating complex technical realities into clear actionable decisions
  • Building strong relationships with CDMO partners across the world to improve how we work together and so that when things get difficult (and sometimes they will) you already have the trust in the room

Whats in it for you

Lets be direct about the real value this role offers you as a professional:

  • Youll work across the full range of chemical engineering unit operations reaction crystallisation distillation extraction filtration drying and milling applied to pharmaceutical small molecule/ADC scale-up.
  • Real influence across teams and organisations This role demands - and rewards - the ability to drive technical negotiations influence cross-functional teams and build trusted working relationships with external partners. For the right person this is where your interpersonal skills become as professionally valuable as your engineering ones.
  • A global role with a local base Youll be based at our Moreton UK site but working closely with colleagues across the Atlantic - including your direct line manager in the US and with CDMOs around the world. With up to 50% remote working available you get flexibility without losing the connection and collaboration that makes this kind of work rewarding.
  • Variety beyond the desk Up to 20% international travel means youll be on-site at CDMOs and in facilities.
  • A platform to grow and give back BMS actively values mentorship and knowledge-sharing. Whether its developing colleagues contributing to communities of practice or helping shape how the function works - this is a role where building others up is part of the job not an afterthought.

Is this you

  • Youll bring a . Chemical Engineering and at least 1015 years of industrial manufacturing experience - ideally in pharmaceutical drug substance manufacturing and GMP environments. Experience in specialty chemical or petrochemical industries is also acceptable.
  • You know how to read a lab protocol and visualise how it will operate in a manufacturing environment.
  • You can spot scale-up risk before it becomes a manufacturing incident.
  • You have a strong grounding in chemical engineering fundamentals across reaction crystallisation distillation extraction filtration drying and milling
  • But just as importantly: you communicate clearly you adapt your approach to the audience and the stakes and youre comfortable managing complexity across multiple workstreams and stakeholders at once.
  • Experience in lab-based small molecule development Useful but not essential.

Please note: This position requires work within facilities handling hazardous chemical agents which if improperly handled may have the potential to affect employee health including reproductive function and/or embryo/fetal development.

Why BMS why now

BMS is a company that has approved treatments that have genuinely changed whats possible in oncology immunology cardiovascular disease and beyond. Our pipeline continues to grow and the work of our Chemical Process Development team is central to keeping it moving.

When you get this right patients get their medicine sooner. Thats the job.

Ready to apply Wed love to hear from you.

#LI-Hybrid


We hire for skills and capabilities not just credentials if this role excites you but doesnt perfectly match your resume we encourage you to apply anyway.


How We Work

Where you work matters because collaboration innovation and patient impact happen in many settings. Our roles are structured across four work models: site-essential site-by-design field-based and remote-by-design. The model assigned to this role is based on its core responsibilities. Learn more at People with Disabilities

BMS is dedicated to ensuring that people with disabilities can excel through a transparent recruitment process reasonable workplaceaccommodations/adjustmentsand ongoing support in their roles. Applicants can request a reasonable workplaceaccommodation/adjustmentprior to accepting a job offer. If you require reasonableaccommodations/adjustmentsin completing this application or in any part of the recruitment process direct your inquiries to. Visit access our complete Equal Employment Opportunity statement.


Bristol Myers Squibb is Disability Confident Employer


A UK Government scheme


Candidate Rights

BMS will consider qualified applicants with arrest and conviction records pursuant to applicable laws in your area.


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R: Principal Scientist Process Engineering

Required Experience:

Staff IC


About Company

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Bristol-Myers Squibb is a global biopharmaceutical company focused on discovering, developing and delivering innovative medicines for patients with serious diseases. Our medicines are helping millions of patients around the world in disease areas such as oncology, cardiovascular, immu ... View more

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