Talentmark
Senior Scientist, Assay Development

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Senior Scientist – Assay Development
On-site | London/Stevenage | Permanent
Talentmark is working with an innovative, early-stage diagnostics company developing next-generation at-home testing technology.
We are looking for a Senior Scientist – Assay Development to take ownership of assay development and help shape the company's scientific direction. This is a hands-on leadership role, taking assays from initial design and optimisation through to validation and commercialisation.
Key Responsibilities
- Lead the design and development of quantitative immunoassays.
- Drive optimisation of sensitivity, precision, reproducibility and stability.
- Design and execute assay development and validation studies.
- Maintain robust documentation aligned with regulatory and technical-file requirements.
- Establish high standards for data integrity, experimental rigour and statistical analysis.
- Manage external scientific collaborators and advisors.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.
Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
Your Background
You are an experienced assay development scientist with a strong track record of taking assays from concept through to validation.
Essential Experience
- PhD in Biochemistry, Analytical Chemistry, Bioengineering, Biomedical Science or a related discipline.
- Industry experience in diagnostics or assay development (5 yrs+)
- Strong hands-on expertise in immunoassay development, particularly ELISA, with a good working knowledge of enzymatic assays.
- Experience translating laboratory immunoassays into point-of-care, lateral-flow, biosensor or microfluidic cartridge formats.
- Experience with low-concentration analyte measurement
- Proven experience developing diagnostic assays through validation and commercial release.
- Practical experience working with human biological samples (blood, saliva or urine).


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Desirable Experience
- Experience developing steroid or peptide hormone assays.
- Familiarity with freeze-drying / lyophilisation for reagent stabilisation.
- Knowledge IVD technical-file preparation for CE, UKCA or FDA submissions.
- Experience building or leading a laboratory/science team.
- Experience working with aptamer technology.
What's on Offer
- The opportunity to take diagnostic assays from concept through validation and towards market.
- A senior, hands-on role within an ambitious early-stage company.
- Competitive salary and share equity options scheme.
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It is essential that applicants hold entitlement to work in the UK. Please quote job reference 199 429 in all correspondence.
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