Senior Biosensing Scientist; Surface Chemistry & Molecular Interfaces

We’re seeking a Senior Biosensing Scientist to join our founding R&D team. This role is responsible for building the biochemical layer of our platform: engineering the molecular interfaces that allow our novel photonic sensors to monitor biology in real-time. You will lead the design and validation of reversible biorecognition interfaces for continuous monitoring.

We’re a stealth, venture-backed healthtech building a next-generation wearable molecular sensing platform, leveraging novel light-based sensing in a wearable form factor.

Our mission is to turn the body’s molecular signals into a continuous source of truth - unlocking real‑time biochemical clarity for areas like fertility, inflammation, metabolic health, and recovery. Today’s wearables track proxies (heart rate, sleep, movement), but the biology that drives health still lives in episodic, invasive lab tests. We’re closing that gap.

We are seeking a Senior Biosensing Scientist to play a foundational role in designing and validating the biorecognition interfaces at the heart of our sensing platform.

This role focuses on engineering aptamer‑based, surface‑functionalised molecular probes that can selectively capture target biomarkers and release them in a controlled, reversible manner – enabling uninterrupted long‑term monitoring. Your work will directly determine sensor stability, specificity, regeneration performance, and real‑world usability. You’ll work at the intersection of surface chemistry, molecular biology, and biosensing, collaborating closely with our photonics, microfluidics, and systems teams to translate molecular design into robust continuous sensing hardware.

• Affinity Probe Engineering: Design and development of surface‑immobilised molecular probes (specifically nucleic‑acid based) and synthetic ligands.
• Continuous Sensing Logic: Engineering reversible capture‑release mechanisms to enable uninterrupted monitoring without signal degradation.
• Surface Architecture: Optimising linker chemistry and immobilisation techniques to ensure maximum signal transduction on proprietary optical surfaces.
• Dynamic Validation: Characterising probe behaviour and kinetics in complex biological media and simulated wear environments.
• Experimental Leadership: Using advanced tools (e.g., QCM, optical readouts) to establish the performance limits of our biorecognition layer.

You’ll collaborate closely with leaders across photonics, microfluidics, clinical, and product and play a key role in bringing a genuinely cutting‑edge wearable technology from first prototypes to pilot‑ready systems.

• PhD (or MSc + 3+ years) in Chemistry, Biochemistry, or Bioengineering or related.
• Proven, hands‑on experience working with aptamers (or closely related nucleic‑acid affinity probes) in a biosensing / affinity‑capture context – including assay development and performance optimisation.
• Strong background in surface chemistry and biomolecule/protein immobilisation.
• Demonstrated experience designing controlled capture and release / regeneration strategies suitable for repeated or continuous sensing.
• Experience with fluorescence and/or absorbance‑based characterisation techniques.
• Proficiency with PCR‑based workflows where relevant to biomarker/assay validation.

• Development of custom aptamers or nucleic‑acid–based probes (e.g., optimisation, truncations/modifications, or SELEX exposure).
• Design of novel synthetic affinity ligands.
• Hands‑on experience with QCM analysis (or related kinetics tools).
• Familiarity with continuous or real‑time biosensing platforms.
• Experience working with microfluidic, wearable, or lab‑on‑chip systems.
• Experience validating biomarkers in interstitial fluid (ISF).
• Experience handling skin tissue samples.

• Foundational ownership: You’ll be a core contributor to the chemistry and biorecognition layer of the platform, directly shaping sensor performance, biomarker selection, and long‑term reliability. Your work will define what we can measure and how well we can measure it.
• Deep‑tech, real‑world impact: Work on genuinely novel…