Head of Science | Harwell, Oxfordshire | From £70,000 + Equity

This is the lead scientific seat in a highly-qualified technical team. You own the system energy ledger, the experimental programme, and the judgement calls that determine what we build next.

IONECH is a seed-stage energy hardware start-up based at Harwell, Oxfordshire. We're developing the Air Voltaic (AV) Cell, an energy-harvesting device that uses controlled interactions between electrons and oxygen in air to capture subtle natural differences in the environment, converting available exergy into electrical power. At scale, it sits at the base of the energy stack: a platform power source that reduces grid dependence across virtually every electrical use case.

We're a team working on a scientific world-first. We're closing the remaining questions and building prototypes that will disrupt every industry that uses electricity. This role exists to lead that transition from science to engineering.

We're looking for someone confident moving at pace through ambiguity. If you need full system understanding before you commit to a first experiment, this is not the role for you. You form working hypotheses fast, test them, and call it when the data lands.

The role

You will report to the Managing Director and work alongside the Head of Engineering. Engineering owns system design, integration, and build. You own the scientific programme: what gets tested, how it's validated, and when the evidence is sufficient to commit. You will lead a science team of four PhD physicists and chemists with more hires to follow, and you will spend most of your time in the laboratory, not at a desk.

System energy ledger

• Own and maintain the formal ledger, integrating modelling outputs, experimental data, and hardware constraints
• Keep science and engineering accountable to the same thermodynamic reality
• Flag anomalies early, with clear programme implications

Experimental direction

• Define the shortest credible path from current state to industrial prototype, with explicit success and failure criteria at every stage
• Ensure every experiment maps to a specific programme decision
• Design experiments that isolate variables and test system-level hypotheses, not only component performance
• Call time on avenues that are not earning their keep

Scientific validity

• Define what must be proven, what must be measured, and what constitutes sufficient evidence
• Hold the line against unsupported claims and invalid interpretations
• Retain sign-off on the scientific integrity of results, while deferring to engineering on hardware integration and build sequencing

Team leadership

• Lead and develop the science team with clear roles, ownership, and performance expectations
• Identify capability gaps and drive recruitment to close them
• Flourish in a culture of rigorous empiricism and intellectual honesty

Cross-disciplinary integration and communication

• Translate experimental findings into actionable inputs for engineering
• Contribute to system-level architecture reviews with scientific assessment of proposed directions
• Translate scientific progress into clear, defensible narratives for the MD, investors, and external partners
• Contribute to IP documentation, technical reports, and publications

What we're looking for

You'll need:

• A PhD in physics, engineering, materials science, electrochemistry, or a closely related discipline
• Demonstrated experience in systems modelling and system-level energy balance
• A track record of experimental design and hypothesis-driven hardware development
• Strong thermodynamic literacy
• Experience leading and developing small, multidisciplinary scientific teams
• Comfort making direction calls on incomplete data
• Highly organised, with brevity and precision in written and verbal communication.

You'll stand out if you have:

• Hands-on experience with electron field emission, cold cathode systems, or high-field environments
• Experience in electrochemistry, reactive oxygen species environments, or related surface and chemical systems
• Experience using AI tools to accelerate hardware development cycles, surface failure modes early, and maintain momentum without sacrificing rigour
• Experience taking hardware through TRL gates under real-world constraints, not solely research-grade demonstrations

What we offer

• Salary from £70,000, dependent on experience
• Equity through our ESOP scheme, so you share in what we're building
• Private medical healthcare for you and your family
• Company pension
• 25 days holiday plus bank holidays
• A well-equipped lab at the Harwell Science and Innovation Campus, a serious technical environment with the infrastructure to match the ambition
• Direct line to the MD and genuine influence over the scientific direction of the company

How to apply

Send your CV and a covering letter (one page maximum) explaining why this problem interests you and which parts of your experience are most relevant to the essential criteria.

We read every application. We don't use screening software.