Why pre-screen hydrogen fuel cell engineers before the technical panel
Two things separate this discipline. Stacks that look good in a short test degrade through mechanisms that only appear over thousands of hours, and hydrogen escapes through joints that hold every other gas, ignites at almost any mixture and burns with a flame you cannot see. Engineers worth hiring lead with both. A short screen asks what caused degradation in a stack they ran.
What actually matters when screening Hydrogen Fuel Cell Engineer candidates
- 01
Technical depth
Probe depth on PEM or SOFC stack behaviour: MEA and GDL selection, catalyst loading, polarisation curves, EIS, water and thermal management, humidifier and compressor balance of plant sizing.
- 02
Work that shipped
Ask what stacks or systems reached hardware: kW rating, duty cycle, hours on test, whether it entered a vehicle, backup power unit, or customer demonstrator.
- 03
Diagnosis under uncertainty
Test how they chased down cell voltage spread, membrane pinholes, contamination poisoning from CO or sulphur, freeze start failures, or unexplained stack degradation on the bench.
- 04
Working across the org
Check work with controls, hydrogen safety and leak detection reviews, supplier qualification of stacks or BoP parts, and compliance work against ISO 22734, SAE J2579, or ATEX zoning.
Pre-screening questions to ask Hydrogen Fuel Cell Engineer candidates
12 questions grouped by what they test. Ask the same set in every screen and score answers on a consistent scale, or send them as an async video screen and compare answers side by side.
Systems they ran
3 questions01Can you describe your experience with hydrogen fuel cell technology and systems?
Listen forSystems they built or tested with power output and run hours stated, not simulation work alone.
Experience limited to modelling, or systems described without power ratings or operating hours.
02Describe a project where you improved the performance or efficiency of a fuel cell.
Listen forA measured improvement with the mechanism explained, and the trade-off it introduced acknowledged.
Improvements quoted without measurement conditions, or gains that traded away durability silently.
03How do you approach the design and development of new fuel cell prototypes?
Listen forIteration through build and test, with design decisions changed by what the hardware actually did.
Designs finalised before testing, or prototypes built without a defined test programme.
Electrochemistry real
4 questions04Can you explain the electrochemical processes involved in hydrogen fuel cells?
Listen forLosses explained by mechanism across the polarisation curve, not recited as a textbook description.
Explanations at overview level, or the sources of voltage loss not distinguished.
05Have you worked with proton exchange membrane fuel cells, and what did that involve?
Listen forHands-on stack work, with water management and membrane hydration understood from experience.
Water management not mentioned, or flooding and drying never encountered in practice.
06Describe your experience with materials selection for fuel cell components.
Listen forCatalyst loading, bipolar plate corrosion and embrittlement all weighed against cost and life.
Materials chosen from supplier data alone, or hydrogen embrittlement not considered.
07What approaches do you use to optimise thermal management in these systems?
Listen forHeat removal designed alongside water management, with the interaction between them understood.
Thermal design treated separately from humidity, or cooling sized from peak power alone.
Hydrogen safety serious
3 questions08How do you ensure the safety and efficiency of hydrogen fuel cell systems?
Listen forLeak detection, ventilation and ignition control designed in, with invisible flame risk acknowledged.
Hydrogen handled like natural gas, or detection and ventilation treated as optional extras.
09How do you manage and mitigate the risks associated with hydrogen?
Listen forFormal hazard assessment with confined space accumulation and material compatibility both covered.
Risk assessed informally, or accumulation in enclosed spaces not treated as a primary hazard.
10What is your experience with standards and certification for hydrogen systems?
Listen forApplicable standards named with the testing they require, and certification worked through in practice.
Standards unfamiliar, or certification assumed to be a formality at the end of development.
Cost and durability
2 questions11How have you contributed to reducing the cost of fuel cell systems?
Listen forCost reduced at component level with the durability impact measured rather than assumed.
Cost cut by reducing catalyst or materials with no life testing to confirm the effect.
12Can you give an example of increasing the longevity or durability of a fuel cell system?
Listen forA degradation mechanism identified and addressed, with life demonstrated over meaningful run hours.
Durability claimed from short tests, or degradation mechanisms not identified specifically.
How to score responses
Score every candidate on the same four criteria immediately after the screen. At this stage you are shortlisting for panel interviews, not making the final call.
Technical depth
35%5Explains polarisation loss breakdown, cites specific membrane and catalyst choices, and links flooding or dry-out symptoms to measured cell voltage data.
Work that shipped
30%5Names shipped systems with power output, runtime hours, degradation rate per 1000 hours, and their own scope within the build.
Diagnosis under uncertainty
20%5Walks through a real failure using segmented cell data, teardown findings, or post-mortem MEA analysis before naming a root cause.
Working across the org
15%5Describes coordinating test rig safety cases, supplier design reviews, and controls handover with specific standards and named counterparts.
Stacks look good in a short test and degrade over thousands of hours. A one-way video screen asks what caused it.
Try it on HirevireScreening FAQ
Process basics
How long should a pre-screening round for this role take?
Fifteen minutes across eight to ten questions, answered async. Enough to establish systems they ran, test their electrochemistry depth, and check how seriously they take hydrogen safety.
How much test experience should I expect?
Substantial. Modelling a stack and running one on test for thousands of hours teach very different things, and the degradation mechanisms only show up in the second.
Evaluating answers
What is the strongest signal when screening this role?
The degradation mechanism in a stack they ran. Engineers with real test time name it specifically. Anyone quoting only peak performance has not run anything long enough to matter.
How do I judge their safety thinking?
Ask about leak detection and ventilation. Real answers cover invisible flames, wide flammability range and material embrittlement. Anyone treating hydrogen like natural gas is a hazard.
Go deeper on this role
Sanat has been hiring since 2012 and watching the recruitment industry change up close ever since, and turned that screening process into Hirevire's video screening platform. LinkedIn
