Pre-Screening Interview Questions to Ask a Hardware Security Engineer

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Sanat Hegde
Sanat Hegde · Founder, Hirevire
Founder of Hirevire, screening software used by 500+ companies

Hardware attacks assume physical access, which changes what a defence has to survive. These questions separate engineers who have tested a device from those who apply network security thinking to silicon.

TL;DR, what to screen for

The best pre-screening questions for a hardware security engineer test four things: devices they secured or attacked rather than reviewed, whether their threat model assumes an adversary holding the hardware, whether they understand what secure elements actually protect, and how they responded when a device was compromised. Ask what they got out of a device.

  • Devices they tested
  • Physical adversary
  • What modules protect
  • Responding to compromise

Why pre-screen hardware security engineers before the technical panel

The threat model here is different from everything else in security: the attacker owns the device, has unlimited time and can open it. That invalidates most software assumptions, because a debug port, an unencrypted flash chip or a signal on a test pad is enough. Engineers worth hiring have actually extracted something from a device and can describe how. A short screen asks that, because reading about hardware attacks produces a very different answer.

What actually matters when screening Hardware Security Engineer candidates

  1. 01

    Technical depth

    Probe depth on silicon attack surface: differential power analysis with ChipWhisperer or Riscure, voltage and EMFI glitching, JTAG/SWD lockdown, eFuse and OTP handling, secure boot chains, TrustZone isolation.

  2. 02

    Real incidents and findings

    Ask for real findings on shipped silicon or boards: bypassed debug locks, key extraction from an HSM or TPM, ROM bootloader bugs, CVE or advisory numbers they authored.

  3. 03

    Risk judgement

    Test how they rank threats against attacker cost: remote versus physical access, tamper-evident versus tamper-resistant choices, CVSS or SESIP scoring, and what they deliberately left unmitigated.

  4. 04

    Getting things fixed

    Check how fixes reached tape-out or production: threat models reviewed with ASIC and firmware teams, ROM patch requests, secure provisioning changes, Common Criteria or FIPS 140-3 evidence packages.

Pre-screening questions to ask Hardware Security 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.

Devices they tested

3 questions

  1. 01What is your experience with hardware security?

    Listen for

    Device classes named with hands-on work, distinguishing design work from testing and attacking hardware.

    Experience that is network security applied to devices, or no hardware they have physically worked on.

  2. 02Do you have experience designing and implementing hardware security solutions?

    Listen for

    Secure boot, key storage and debug interface handling designed into a product that shipped.

    Security added after the hardware design was fixed, or debug interfaces left enabled in production.

  3. 03Do you have experience developing hardware security protocols and procedures?

    Listen for

    Provisioning and key management handled through the manufacturing process, not only in the design.

    Key provisioning left to manufacturing with no controls, or the same key across a product line.

Physical adversary

3 questions

  1. 04Can you explain a situation where you identified and mitigated a hardware security risk?

    Listen for

    A specific finding from testing a device, with the fix and whether it could be applied to units already shipped.

    Risks identified from documentation review only, or findings with no remediation that reached devices.

  2. 05Can you describe your experience with vulnerability and threat assessment?

    Listen for

    A threat model that assumes physical possession, covering extraction, fault injection and side channels.

    Threat modelling that stops at network access, or physical attacks dismissed as impractical.

  3. 06Can you explain how you would conduct a hardware risk assessment?

    Listen for

    Attack surface enumerated across interfaces, storage and supply chain, with likely attacker capability stated.

    Assessment performed against a checklist, or supply chain never considered as an attack path.

What modules protect

2 questions

  1. 07Can you explain how hardware security modules and trusted platform modules work?

    Listen for

    A clear account of what they protect and what they do not, including a compromised host requesting operations.

    These modules described as making a system secure, or their limits not understood.

  2. 08How familiar are you with cryptographic systems and protocols?

    Listen for

    Enough depth to judge an implementation, including key lifecycle and where entropy comes from on a device.

    Cryptography treated as library selection, or no awareness of entropy problems on embedded hardware.

Responding to compromise

4 questions

  1. 09Have you had to respond to a hardware security breach? How did you handle it?

    Listen for

    A real incident with the fleet impact assessed, and whether a fix could be delivered to devices in the field.

    No incident experience, or no consideration of devices that cannot be updated remotely.

  2. 10How would you handle an incident where hardware security was compromised?

    Listen for

    Scope established first, keys treated as compromised, and a route to revoke or replace what was exposed.

    Devices patched with no key rotation, or no plan for hardware that cannot be recovered.

  3. 11Can you describe a time when you implemented a hardware security improvement?

    Listen for

    A specific improvement with the risk it closed, and what it cost in manufacturing or performance.

    Improvements described with no cost, or recommendations never implemented in a shipping product.

  4. 12What strategies would you use to enforce hardware security policies?

    Listen for

    Requirements built into design review and manufacturing test, so compliance is verified rather than asserted.

    Policies published with no verification, or enforcement that depends on engineers remembering.

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.

  1. Technical depth

    35%

    5Names specific trace counts, glitch parameters and countermeasures such as masking or redundant boot checks, and explains why each defeats a given attack.

  2. Real incidents and findings

    30%

    5Walks through a concrete break end to end, from decapsulation or bus probing to the extracted asset, with the vendor fix that followed.

  3. Risk judgement

    20%

    5Ties each risk to attacker budget and equipment tier, and defends accepting a residual risk with cost, yield or schedule reasoning.

  4. Getting things fixed

    15%

    5Cites mitigations that survived silicon respin or certification review, and describes how they persuaded design teams to absorb the area or power cost.

Here the attacker owns the device, has unlimited time and can open it, which invalidates most software assumptions. A one-way video screen asks what they extracted.

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Screening 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 what devices they worked on, test their threat model, and hear one real finding or incident.

Can a network security engineer move into this role?

Some can, and the threat model has to be relearned. Ask what changes when the attacker holds the device. A candidate who has thought about it will name physical access immediately; one who has not will describe network controls.

Evaluating answers

What is the strongest signal when screening this role?

Something they extracted from a device. Engineers with hands-on experience describe a debug interface, a flash dump or a side channel. Anyone whose knowledge is entirely conceptual has not tested hardware.

How do I judge their understanding of secure elements?

Ask what a hardware security module actually protects against. Real answers cover key extraction and are clear that it does nothing about a compromised host asking it to sign things. Overstating that is a common error.

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Sanat Hegde
Sanat Hegde
Founder, Hirevire

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

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