Why pre-screen post-quantum cryptography architects before the technical panel
The reason this work is urgent has nothing to do with when a capable quantum computer arrives. Encrypted traffic captured now can be stored and decrypted later, so anything with a long confidentiality life is already exposed. Architects worth hiring understand that, have inventoried where cryptography actually sits in a system, and have migrated something. A short screen asks what they migrated and what it cost in performance.
What actually matters when screening Post-Quantum Cryptography Architect candidates
- 01
Theoretical command
Probe command of lattice and hash-based hardness assumptions: Module-LWE parameter choices in ML-KEM, ML-DSA versus SLH-DSA trade-offs, and why SIKE and Rainbow fell.
- 02
From theory to hardware or code
Ask what they built: hybrid X25519MLKEM768 key exchange in TLS 1.3, liboqs or BoringSSL integrations, HSM and PKI certificate profiles, constant-time implementations.
- 03
Research judgement
Assess how they sequence a migration: cryptographic inventory and CBOM production, harvest-now-decrypt-later exposure ranking, crypto-agility abstractions, and when to wait for standards rather than deploy.
- 04
Explaining it to non-specialists
Look for evidence they briefed boards, auditors or product teams: quantum risk timelines without hype, CNSA 2.0 mandates, budget and vendor readiness conversations.
Pre-screening questions to ask Post-Quantum Cryptography Architect 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.
Implementations shipped
3 questions01What experience do you have implementing quantum-resistant cryptography in real applications?
Listen forSomething deployed and running in production, with the integration difficulties described specifically.
Experience limited to reading standards, or implementations that never left a test environment.
02Can you discuss post-quantum cryptographic projects you have worked on?
Listen forProjects with their own scope stated, distinguishing library integration from actual protocol design.
Projects described at an organisational level, or no personal technical contribution.
03What difficulties have you faced implementing these systems?
Listen forConcrete problems such as key sizes breaking message limits or handshake latency increasing.
Difficulties described as organisational, or no awareness of the practical cost of larger keys.
Algorithm judgement
4 questions04Explain lattice-based cryptography and why it matters in this context.
Listen forA clear explanation of the hardness assumption and its limits, without overclaiming security proofs.
Explanation recited from summaries, or the assumption treated as proven security.
05What key exchange mechanisms would you recommend, and why?
Listen forStandardised choices recommended with the performance trade-off stated for the deployment context.
Non-standardised schemes recommended for production, or recommendations with no context.
06How do you evaluate the performance and security of these algorithms?
Listen forBenchmarking on the target hardware, with handshake size and latency measured rather than cited.
Performance quoted from papers, or constrained device behaviour never tested.
07What is your view of the standardisation process in this field?
Listen forStandardisation followed closely, with an understanding of why some candidate schemes were withdrawn.
Standards treated as settled, or no awareness that candidate schemes have been broken.
Migration planned
3 questions08How would you approach migrating an existing system to quantum-resistant cryptography?
Listen forInventory first, prioritised by data confidentiality lifetime, with crypto agility built in for the next change.
Migration described as swapping algorithms, or no inventory step before planning.
09What are your thoughts on hybrid schemes combining classical and post-quantum algorithms?
Listen forHybrid treated as the sensible transition, with the reasoning about hedging both risks explained.
Hybrid dismissed as unnecessary complexity, or a wholesale switch recommended immediately.
10How have you addressed key management in a post-quantum context?
Listen forLarger keys accounted for in storage, hardware modules and protocol limits, with rotation planned.
Key management treated as unchanged, or hardware constraints not considered.
Risk explained
2 questions11Can you provide an example of a threat model for a system using this cryptography?
Listen forA threat model that includes capture now and decrypt later, with data lifetime driving priority.
Threat models that assume attacks only happen when quantum computers exist.
12How would you describe the impact of this transition to a non-technical executive?
Listen forThe timeline explained through data confidentiality lifetime rather than predictions about hardware.
Urgency created with speculative dates, or the risk explained in cryptographic terminology.
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.
Theoretical command
35%5Explains FIPS 203/204/205 parameter sets and security categories precisely, and cites concrete cryptanalytic results behind algorithm selection.
From theory to hardware or code
30%5Names shipped deployments with measured handshake latency and packet size impact, plus side-channel hardening they verified rather than assumed.
Research judgement
20%5Prioritises long-lived secrets and firmware signing roots with clear reasoning, and states which decisions they deliberately deferred.
Explaining it to non-specialists
15%5Translates lattice mathematics into concrete business exposure and dates, and has changed executive or supplier behaviour as a result.
Traffic captured today can be decrypted later, so long-lived secrets are already exposed. A one-way video screen asks what they migrated.
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 what they implemented, test algorithm judgement, and hear how they would plan a migration.
Should I expect production experience in this area?
Some, but the field is young. What matters more is applied cryptography depth and a realistic migration plan, rather than years spent with any particular algorithm family.
Evaluating answers
What is the strongest signal when screening this role?
A migration they planned or executed, with the inventory work described. Architects who have done it know cryptography hides in libraries, hardware and third parties nobody listed.
What should worry me in an answer?
Recommending a wholesale switch with no hybrid period, or dismissing performance cost. Both suggest someone who has not deployed these algorithms into a system with real latency budgets.
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
