Why pre-screen secure software developers before the technical interview
Every developer says they write secure code. The distinguishing question is whether they have found a vulnerability in something they built themselves, because that requires both the knowledge to spot it and the willingness to look. Add threat modelling at design stage, where fixes are cheap, and you have the two things that separate this role from a developer who runs a scanner. A short screen asks for both.
What actually matters when screening Secure Software Developer candidates
- 01
Technical proficiency
Check fluency in secure coding for their stack: parameterised queries, output encoding, OAuth2/OIDC flows, key handling via KMS or Vault, and fixes for OWASP Top 10 classes.
- 02
Systems and trade-offs
Probe threat modelling on a real feature: STRIDE or attack trees, trust boundaries drawn, and where they accepted friction such as mTLS, tokenisation, or stricter session expiry.
- 03
Evidence and rigour
Assess how they verify security claims: SAST/DAST tuning, dependency scanning and SBOM handling, fuzzing, unit tests for authz logic, and triage of false positives.
- 04
Collaboration and communication
Look for how they land fixes with feature teams: writing secure code review guidance, pairing on remediation, and pushing back on a risky pull request without stalling the release.
Pre-screening questions to ask Secure Software Developer 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.
Vulnerabilities they fixed
3 questions01Describe a time when you identified and resolved a security vulnerability in a project.
Listen forA specific vulnerability with how it was found, ideally in code they wrote themselves rather than inherited.
Only vulnerabilities found by scanners or by other people, with no personal discovery described.
02Can you describe a project where you applied secure development principles?
Listen forSecurity decisions made during design with the trade-offs described, not controls added before release.
Security applied as a checklist at the end, or decisions made without any consideration of usability.
03In what ways have you improved the security of software you have developed?
Listen forConcrete improvements with the risk they removed, and evidence the change was adopted across the codebase.
Improvements described as awareness, or changes that were never applied beyond one component.
Threat modelling early
4 questions04Do you have experience with threat modelling and secure design?
Listen forThreat modelling done at design stage with the team, producing decisions rather than a document.
Threat modelling described in theory, or exercises that never changed anything in the design.
05What secure coding practices are you familiar with?
Listen forInput validation, output encoding and least privilege described as defaults in the languages they use.
Practices recited generically, or no framework-specific knowledge of where the common holes appear.
06What vulnerability mitigation techniques are you familiar with?
Listen forMitigations chosen for the specific class of flaw, with defence in depth rather than a single control.
One mitigation offered for every problem, or reliance on a web application firewall as the answer.
07How do you integrate security into the software development lifecycle?
Listen forSecurity checks in the pipeline with results triaged, so findings are acted on rather than accumulated.
Scanning added to a pipeline with nobody reading it, or findings queued indefinitely as technical debt.
Testing beyond scans
2 questions08What steps do you take to test software for security vulnerabilities?
Listen forManual review alongside tooling, with abuse cases tested rather than only expected behaviour.
Testing limited to scanner output, or no manual verification of automated findings.
09Do you have experience with static and dynamic analysis tools?
Listen forTools tuned to reduce noise, with an honest view of what each catches and what it will always miss.
Tool output treated as complete coverage, or false positive rates so high the results are ignored.
Cryptography used properly
3 questions10Do you have experience with cryptographic algorithms and their use?
Listen forEstablished libraries used correctly, with key management treated as the genuinely difficult problem.
Custom cryptographic schemes, or algorithms chosen without understanding their mode of operation.
11How do you handle encryption and decryption in the software you develop?
Listen forKey storage, rotation and access described concretely, with secrets kept out of code and configuration.
Keys stored alongside the data they protect, or secrets committed into a repository.
12How do you ensure secure data transmission in your software?
Listen forTransport security applied everywhere including internal traffic, with certificate validation not disabled.
Internal traffic assumed trusted, or certificate checks turned off to make something work.
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 proficiency
35%5Names specific vulnerability classes they have remediated in code, with the exact library, framework control, or crypto primitive used.
Systems and trade-offs
25%5Walks through a design decision balancing latency, developer velocity, and blast radius, explaining what attack they deliberately designed out.
Evidence and rigour
25%5Cites measured outcomes such as reduced critical findings, pipeline gate pass rates, or CVEs caught before release, not tool names alone.
Collaboration and communication
15%5Describes convincing reluctant engineers with a proof of concept exploit or reusable secure component rather than a policy citation.
Everyone says they write secure code; few have found a hole in their own. A one-way video screen asks for one.
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 vulnerabilities they fixed, test their design-stage thinking, and check how they use cryptography.
How does this differ from a security engineer screen?
This role writes the software rather than testing someone else's. Weight secure design, code-level habits and understanding of the frameworks in use over offensive tooling and penetration testing.
Evaluating answers
What is the strongest signal when screening this role?
A vulnerability in their own code. Developers with real security depth have found and fixed one and will say so. Anyone whose examples are all other people's mistakes has not looked at their own.
How do I judge their cryptography knowledge?
Ask how they handle encryption. The answer you want uses established libraries and treats key management as the hard part. Anyone describing a custom scheme is a serious risk.
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
