Application Security Engineer Interview Questions UK: 8 Real Questions and What Interviewers Want

Before your Application Security Engineer interview, it helps to see the questions from the interviewer's side. We have picked eight from our set of 16 and added the reason each one gets asked.

Eight Application Security Engineer interview questions, and what the interviewer is thinking

1. How would you embed security into a software development lifecycle, from design to release?

Why they ask: The core of the AppSec role is shifting security left without blocking delivery.

2. Explain broken access control and IDOR, how you would test for them, and how developers should prevent them.

Why they ask: Broken access control is OWASP's top category, so they expect depth.

3. What is the difference between SAST, DAST, IAST and SCA, and what are the limitations of each?

Why they ask: Tooling choices are central to an AppSec engineer's work.

4. What does a typical day look like for an Application Security Engineer?

Why they ask: They check understanding of the blend of engineering, review and advocacy.

5. How do you secure APIs, and what are the main risks in the OWASP API Security Top 10?

Why they ask: APIs are now a dominant attack surface and a core AppSec topic.

6. How does cross-site request forgery work, and how do modern frameworks and browsers mitigate it?

Why they ask: They test understanding of web session security and defence layers.

7. A developer disagrees with your SAST finding and says it is a false positive. How do you handle it?

Why they ask: AppSec relies on working relationships with developers and sound technical judgement.

8. Tell me about a time you found a significant application vulnerability and got it fixed.

Why they ask: They want evidence of both technical skill and the ability to drive remediation.

A sample answer to question 1

How would you embed security into a software development lifecycle, from design to release?

I'd begin at design with lightweight threat modelling, using STRIDE, for features that touch authentication, sensitive data or new integrations. During development, I'd give developers secure coding guidelines and secure defaults in frameworks, IDE plugins and pre-commit secret scanning. In the pipeline I'd run SAST for code, SCA for vulnerable dependencies and licences, secret detection and IaC scanning, with thresholds that fail builds only for high-confidence critical issues so developers trust the tooling. Before release, DAST against staging and, for high-risk systems, a manual penetration test or code review. After release, I'd monitor with a bug bounty or vulnerability disclosure policy, runtime protection such as a WAF and logging. A security champions programme embeds knowledge inside teams. I'd measure success through time to fix, vulnerability escape rates and developer satisfaction, and use frameworks like OWASP SAMM or BSIMM to benchmark maturity and plan improvements.

Common mistake to avoid: Tool dumping on developers; Breaking builds for everything

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Application Security Engineer interview questions page. The first five are free, no sign-up needed.