Apple Security Engineer Interview Questions

I would start by identifying the data, the threat model, and the places where the data is most likely to be exposed. Then I would apply least privilege, encryption, strong authentication, secure storage, and clear audit logging. The main goal is to protect privacy without making the product hard to use.

I would map the feature’s inputs, trust boundaries, and valuable assets before implementation begins. Then I would identify realistic abuse cases and rank them by impact so the team can fix the highest-risk issues early. Good threat modeling should change the design, not just produce a document.

I would check how identities are verified, how sessions are created, how tokens are stored, and how privilege changes are controlled. I would also verify that the flow resists account takeover, replay, and session theft. A strong answer shows that authentication is only safe when the whole lifecycle is well designed.

I would use parameterized queries or safe database APIs so untrusted input never becomes part of the SQL command. Then I would review the surrounding code for other unsafe query-building patterns and add testing to catch regressions. The key is to remove the injection path rather than trying to sanitize everything manually.

XSS happens when untrusted input is executed as script in a browser. I would prevent it with output encoding, safe templating, strong content handling rules, and browser protections where appropriate. A good answer also distinguishes reflected, stored, and DOM-based XSS.