Threat Modeling and Secure System Design Questions

Applying threat modeling and structured problem solving to secure system design. Candidates should be able to decompose complex security challenges by identifying business context, critical assets, threat actors, attack surfaces, and compliance requirements. Topics include threat modeling methodologies, attacker capability and motivation analysis, risk assessment and prioritization, selection of mitigations and compensating controls, and evaluation of trade offs among security, usability, cost, and performance. Candidates should also be able to produce implementation and monitoring plans that address scalability and maintainability and to clearly explain and justify design choices and residual risk to stakeholders.

EasyTechnical

31 practiced

Define 'defense-in-depth' and provide three concrete examples showing how an SRE team would implement defense-in-depth across network, host, and application layers. For each example explain what layer it protects and why layering these controls reduces overall risk.

HardSystem Design

28 practiced

Design a PCI-compliant payment processing service for a global SaaS platform: requirements include handling peak 100k transactions per second, multi-region failover, auditability, and strong defense-in-depth. Describe the high-level architecture (components and data flows), key threat-model highlights, controls for encryption and key management, monitoring/alerting you would implement, and how to collect evidence for compliance audits.

HardSystem Design

29 practiced

Design a secure, efficient database migration and deployment strategy for an online service that must avoid downtime. Include pipeline gates, code review and signing of migration scripts, dry-run and shadow-migration strategies, rollback mechanisms, and monitoring signals to detect malicious or faulty migrations quickly.

MediumSystem Design

34 practiced

Design a threat model for a CI/CD pipeline that builds, tests, and deploys container images into production. Components include: source code repository, CI runners/build agents, artifact registry, container signing, deployment orchestrator (Kubernetes), and the secrets store. Identify critical assets, likely attack vectors at each stage, recommended mitigations, and monitoring/alerting instrumentation to detect compromise.

EasyTechnical

27 practiced

Explain what threat modeling is and why it is important for Site Reliability Engineers (SREs). In your answer describe the purpose of threat modeling, when in the software lifecycle it should be performed, who (roles) should participate in a threat-modeling session, and two concrete outputs an SRE team should produce after completing a threat model (one technical artifact and one operational artifact). Provide brief examples tied to production infrastructure.

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