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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.

HardTechnical
0 practiced
Given the following architecture: external clients -> API gateway (auth, rate-limiting) -> public frontends -> internal service mesh -> business services -> persistent SQL DB and object store, perform a security case study: identify the top 10 security weaknesses you would expect in a typical deployment, rank them by risk to customer data, propose prioritized mitigations, and estimate operational and performance costs for the top three mitigations.
HardTechnical
0 practiced
An attacker gains access to a developer's laptop that holds active credentials, SSH keys, and short-lived cloud tokens. As the SRE lead, outline immediate containment steps, how you would identify affected services and credentials, steps to rotate or revoke keys and tokens, evidence collection, and long-term controls to reduce probability and blast radius of such compromises.
MediumTechnical
0 practiced
How does threat modeling change when designing systems that must meet a specific regulation such as PCI-DSS or HIPAA? Provide examples of additional artifacts, controls, and evidence SREs must produce to satisfy auditors, and explain how to include compliance teams early in the design and threat-modeling process.
MediumSystem Design
0 practiced
Design a secrets management and rotation strategy for service credentials used by microservices across three geographically distributed regions. Constraints: zero-downtime deployments, immediate revocation capability, minimal key distribution lag, and limited operational overhead. Describe the architecture, rotation cadence, caching, revocation mechanism, and monitoring you would implement.
HardSystem Design
0 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.

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