Understanding the Company's Infrastructure Context Questions
Research the company's public infrastructure information (engineering blog, tech talks, published case studies, job description). Understand what systems they operate at scale, what problems they likely face, and what your role would contribute to.
MediumTechnical
23 practiced
Given sample logs in this simple text format (timestamp service latency_ms db_errs), implement a Python function detect_incident_periods(log_lines: List[str]) -> List[dict] that finds contiguous periods where service latency and DB errors spike together. Use a threshold approach: consider latency > 2x median latency for that service and db_errs > 10 as a correlated spike. Merge adjacent high points into incident windows and return start/end timestamps and a short reason summary. Sample lines:2025-05-01T10:00:00Z api 120 02025-05-01T10:00:10Z api 130 02025-05-01T10:00:20Z api 900 502025-05-01T10:00:30Z api 800 452025-05-01T10:00:40Z api 140 0Provide robust parsing and explain how you compute the median baseline.
HardTechnical
25 practiced
The company relies heavily on managed services and many third-party integrations documented publicly. As an infra engineer, enumerate top security risks arising from this landscape (for example: secrets sprawl, overly permissive IAM, third-party lateral movement) and propose concrete mitigations: IAM policies, secrets management patterns, runtime protections, and CI checks.
HardSystem Design
22 practiced
Propose a chaos-engineering program based on public incidents described by the company. Include experiment types (latency injection, pod kill, disk error, network partition), safety checks, blast-radius controls, scheduling, automation tooling, and measurable success criteria. Explain how this program would be integrated into the deployment lifecycle and how teams would use results to harden systems.
EasyTechnical
21 practiced
When reviewing public incident reports and engineering posts, what three core observability signals (metrics, logs, traces) do you check first to triage a production problem? For each signal, explain why it matters, specific examples of queries or panels you would use, and how those signals map to CPU, I/O, network, and application-level issues.
MediumBehavioral
22 practiced
You will use public infra info to coordinate with SREs and product managers. Describe a real or hypothetical example where you prioritized work based on infrastructure signals found in public docs or early telemetry. Explain how you aligned stakeholders, communicated trade-offs, and measured success with KPIs after deployment.
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