Architecture and Technical Trade Offs Questions

Centers on system and solution design decisions and the trade offs inherent in architecture choices. Candidates should be able to identify alternatives, clarify constraints such as scale cost and team capability, and articulate trade offs like consistency versus availability, latency versus throughput, simplicity versus extensibility, monolith versus microservices, synchronous versus asynchronous patterns, database selection, caching strategies, and operational complexity. This topic covers methods for quantifying or qualitatively evaluating impacts, prototyping and measuring performance, planning incremental migrations, documenting decisions, and proposing mitigation and monitoring plans to manage risk and maintainability.

HardTechnical

37 practiced

You are designing a rollout for a new authentication flow that requires a coordinated database migration and service changes. Outline rollback and recovery procedures if the rollout causes widespread authentication failures, including partial rollbacks, dual-write strategies, and monitoring checks required to detect issues quickly.

MediumTechnical

29 practiced

Implement a small script in Bash or Python to compare time-series metric series for two deployments and flag regressions where p95 latency increases more than 20% and error rate increases by 2x. Describe how you would avoid false positives caused by sample size or outliers.

MediumTechnical

54 practiced

You're designing a global API gateway. Evaluate the trade offs in putting rate-limiting, auth, and observability in the gateway vs in sidecar proxies alongside each service. Include considerations on latency impact, deployment independence, and failure blast radius.

HardTechnical

31 practiced

You must convince leadership to allocate 20% of engineering time to reliability work despite short-term pressure to deliver features. Create a one-page argument that quantifies risk and benefit, shows how error budgets map to business impact, and proposes measurable milestones. What trade offs do you expect from leadership?

HardTechnical

29 practiced

Architect an observability strategy that balances metric cardinality and cost for a microservices environment with hundreds of services. Explain trade offs around high-cardinality tags, sampling, derived metrics, and retention policies, and propose a monitoring hierarchy for critical SLOs versus debugging data.

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