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.

HardSystem Design

28 practiced

Architect a globally-distributed payments ledger service that requires strong consistency and atomic transaction semantics across regions. The system must sustain 10k TPS with <150ms median write latency for regional users. Discuss choices around consensus protocols, leader placement, synchronous replication versus quorum writes, partition handling, and trade-offs between latency, throughput, and operational complexity.

HardTechnical

30 practiced

After moving a major feature to an asynchronous architecture, design SLOs and SLAs that map to user-visible outcomes and business metrics. Define error budgets, alert thresholds, rollback and mitigation procedures for SLO breaches, and instrumentation needed to measure end-to-end user-visible latency and completion rates for background jobs.

EasyTechnical

36 practiced

You manage a public API consumed by external developers. Compare the trade-offs between URI versioning (e.g., /v1/), header-based version negotiation, and a versionless semantic strategy that relies on strict backward compatibility. Consider developer experience, operational complexity, rollback, and migration effort in your recommendation.

MediumTechnical

27 practiced

As a TPM evaluating whether to adopt microservices with a small, less experienced engineering team, propose a decision framework. List concrete technical and organizational criteria to weigh (coupling, deployment velocity, ops maturity, testing practices), short-term and long-term trade-offs, and an incremental adoption plan if you decide to move toward microservices.

EasyTechnical

45 practiced

You're designing a new service to store user sessions and preferences. At a high level, what factors would guide your decision between a relational SQL database and a document/key-value NoSQL store? Discuss trade-offs around consistency, query expressiveness, scaling, operational burden, and developer productivity in the context of a technical product roadmap.

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