Software engineering interview prep
A system design interview question generator creates realistic architecture practice prompts with product context, scale constraints, functional requirements, non-functional requirements, follow-up questions, and scoring rubrics. Use it to practice architecture tradeoffs instead of memorizing one-size-fits-all diagrams.
Generated interview packet
Scale
500K users
Prompted scale target for capacity and tradeoff discussion.
Requirements
8
Functional and non-functional prompts for the session.
Follow-ups
5
Interviewer questions to test depth and judgment.
# System Design Interview Question Role: Backend Engineer Difficulty: Senior Interview length: 45 minutes Product context: Developer platform Primary focus: Scalability Secondary focus: Reliability Expected scale: 500K users ## Prompt Design a CI job queue with logs and retry controls Design the backend and supporting architecture for this product. Start with requirements and assumptions, then walk through APIs, data model, major components, data flow, scaling strategy, reliability plan, and operational visibility. ## Functional requirements - support 500K users with predictable latency for the core user workflow - define the main API surfaces, data stores, and asynchronous jobs - explain how the system handles validation, permissions, and abuse cases - handle burst traffic without dropping accepted writes ## Non-functional requirements - separate read-heavy paths from write-heavy paths - identify the first component likely to saturate - continue serving degraded results during dependency failures - define retry, idempotency, and backoff behavior ## Follow-up questions - What data would you denormalize first, and why? - Where would you introduce queues, caches, or materialized views? - How would you make writes idempotent across retries? - Which alerts would page someone, and which would only create a ticket? - What part of this design would you simplify for the first production version? ## Evaluation rubric - Problem framing: clarified users, workflows, constraints, and success metrics. - Architecture: chose coherent components with clear ownership boundaries. - Data model: covered core entities, indexes, lifecycle, and consistency tradeoffs. - Operations: included failure handling, observability, capacity, and rollout controls. - Communication: explained tradeoffs without overfitting to one technology. ## Candidate prep checklist - Sketch the primary read and write paths before choosing databases. - State explicit assumptions for traffic, latency, retention, and availability. - Call out the first bottleneck and one practical mitigation. - Reserve five minutes for risks, monitoring, and rollout plan. ## Targeted study plan - Review one comparable architecture before the session. - Practice explaining API contracts and entity relationships out loud. - Spend 15 minutes on tradeoffs and failure modes. ## Interviewer notes Add high-scale constraints, operational risk, migration pressure, and tradeoff depth. Look for explicit tradeoffs, not a perfect diagram. Strong answers should connect user workflows to data ownership, failure handling, and measurable production signals.
Strong system design practice starts with ambiguity. State the product goal, clarify the main users, set explicit scale assumptions, and describe the read and write paths before choosing infrastructure.
After the first architecture pass, pressure-test the design with failure modes. Ask what breaks first, where data becomes inconsistent, how retries stay safe, and which production signals would prove the system is healthy.
A system design interview question generator creates realistic architecture prompts with product context, scale constraints, requirements, follow-up questions, and evaluation criteria.
Practice by clarifying requirements, sketching APIs and data models, naming tradeoffs, handling failures, and explaining how the design would be monitored in production.
A good prompt has a clear product goal, realistic users, measurable constraints, room for tradeoffs, and follow-up questions that reveal depth beyond a memorized architecture.
Yes. Choose Senior or Staff difficulty to add scale, reliability, migration, observability, cost, and multi-team architecture expectations.
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