Clear
Your agent needs to make a decision, but the data it needs is spread across sources with different levels of trust, and it treats them equally.
How would you design the system to weight sources by trustworthiness?
General Medium

Answer:

  1. Assign trust levels: Rate each source's reliability, so weighting is possible.

  2. Weight by trust: Favor high-trust sources in reasoning, so decisions lean on reliable data.

  3. Corroborate low-trust data: Verify uncertain sources against trusted ones, so weak data isn't taken at face value.

  4. Flag low-trust reliance: Signal when an answer rests on weak sources, so users judge accordingly.

  5. Update trust from outcomes: Adjust ratings as sources prove reliable or not, so weighting improves.

Your agent works, but users complain it feels impersonal because it treats returning users identically to first-timers.
How would you design the system to recognize and adapt to returning users?
General Medium

Answer:

  1. Identify returning users: Recognize known users, so they aren't treated as strangers.

  2. Recall relevant history: Surface useful past context, so continuity is felt.

  3. Skip redundant onboarding: Don't re-ask what you know, so returning users aren't slowed.

  4. Apply known preferences: Use stored preferences where they help, so the experience feels tailored.

  5. Respect privacy: Apply memory only where it adds value, so recognition doesn't feel like surveillance.

Your agent needs to handle a request that requires it to act, observe the result, and adapt, but it plans everything upfront and can't adjust.
How would you design the system for adaptive act-observe-adapt loops?
General Medium

Answer:

  1. Interleave action and observation: Act, observe, then decide the next step, so the agent adapts to results.

  2. Avoid rigid upfront plans: Plan incrementally, so new information can change course.

  3. Feed results back: Use each action's outcome to inform the next, so adaptation is grounded.

  4. Bound the loop: Cap iterations, so adaptive loops don't run away.

  5. Recognize completion: Detect when the goal is met, so the loop exits appropriately.

Your agent works, but a single poorly-formed document in the index consistently surfaces and pollutes answers.
How would you design the system to prevent bad documents from polluting retrieval?
General Medium

Answer:

  1. Validate on ingestion: Check document quality before indexing, so bad ones don't enter.

  2. Detect polluting content: Identify documents that consistently harm answers, so they're flagged.

  3. Quarantine suspect documents: Hold questionable content out of retrieval, so it can't pollute.

  4. Filter at query time: Down-weight low-quality chunks, so bad content doesn't surface.

  5. Monitor per-document impact: Track which documents drive bad answers, so pollution sources are found.

Your agent needs to handle requests where the cost of latency and the cost of error both matter, but it optimizes only one.
How would you design the system to jointly optimize latency and accuracy?
General Medium

Answer:

  1. Define the joint objective: Weigh latency and accuracy together, so neither is ignored.

  2. Route by requirement: Match handling to whether speed or accuracy dominates, so the trade-off fits.

  3. Return early when confident: Answer fast when accuracy is already sufficient, so you don't over-spend time.

  4. Invest time only when needed: Add reasoning for hard cases, so accuracy costs latency only where it helps.

  5. Measure both: Track latency and accuracy jointly, so the balance is monitored.

Your agent works, but its quality depends on a chunking strategy that was never tuned for your actual documents.
How would you design the process to tune chunking for your content?
General Medium

Answer:

  1. Test chunk sizes: Evaluate retrieval quality across sizes, so you find what fits your content.

  2. Respect document structure: Chunk on semantic boundaries, so chunks stay coherent.

  3. Tune overlap: Adjust overlap to preserve context across chunks, so information isn't split awkwardly.

  4. Vary by document type: Use different strategies for different content, so each is chunked well.

  5. Measure against retrieval metrics: Judge chunking by its effect on retrieval, so tuning is grounded.

Your agent needs to serve answers that stay accurate as facts change, but users sometimes act on an answer long after it was given.
How would you design the system to handle answers that may become stale after delivery?
General Medium

Answer:

  1. Timestamp answers: Mark when each answer was valid, so staleness is knowable.

  2. State validity duration: Indicate how long an answer holds, so users know when to re-check.

  3. Flag volatile answers: Warn when facts may change soon, so users don't over-rely.

  4. Offer refresh: Let users re-verify current status, so they can update.

  5. Notify on material change: Alert users when a prior answer is affected, so acting on stale info is prevented.

Your agent works, but its dependence on a single expensive reranker makes retrieval too costly at scale.
How would you design the system to keep reranking affordable at scale?
General Medium

Answer:

  1. Rerank only top candidates: Apply the reranker to a small shortlist, so cost scales with a fixed set, not the corpus.

  2. Use a cheaper first stage: Filter aggressively before reranking, so fewer items need the expensive step.

  3. Cache rerank results: Reuse rankings for repeated queries, so you don't rerank identical requests.

  4. Right-size the reranker: Use a smaller model where quality allows, so cost drops.

  5. Skip when unnecessary: Bypass reranking for high-confidence retrievals, so you only pay when it helps.

Your agent needs to handle a workflow where a human, another agent, and an external system all act on the same task, but their actions collide.
How would you design the system to coordinate actions across humans, agents, and systems?
General Medium

Answer:

  1. Assign clear ownership: Define who owns the task at each stage, so multiple actors don't collide.

  2. Use locking or turns: Serialize access to the shared task, so simultaneous actions don't conflict.

  3. Maintain shared state: Keep one source of truth, so all actors work from the same picture.

  4. Track handoffs: Record who has the task when, so responsibility is unambiguous.

  5. Detect and resolve conflicts: Catch colliding actions and reconcile them, so consistency holds.

Your agent is stable, but you want to experiment with risky improvements without endangering the reliable version users depend on.
How would you design the system to experiment safely alongside a stable version?
General Medium

Answer:

  1. Isolate experiments: Keep experimental changes separate from the stable path, so risk is contained.

  2. Route a small slice: Send limited traffic to experiments, so most users stay on stable.

  3. Set guardrails: Auto-halt experiments that breach quality floors, so bad ones stop fast.

  4. Compare against stable: Measure experiments relative to the reliable baseline, so value is clear.

  5. Promote only proven wins: Graduate experiments to stable only after validation, so reliability is protected.

Your agent needs to handle a request where the user provides conflicting requirements, and it silently picks one.
How would you design the system to handle conflicting user requirements?
General Medium

Answer:

  1. Detect the conflict: Recognize when requirements contradict, so it's not resolved silently.

  2. Surface it to the user: Point out the conflict, so they can decide.

  3. Propose resolutions: Offer ways to reconcile, so the user has options.

  4. Don't guess silently: Avoid arbitrarily choosing, so you don't act on a wrong interpretation.

  5. Confirm the resolution: Verify the chosen path, so you build on agreement.

Your agent works, but you realize it's making external calls that individually seem fine but collectively violate a third party's terms of service.
How would you design the system to stay within external usage terms?
General Medium

Answer:

  1. Encode usage limits: Enforce third-party rate and volume limits, so you don't exceed them.

  2. Track aggregate usage: Monitor total calls across the system, so collective limits aren't breached.

  3. Respect terms in policy: Bake ToS constraints into a policy layer, so compliance is enforced centrally.

  4. Throttle to stay compliant: Slow calls to stay within terms, so you don't cross the line.

  5. Alert on approach: Warn when nearing limits, so you act before violating.

Your agent needs to maintain quality as your team grows, but different engineers have different implicit standards for what "good" means.
How would you design the process to standardize quality judgment across a growing team?
General Medium

Answer:

  1. Codify quality criteria: Write down explicit standards, so "good" isn't implicit.

  2. Use shared rubrics: Grade against common criteria, so judgment is consistent.

  3. Maintain a canonical eval set: Give everyone one benchmark, so quality is measured the same way.

  4. Calibrate judgments: Compare engineers' assessments and align them, so standards converge.

  5. Automate where possible: Encode standards in automated checks, so consistency doesn't depend on individuals.

Your agent needs to work with a tool that occasionally returns success but with subtly wrong data, which the agent trusts blindly.
How would you design the system to validate tool results beyond success status?
General Medium

Answer:

  1. Validate content, not just status: Check the returned data itself, so wrong-but-successful results are caught.

  2. Sanity-check against expectations: Verify results fall in plausible ranges, so anomalies surface.

  3. Cross-check critical data: Confirm important values via a second source, so errors are caught.

  4. Detect suspicious patterns: Flag results that look off, so subtle corruption is noticed.

  5. Handle bad data gracefully: Don't build on questionable results, so errors don't propagate.

Your agent's answers are correct, but it can't tell the user how it knows, which matters in a domain where provenance is required.
How would you design the system to provide provenance for every answer?
General Medium

Answer:

  1. Track source per claim: Record where each fact came from, so provenance is available.

  2. Cite in the answer: Attribute claims to their sources, so users see the basis.

  3. Preserve the chain: Trace facts from source through reasoning to answer, so the full path is known.

  4. Make provenance retrievable: Enable looking up any answer's sources, so it's verifiable.

  5. Distinguish sourced from inferred: Mark what's grounded versus derived, so provenance is honest.

Your agent needs to respond to events, but sometimes events fire in rapid succession and it processes each fully, falling behind.
How would you design the system to handle high-frequency event streams?
General Medium

Answer:

  1. Debounce rapid events: Collapse bursts into single handling, so you don't process every micro-event.

  2. Batch event processing: Handle events in groups, so throughput keeps pace.

  3. Prioritize significant events: Process important ones first, so critical events aren't delayed.

  4. Drop or sample the trivial: Skip low-value events under load, so you keep up.

  5. Process asynchronously: Decouple intake from handling, so bursts are buffered.

Your agent needs to handle sensitive requests where logging the full input for debugging would itself be a privacy violation.
How would you design the system to debug without logging sensitive input?
General Medium

Answer:

  1. Redact before logging: Strip sensitive content from logs, so debugging data isn't a violation.

  2. Log structure, not content: Capture shape and metadata over raw data, so you debug without exposure.

  3. Use privacy-preserving signals: Log hashes or categories instead of values, so patterns are visible safely.

  4. Enable opt-in detailed logging: Capture full data only with consent, so exceptions are controlled.

  5. Access-control logs: Restrict who sees any sensitive log data, so exposure is limited.

Your agent works, but a subtle prompt change last week degraded quality and no one can pinpoint which change did it.
How would you design the system to attribute quality changes to specific edits?
General Medium

Answer:

  1. Version every change: Track each prompt and config edit, so changes are individually identifiable.

  2. Evaluate on each change: Run evals per edit, so quality impact is measured immediately.

  3. Tie metrics to versions: Link quality scores to specific versions, so regressions map to edits.

  4. Change one thing at a time: Isolate edits, so impact is attributable.

  5. Bisect regressions: Test intermediate versions to find the culprit, so the bad edit is located.

Your agent needs to handle a request that touches data across several microservices, but assembling it means a slow chain of sequential calls.
How would you design the system to assemble cross-service data efficiently?
General Medium

Answer:

  1. Fetch in parallel: Call independent services concurrently, so total time is the slowest, not the sum.

  2. Batch related calls: Combine requests to the same service, so you reduce round-trips.

  3. Cache stable data: Reuse slow-changing service data, so you skip repeated fetches.

  4. Prefetch predictable needs: Start likely calls early, so latency hides behind other work.

  5. Aggregate at one layer: Assemble data in a dedicated step, so orchestration stays clean.

Your agent's output quality is good, but it varies unpredictably with the exact model version, and providers update models silently.
How would you design the system to insulate quality from silent model updates?
General Medium

Answer:

  1. Pin stable versions: Use fixed model endpoints where available, so silent updates don't reach you.

  2. Run continuous evals: Test the live model constantly, so quality changes are detected fast.

  3. Alert on quality shifts: Flag sudden changes, so silent updates trigger investigation.

  4. Keep fallback models ready: Have alternatives on standby, so you can switch on degradation.

  5. Design robust prompts: Avoid dependence on version-specific quirks, so updates affect you less.