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Your agent needs to work with a knowledge base full of internal jargon and acronyms that generic embeddings don't understand.
How would you design retrieval to handle domain-specific terminology?
General Medium

Answer:

  1. Expand acronyms and jargon: Normalize domain terms in queries and documents, so retrieval matches despite specialized vocabulary.

  2. Build a domain glossary: Maintain term mappings, so the system understands internal language.

  3. Consider domain embeddings: Use or fine-tune embeddings for your field, so semantic search grasps the terminology.

  4. Add keyword search: Combine with exact matching, so precise jargon terms are caught reliably.

  5. Enrich with synonyms: Map terms to their variants, so different phrasings of the same concept match.

  6. Test on domain queries: Evaluate with real jargon-heavy questions, so terminology gaps surface.

Your agent's development has slowed to a crawl because every change requires manually testing dozens of scenarios by hand.
How would you design the process to make agent iteration fast and safe?
General Medium

Answer:

  1. Automate evaluation: Replace manual testing with an automated suite, so changes are validated in minutes, not hours.

  2. Build a fast feedback loop: Run evals on every change, so engineers see impact immediately.

  3. Version prompts and config: Externalize and track them, so changes are quick and reversible.

  4. Enable safe experimentation: Test variants in isolation, so trying things doesn't risk production.

  5. Canary automatically: Roll changes out gradually with monitoring, so safe iteration doesn't need manual gatekeeping.

  6. Keep rollback instant: Make reverting trivial, so speed doesn't come at the cost of safety.

Your agent occasionally produces an answer that's plausible but subtly contradicts a fact it stated moments earlier in the same response.
How would you design the system to ensure internal consistency within a single response?
General Medium

Answer:

  1. Ground in shared context: Anchor the whole response to consistent source data, so claims don't diverge.

  2. Check for contradictions: Verify the response against itself, so internal conflicts are caught.

  3. Reduce randomness: Lower temperature for factual content, so the model doesn't wander mid-response.

  4. Structure the output: Build responses from validated facts, so consistency is designed in.

  5. Verify before delivery: Run a consistency check on the final answer, so contradictions don't reach users.

Your agent needs to process confidential documents, but you're using a third-party model and can't send that data externally.
How would you design the system to handle confidential data with external models?
General Medium

Answer:

  1. Redact before sending: Strip confidential content from prompts, so sensitive data never leaves your environment.

  2. Use local models for sensitive parts: Process confidential data on-premise, so it stays internal.

  3. Choose zero-retention providers: Use no-training, no-logging endpoints, so external data isn't stored.

  4. Control data residency: Route to compliant regions, so data stays where it's allowed.

  5. Tokenize sensitive fields: Replace confidential values with tokens, so the model works without seeing the real data.

  6. Audit data flows: Track what leaves your environment, so leaks are detectable.

Your agent's tools each work, but the agent frequently picks a reasonable-looking tool that's subtly wrong for the specific task.
How would you design the system to improve tool-selection accuracy?
General Medium

Answer:

  1. Write precise descriptions: Make each tool's purpose and limits explicit, so the model chooses on clear criteria.

  2. Disambiguate similar tools: Differentiate overlapping tools clearly, so near-matches don't get confused.

  3. Provide selection examples: Show correct tool choices for representative tasks, so the model learns the mapping.

  4. Retrieve relevant tools: Surface only applicable tools per query, so the model isn't distracted by wrong-but-plausible options.

  5. Validate the choice: Check the selected tool fits the task, so subtle mismatches are caught.

  6. Monitor misfires: Track wrong-tool selections, so recurring confusion gets fixed.

Your agent gives good answers, but users often need to ask three follow-ups to get what they actually wanted because the first answer missed their real intent.
How would you design the system to better capture user intent upfront?
General Medium

Answer:

  1. Clarify ambiguous requests: Ask targeted questions when intent is unclear, so you answer the real need, not a guess.

  2. Use context: Draw on history and profile, so you infer intent from what you already know.

  3. Anticipate the real goal: Address the underlying need, not just the literal question, so answers hit the target.

  4. Offer to go deeper: Surface likely follow-ups proactively, so users get more without asking.

  5. Confirm interpretation: State your understanding on complex requests, so misreads get corrected early.

Your agent needs to handle a surge of traffic during a product launch, but you can't tell in advance whether your infrastructure will hold.
How would you design the process to prepare for and handle traffic surges?
General Medium

Answer:

  1. Load-test to failure: Simulate surge traffic before launch, so you know your limits in advance.

  2. Provision headroom: Scale capacity ahead of the surge, so you're not scrambling when it hits.

  3. Autoscale dynamically: Add capacity as load rises, so infrastructure matches demand.

  4. Queue and shed: Buffer excess and drop low-priority load, so overload degrades gracefully.

  5. Cache and precompute: Prepare common responses ahead, so the surge hits cache, not the model.

  6. Monitor in real time: Watch metrics live during the surge, so you react before failures cascade.

Your agent's answers are stored and reused, but when the source data changes, the cached answers become wrong and nobody updates them.
How would you design cache invalidation tied to underlying data changes?
General Medium

Answer:

  1. Link cache to sources: Map cached answers to the data they depend on, so you know what to invalidate when data changes.

  2. Invalidate on change: Clear affected entries when sources update, so stale answers don't persist.

  3. Version cache keys: Include data version in the key, so changed data misses the old cache naturally.

  4. Set TTLs as backstop: Expire entries on a schedule, so stale data ages out even if invalidation misses.

  5. Verify freshness on serve: Check the cached answer is still valid before returning, so wrong answers are caught.

Your agent produces different quality for paying versus free users on identical requests, and it's not intentional — it's an accident of how load gets distributed.
How would you design the system to deliver predictable quality across user tiers?
General Medium

Answer:

  1. Define tier guarantees: Specify quality and latency per tier explicitly, so behavior is intentional, not accidental.

  2. Isolate tier resources: Separate capacity per tier, so load on one doesn't degrade another.

  3. Route deliberately: Assign models and paths by tier on purpose, so quality differences are designed, not emergent.

  4. Reserve capacity: Guarantee headroom for premium tiers, so they're protected under load.

  5. Monitor per tier: Track quality separately by tier, so unintended gaps surface.

Your agent needs to decide between answering from its own knowledge and looking something up, but it either always searches (slow, costly) or never does (stale, wrong).
How would you design the system to decide when to retrieve versus answer directly?
General Medium

Answer:

  1. Classify the query type: Detect whether a question needs fresh, specific, or external facts, so retrieval fires only when it adds value.

  2. Answer stable knowledge directly: Skip retrieval for timeless or general questions, so you avoid needless latency and cost.

  3. Retrieve for volatile or specific facts: Look up current, niche, or proprietary information, so answers stay accurate where knowledge goes stale.

  4. Use confidence as a trigger: Retrieve when the model is uncertain, so lookups happen exactly when the model would otherwise guess.

  5. Consider the cost of being wrong: Retrieve more readily for high-stakes questions, so accuracy is prioritized where errors matter.

  6. Monitor the decision quality: Track needless and missed retrievals, so the routing calibrates toward the right balance over time.

Your agent has grown into a sprawling system that works, but no one fully understands it end to end, and onboarding new engineers takes months.
How would you design the system for understandability and maintainability at scale?
General Medium

Answer:

  1. Modularize clearly: Break the system into well-defined components, so each part can be understood in isolation.

  2. Document architecture: Maintain clear diagrams and specs, so the whole is graspable without reading all the code.

  3. Standardize patterns: Use consistent approaches across components, so engineers learn one pattern, not many.

  4. Make behavior traceable: Provide end-to-end observability, so anyone can follow how a request flows.

  5. Keep interfaces clean: Define clear contracts between parts, so components can be understood without their internals.

  6. Encode knowledge in tests: Maintain evals that document expected behavior, so intent stays visible and current.

  7. Reduce accidental complexity: Prune unnecessary moving parts, so the system stays only as complex as it needs to be.

Your agent needs to work reliably, but the underlying model provider occasionally changes model behavior without a version bump, breaking your assumptions.
How would you design the system to stay robust to silent provider-side model changes?
General Medium

Answer:

  1. Run continuous evals: Test the live model regularly, so silent behavior changes surface quickly.

  2. Monitor output patterns: Track response characteristics over time, so drift becomes visible.

  3. Pin versions where possible: Use stable model endpoints, so you avoid unannounced changes when you can.

  4. Alert on metric shifts: Flag sudden quality or format changes, so provider-side changes trigger investigation.

  5. Keep a fallback: Have an alternative model ready, so you can switch if behavior degrades.

  6. Design defensively: Avoid depending on undocumented quirks, so changes to them don't break you.

Your agent's outputs occasionally get used as inputs to itself in a loop, and small biases amplify into badly skewed results over iterations.
How would you design the system to prevent self-reinforcing bias in iterative processes?
General Medium

Answer:

  1. Break the feedback loop: Avoid feeding outputs straight back as inputs, so biases don't compound.

  2. Ground each iteration: Re-anchor to source data every cycle, so drift from reality is corrected.

  3. Inject fresh signal: Bring in external validation between iterations, so errors don't echo unchecked.

  4. Detect drift: Monitor how outputs change across iterations, so amplification is caught early.

  5. Bound iterations: Cap how many cycles run, so any amplification is limited.

  6. Validate against ground truth: Check iterated results against reality, so skew is measurable and correctable.

Your agent needs to operate across teams that each want different behavior, but there's only one shared agent and changes for one team break another.
How would you design the system to support divergent needs without conflict?
General Medium

Answer:

  1. Separate shared from custom: Isolate a common core from team-specific config, so customization doesn't touch shared logic.

  2. Namespace configurations: Scope prompts and settings per team, so one team's changes stay contained.

  3. Layer customization: Let teams override defaults without forking, so divergence is managed cleanly.

  4. Test per team: Run evals for each team's config, so changes are validated in each context.

  5. Govern shared changes: Require review for core edits, so shared modifications don't silently break teams.

Your agent's performance is measured only by an offline metric, but the number keeps improving while users seem no happier.
How would you design the system to align your metrics with real user value?
General Medium

Answer:

  1. Anchor to user outcomes: Measure task success and satisfaction, so metrics track what users actually care about.

  2. Validate metric correlation: Check that your offline metric predicts real value, so you're not optimizing a proxy that's drifted from reality.

  3. Capture direct feedback: Collect thumbs and follow-up behavior, so user sentiment feeds the metric.

  4. Avoid gaming: Watch for the metric improving while quality doesn't, so you catch metric-hacking early.

  5. Use multiple signals: Combine several metrics, so no single number can mislead the whole picture.

  6. Revisit metrics regularly: Re-examine whether they still reflect value, so they don't ossify as the product evolves.

Your agent needs to make a recommendation but the available data genuinely doesn't support a confident answer, yet stakeholders expect a definitive response.
How would you design the system to handle genuinely insufficient information honestly?
General Medium

Answer:

  1. Recognize insufficiency: Detect when data doesn't support a confident answer, so the gap is acknowledged, not papered over.

  2. Communicate the limitation: State plainly what can't be determined, so stakeholders aren't misled by false confidence.

  3. Give a qualified answer: Provide the best available assessment with caveats, so users get value without overreach.

  4. Specify what's missing: Identify what data would resolve the question, so the path to a real answer is clear.

  5. Resist pressure to fabricate: Don't manufacture certainty to satisfy expectations, so honesty holds under stakeholder pressure.

Your agent works well but consumes so much GPU memory during inference that you can't serve enough concurrent users on your hardware.
How would you design inference serving to maximize throughput on limited hardware?
General Medium

Answer:

  1. Batch requests: Process multiple requests together, so GPU utilization rises without proportional memory cost.

  2. Quantize the model: Use lower-precision weights, so memory footprint drops with acceptable quality loss.

  3. Use efficient serving: Adopt optimized inference engines like vLLM, so memory and throughput are better managed.

  4. Manage the KV cache: Apply paged attention, so memory for context is used efficiently.

  5. Right-size the model: Use the smallest model meeting quality needs, so hardware serves more users.

  6. Offload strategically: Move less-used weights off-GPU when possible, so memory frees up for concurrency.

Your agent's answers depend on which documents got indexed, but nobody can tell what's actually in the index or when it was last updated.
How would you design the system for index transparency and content visibility?
General Medium

Answer:

  1. Track index contents: Maintain a catalog of what's indexed, so coverage is known, not guessed.

  2. Record freshness: Store when each source was last updated, so staleness is visible.

  3. Expose coverage gaps: Identify what's missing from the index, so blind spots are known.

  4. Log index changes: Track additions, updates, and deletions, so the index history is auditable.

  5. Surface source in answers: Show which indexed content was used, so users see what informed a response.

Your agent's guardrails block harmful requests, but they also block a frustrating number of legitimate ones, and users are complaining about false refusals.
How would you design guardrails to minimize false positives without weakening safety?
General Medium

Answer:

  1. Tune thresholds carefully: Calibrate sensitivity against real data, so you catch harm without over-blocking legitimate requests.

  2. Measure both error types: Track false positives and false negatives, so you optimize the actual tradeoff, not just one side.

  3. Use context, not keywords: Judge intent over surface terms, so benign requests aren't blocked for matching a word.

  4. Layer graduated responses: Warn or clarify before hard-blocking, so borderline cases get nuance instead of refusal.

  5. Route ambiguous cases to review: Escalate uncertain ones, so hard calls get judgment rather than a blunt block.

  6. Learn from false refusals: Feed over-blocked cases back into tuning, so precision improves over time.

Your agent handles support tickets, but it treats every ticket as independent and misses that many are duplicates or part of the same underlying issue.
How would you design the system to recognize related and duplicate requests?
General Medium

Answer:

  1. Detect similar requests: Use semantic matching against recent tickets, so duplicates are recognized rather than handled fresh each time.

  2. Cluster by root cause: Group related tickets around shared underlying issues, so patterns become visible.

  3. Reuse prior resolutions: Apply known answers to duplicate issues, so you don't re-solve the same problem repeatedly.

  4. Link related threads: Connect tickets from the same user or issue, so context carries across them.

  5. Surface trends: Flag spikes in related requests, so systemic problems get escalated, not just individually handled.