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A reliable way to approach a system design interview is to move from scope to scale, then connect requirements to interfaces and data, sketch the end-to-end architecture, and finish with a focused discussion of trade-offs and failure cases. This sequence keeps the design explainable without pretending every interviewer follows the same format.
What the five steps are—and what they are not
The title of Shohruh Sharipov’s DEV Community article identifies a five-step framework and six worked examples, but the accessible indexed preview does not expose the complete sequence or name those examples. The steps below are a practical synthesis of published interview guidance, not a reconstruction of Sharipov’s exact framework or examples. DEV Community’s indexed preview describes clarifying requirements and stating scale estimates before drawing boxes.
Interview formats vary by company and interviewer. Treat this as a flexible order of operations: spend more time where the prompt or interviewer signals the most risk, and ask whether they want a particular focus.
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Turn the prompt into an agreed scope. Identify who uses the system, the core actions they need, and what is explicitly outside the exercise. Then ask which quality goals matter most: latency, availability, consistency, freshness, cost, or another constraint.
#1 Best Overall
- Ask about the essential user journeys and expected behavior.
- Separate must-have features from plausible but nonessential extensions.
- Identify constraints that would change the design, such as read-heavy versus write-heavy traffic or strict freshness needs.
- Summarize the scope aloud and invite correction before moving on.
Scoping prevents an open-ended prompt from becoming an unbounded feature list. The handbook and Exponent both place requirement clarification early in their approaches. Grokking the System Design Interview; Exponent’s system design interview guide.
Step 2: Estimate enough scale to justify choices
Make rough estimates only when they help explain an architectural decision. State assumptions, show the arithmetic briefly, and use the result to reason about capacity or bottlenecks—not to imply precision the prompt does not support.
- Estimate users or active clients, then translate that into approximate request volume.
- Distinguish average traffic from peak traffic if peaks could affect capacity.
- Consider data growth, bandwidth, or storage only when they bear on the design.
- Say what an estimate changes: for example, whether one service is sufficient, whether data needs partitioning, or whether caching deserves consideration.
There is no universal number of calculations an interview requires. An order-of-magnitude estimate can be useful when it changes a decision; otherwise, move on rather than spending time polishing a speculative figure. Both the handbook and interview guidance connect estimates to concrete choices such as scaling, partitioning, and bandwidth planning. Grokking the System Design Interview; Exponent’s system design interview guide.
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Step 3: Define the interface, entities, and access patterns
Translate the agreed user journeys into the system’s external contract and the information it must store or retrieve. This is the bridge between requirements and architecture: a feature implies operations, operations imply data access, and access patterns constrain storage choices.
Rank #3
- List the essential API operations or client-to-system interactions.
- Identify the core entities and the relationships that matter to those operations.
- Describe the important reads and writes, including how data is looked up or updated.
- Note any requirement for ordering, freshness, or consistency that changes how those operations behave.
Keep this at the level needed to explain the design. A complete schema or exhaustive API specification usually distracts unless the prompt specifically asks for one. The interview handbook treats interfaces, data models, and access patterns as explicit links between requirements and system components. Grokking the System Design Interview; System Design Interview Handbook.
Step 4: Sketch the end-to-end design and trace a request
Draw the major components and show how a core request travels through them. Start with a legible high-level view; add detail only when it clarifies a requirement, a data flow, or a constraint.
Rank #4
- Place the client and the system boundary on the diagram.
- Add the major services and storage or communication components required by the core use cases.
- Draw arrows for the request path and the relevant data path.
- Walk through one important read and one important write, explaining where data is created, moved, and returned.
- Check that every required feature has a plausible path through the design.
The objective is shared understanding, not a diagram crowded with technology names. Exponent’s outline similarly separates a high-level sketch from a more detailed examination of components. Exponent’s system design interview guide; System Design Interview Handbook.
Step 5: Deep-dive on risk, failure, and trade-offs
Choose one or two components that matter most to the stated workload or quality goals. Explain normal behavior, what can fail, how the system responds, and why the design is preferable to a plausible alternative under these requirements.
Best Value
- Identify the likely bottleneck or failure mode rather than discussing every component equally.
- Explain the effect of a failure on users and the recovery or degraded behavior.
- Compare alternatives against workload, latency and freshness, availability and consistency, partitioning, operating complexity, and cost.
- Make the trade-off explicit: which requirement improves, and what becomes harder or less favorable?
- Close by noting the largest unresolved risk or the next design question you would investigate.
A technology choice is not persuasive on its own. Tie it to the requirement that drives it, and acknowledge the cost of the choice. The handbook and Exponent both emphasize focused component analysis, bottlenecks, operational concerns, and trade-offs. Grokking the System Design Interview; Exponent’s system design interview guide.
How to keep the framework useful in a live interview
Use the sequence as a map, not a script. If the interviewer redirects the discussion, follow that lead; if a requirement is ambiguous, pause to resolve it rather than layering assumptions into the diagram. Keep your reasoning visible by stating assumptions and connecting each major choice to a need you already identified.
Most importantly, adapt the amount of detail to the prompt. A high-level discussion may not need a full data model; a storage-focused prompt may justify spending more time on entities and access patterns. The common thread across interview guides is the progression from requirements to a coherent design and then to the risks and trade-offs that matter—not adherence to one mandatory step count.
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