Dev
System Design Prompt Generator
System design interviews reward process over memorisation. Candidates who walk through requirements, API design, data modelling, scaling, and trade-offs in a structured way consistently outperform those who jump straight to a diagram. This generator produces practice prompts for five classic systems with the framework strong candidates use. One input drives the output: the System to design dropdown — a URL shortener, a news feed, a chat app, a ride-sharing service, or a rate limiter. The generator returns the prompt plus a six-step framework: requirements, API, data model, high-level design, scaling, and trade-offs. Work through each step out loud, stating assumptions and justifying major decisions. Practise with multiple system types to build fluency with the framework itself — covering all six steps under time pressure is the skill you are developing.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Pick a system to design.
- Click Generate to get the prompt and framework.
- Work through each step out loud or on paper.
- State assumptions and justify each decision.
Use Cases
- •Rehearsing for a system design interview
- •Running a mock design session in a study group
- •Practising architectural reasoning methodically
- •Generating prompts for a design study plan
- •Teaching a structured approach to system design
Tips
- →Clarify requirements and scale before designing anything.
- →Talk through trade-offs — that is what interviewers assess.
- →Estimate rough numbers for scale early.
- →Practise the same framework until it is automatic.
FAQ
which systems can I practise designing
Five: a URL shortener, a news feed, a chat app, a ride-sharing service, and a rate limiter — among the most common system design interview topics, collectively covering a wide range of architectural challenges.
what are the six framework steps
Requirements (functional and non-functional, plus scale estimates), API (key endpoints and contracts), data model (storage and keys), high-level design (components and request flow), scaling (caching, sharding, replication, bottlenecks), and trade-offs.
is there one correct answer to a system design prompt
No. System design is about reasoning through trade-offs, not arriving at a single diagram. Interviewers assess how you think — whether you clarify requirements, justify decisions, and acknowledge limitations — more than the specific architecture.
why start with requirements before designing
Requirements and scale estimates shape every later decision. A design for 1000 QPS differs enormously from one for 1 million QPS. Candidates who skip requirements often design for the wrong scale or omit constraints that matter.
You might also like
Popular tools from other categories that share themes with this one.
Try these next
More free tools from other corners of the catalog, picked by shared themes.