Learn system design. Build real architectures.
Practice architecture decisions, uncover missing pieces, compare tradeoffs, and generate senior-level explanations - then design your real systems with the same engine.
Practice and prep for interviews
Work through system design scenarios, study architecture concepts, and generate interview-ready explanations - with senior-level review of every design.
- 10 guided scenarios with requirements and pitfalls
- Interview-readiness scoring and missing-piece detection
- Senior-level reference architectures to compare against
Plan a real software architecture
Start from a guided brief or template, get a recommended starter architecture, review it for production risk, and export an implementation-ready spec.
- Recommended components from your project brief
- Production-risk review and suggested additions
- Exportable architecture spec (Markdown, JSON, PNG)
One engine, two modes
Guided system design scenarios
Ten interview-grade prompts with requirements, constraints, and common pitfalls.
Architecture review
Deterministic rules catch missing rate limiters, DLQs, idempotency, audit logs, and more.
Component tradeoffs & failure modes
Every component carries when-to-use, alternatives, tradeoffs, and how it fails.
Interview-ready explanations
Turn your design into a confident, first-person walkthrough of the request flow and tradeoffs.
Real architecture specs
In Build Mode, export an implementation-ready spec from your project brief.
Atlas Coach guidance
Quiet, senior-engineer nudges as you design - never popups, never noise.
Example output
From a brief to a design you can defend
A URL shortener System Atlas reasons about: a typed component diagram, the tradeoff behind each choice, and the missing pieces a reviewer would flag.
Selected · Primary store
Postgres vs DynamoDB
Postgres fits relational data, transactions, and operational familiarity for the first version.
ADR-001 · Primary store
Use Postgres as the primary store; revisit if write volume outgrows a single primary.
Study it as an interview scenario, or build your own from scratch.