AIAI Architect CircleSYSTEM DESIGN CHALLENGE LAB
CHALLENGE ONE / SYSTEM DESIGN + AI RELIABILITY

One refund.
One timeout.
One defensible design.

Design a refund service that recovers safely. Break it, inspect the evidence, fix it, and submit your design.

See the seven steps

Free account required · Google or email · No payment required

01Design itClarify the promise
02Break & fix itTest real decisions in a model
03Submit itGet specific improvement feedback
04Go furtherClaim eligible founding access
YOUR INTERVIEW BRIEF

Design a reliable refund service.

An online retailer accepts authorized refund requests, tracks their status, and recovers when the provider’s response is missing.

Preserve one authorized $45 intent, prevent duplicate effects, communicate uncertainty honestly, and assign unresolved work to an owner.

The lab models one operation and separate authority and operating scenarios. It is not a live financial service or a production load test.

WHAT YOU WILL DO

Make the decision visible.

  1. Define requirements, responsibilities, and customer messages.
  2. Use ARCHVIEW to expose the risky boundaries.
  3. Repair three simulations and validate 23 authored cases.
  4. Answer five changed-scenario questions.
  5. Submit for a versioned learning report, then revise if needed.
THE COMPLETE LEARNING JOURNEY

Seven stages. One final submission.

How passing works
Complete all seven stages and their required decisions. All design-contract checks, all 23 modeled cases, and the controlled-restart checks must pass. Answer at least four of five understanding questions correctly, including every safety-critical question. State a valid trade-off and limitation.

Reference answers are welcome. They do not complete the final questions or submit your work for you. Results describe learning in this exercise—not certification, hiring suitability, or proof of production correctness.
FREE MEMBERSHIP

Start with your Circle account.

Use your existing account, or sign up with Google or email. Your submitted decisions, configurations, and result are associated with your account. Private draft notes stay in your browser tab.

Get New Challenges ↗

Checking your membership…

No second mailing list. Starting this challenge does not subscribe you to marketing emails.

FOUNDING LEARNER PASS

Earn your next learning experience.

90 days

Complimentary access for the first 100 eligible accepted claims. Complete Challenge One, receive a Pass, and request your place. An administrator activates your access.

No payment card. No automatic renewal. No charge at expiry.

What is included and how the campaign works
The initial benefit is Recovery Transfer Studio: three deeper practice drills and a reusable review worksheet. Future simulations are announced separately. Your 90 days begin at activation—not registration or time spent waiting. One place per eligible participant; duplicate-account abuse may be reviewed. Reference-assisted practice qualifies. Newsletter signup, reviews, referrals, and social posts are not required.

Places are reserved in the order successful claim writes are accepted by the service, up to 100. A saved Pass does not reserve a place until you claim. When the allocation is full or closed, your learning result remains available. A revoked place is not automatically recycled. Your account displays exact activation and expiry times.

Explore the concepts behind the challenge.

Stay tuned for new simulations.

Subscribe for more design challenges and the AI Architecture Brief.

Get New Challenges ↗