Private identity
An anti-bot check and a passkey create your pseudonymous key. We ask for no email, password, or social profile and use no cookies.
CLUB QUIZ · COURSE CHALLENGE 02
Prove you can build LLM systems.Then prove it under pressure.
A competitive challenge maintained by working professionals. 2,048 private questions cover all 93 lessons; every attempt preserves difficulty while rewarding sound decisions and real speed.
PUBLIC PRACTICE · 5 RETIRED QUESTIONS
Try the format before competing
This is one local practice run. It uses questions outside the active bank, never enters the leaderboard, and creates no signed proof.
Zero cookies · no network · saved in this browserPractice completed
Illustrative score
- Accuracy
- Total time
Retired-question review
COMPETITIVE ATTEMPT
One edition. One attempt. Verifiable evidence.
Open practice does not consume your attempt. The official challenge only requires a pseudonymous passkey. The result stays private unless you later choose to attribute it to a profile.
Preparing the verified challengeChecking the edition, private passkey, and attempt state…
We cannot continue yet
STEP 1 · PARTICIPATION KEY
Create a private passkey
It creates no account and asks for no email. The passkey prevents this credential from repeating the edition.
Zero cookies. The passkey reveals no name, email, or biometrics; authorization lives only in this tab.
Private anti-bot checkIt runs before the passkey and is not stored with your attempt.
STEP 2 · ONE ATTEMPT
Your edition is ready
20 private questions, delivered one at a time. You cannot restart this edition. You may resume while time remains.
PRIVATE PASSKEY
- QUESTIONS
- 20
- TIME
- 30 min
- BANK
- Speed weighs heavily when your answer is correct
- Four questions are expert level
- Server-side timing and correction
- After finishing, see each miss and the exact lesson
Question 1/20
Edition time--:--Response time00:00.0
Select one answer.
Displayed time is informative; the authoritative timestamp is computed by the server.
SIGNED EVIDENCE
Verifiable result
0PTS
- Accuracy
- Total time
- Correct
Result by competency
PRIVATE REVIEW
Your misses, linked to the exact lesson
This review is private and opens only with your passkey. It never appears in the public proof, ranking, or certificate.
ACHIEVEMENT UNLOCKED
Take it to your professional profile
Your result clears the required level. Download the verifiable certificate or open Licenses & certifications; the fields are copied so you only need to paste them.
CERTIFICATE IDENTITY REQUIRED
Link your @handle to issue it
Your private proof is already valid. The named PDF is generated only after you publicly attribute the result to a verified social profile.
Ed25519
HOW IT WORKS
Speed matters, but it cannot hide mistakes.
Private, variable questions
Receive 20 questions rotating across eight competencies and four tiers, including four expert problems. Order and options change.
Server-side timing
Questions arrive one at a time. The server measures each response, and speed also matters when you are correct.
You choose attribution
The result creates an Ed25519 receipt that is private by default. Clear the required level to unlock a certificate, add it to LinkedIn, or share a CTA result card.
VERIFIED LEADERBOARD
Only results their authors choose to sign with a profile.
The leaderboard is rebuilt from D1 on every publication. It never shows anonymous participants or profiles without consent and moderation.
RankProfessionalScoreAccuracyProof
01
The new edition is open. Its first approved result will take this place.
Enter the official challenge →CURATED IN PUBLIC
The course improves through PRs. Active answers never leave the private system.
Professionals propose lessons, labs, sources, and questions in the open repository. Every accepted contribution preserves authorship and its GitHub profile. The web edition is generated from that reviewed knowledge; competitive solutions and active keys stay private.
What is public
Curriculum, labs, quality criteria, history, sources, and authorship for every contribution.
What stays private
Active-bank keys, per-attempt selection, abuse signals, and correction material that is still in use.
What you can prove
Edition, score, accuracy, speed, question-set hash, curators, and cryptographic signature.
Important questions
Can I repeat the official challenge?
Not with the same passkey in one edition. Someone could create another credential; a passkey proves control of a key, not universal human identity. The same social profile cannot publish two results either.
Why is there an open practice run?
It lets you test the format and scoring without spending the competitive attempt. It uses five retired questions outside the active bank.
Do you use cookies or your own fingerprint?
We use no cookies and create no persistent fingerprint. Authorization lives in sessionStorage, and D1 stores no IP or user-agent. Turnstile processes transient anti-bot signals without pre-clearance.
Can random fast answers win?
No. A wrong answer scores zero, and a minimum level of correct answers is required to qualify for the leaderboard.
Can I add the achievement to LinkedIn?
Yes. Clear the required level to receive a PDF certificate, credential ID, and verifiable URL. The button opens LinkedIn’s official Licenses & certifications form and lets you copy every field.