Interactive courses
Learn Jev by building, not by reading
Three courses that take you from your first request to production systems that handle the model’s documented sharp edges. Every lesson has something you manipulate in the browser.
Jev Foundations
Start here. Build an accurate mental model of what a System One model is, learn the three primitives by composing them in the browser, and ship a working ticket triage endpoint.
- freeWhat You're Actually Calling
- freeThe Three Primitives
- paidReading Probabilities and Confidence
- paidWriting Atomic Questions
- paidProject: Ticket Triage
Patterns in Production
Speculative fan-out, confidence-gated routing, composite scoring, and intent routing — implemented properly, with the failure modes each one hides.
- freeSpeculative Fan-Out
- paidConfidence-Gated Routing
- paidComposite Scoring
- paidIntent Routing
- paidProject: Moderation Pipeline
Jagged Edges
The failure modes that bite in production: numeric blindness, date comparison, context rot, adversarial state, and the structural invariants that simply do not hold.
- freeIt Is Not a Calculator
- paidDates, Times, and Ordered Quantities
- paidContext Rot and Large State
- paidThe Invariants That Don't Hold
- paidAdversarial State
Pricing
Free
$0
Enough to decide whether Jev fits your problem.
- ✓Three free lessons, one per course
- ✓The question builder and confidence playground
- ✓Every guide on the site
All courses
$79one time
Every lesson across all three courses, plus updates as Jev ships new versions.
- ✓15 lessons, beginner to advanced
- ✓All interactive exercises and graders
- ✓Three mini-projects with full source
- ✓Free updates for new Jev releases
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