Assessments

Tests that move with you.

Adaptive questions that recalibrate after each answer. Pass and the bar rises; struggle and it listens. In ten minutes you get a credible level – and proof of where you got it.

Adaptive Assessment

Advanced

Given a React component that renders a list of 10,000 items, which optimization strategy would you apply first?

Difficulty7/10

4/8

How it works

Three steps to a verified score.

Question

The system presents a calibrated question. Your response is analyzed for correctness, speed, and confidence.

Adapt

The algorithm adjusts difficulty in real-time. Correct answers raise the bar. Mistakes trigger focused review at a lower level.

Certify

When enough data converges on your true ability, the assessment ends. Your score becomes an immutable credential.

Assessment types

Four assessments. One goal: truth.

React · DiagnosticIn Progress

Difficulty Level

Beginner

Intermediate

Advanced

Q4 of 10

When should you use useCallback vs useMemo?

10 questions · ~15 min

Diagnostic

Rapid skill-level detection. The system pinpoints your current proficiency in under 10 minutes, identifying strengths and gaps.

Competency Assessment

React Hooks75%

Fundamentals92%

Patterns78%

Performance65%

Adaptive difficulty

Competency

Prove mastery at a specific level. Pass the threshold and your competency is recorded as verifiable evidence in your passport.

Lemma Certified

React

84%Passed

Issued Apr 8, 2026

Verified credential

Certification

Formal credential for your passport. A comprehensive assessment that evaluates depth and breadth, producing a signed certificate.

JavaScript Benchmark

Your Percentile

Top 12%

0%100%

Ahead of 88% of candidates

Updated weekly

Benchmark

Compare your ability against the global population. See exactly where you rank and track your percentile over time.

Start proving what you know.

Early access is rolling out for individuals and teams. No credit card, no PDFs – just the things you made, made visible.