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Program overview

Web Experimentation Core (Developer) Exam Blueprint

The Web Experimentation Core (Developer) exam has 30 multiple-choice questions, one scenario and one rationale question. You have 75 minutes and need 70% overall to pass. It covers 7 domains: Web Experimentation Fundamentals, Audience Targeting and Personalization, Experiment Analytics and Results Interpretation, Feature Flags and Server-Side Experimentation, Advanced Experimentation Techniques, SDK Architecture and Technical Implementation and Statistical Foundations and Data Analysis. You need Optimizely Foundations first. Certifications are valid for about one year.

This exam is for
Developer
Implements solutions — builds and ships production code

You build and ship — implementing features with the SDKs and APIs, configuring the platform as code, and debugging real integrations. This exam confirms hands-on implementation skill: knowing the actual API surface, SDK patterns, and development workflows, not just the underlying concepts.

Typical rolesFront-end EngineersBack-end EngineersFull-stack Engineers
Question types & scoring
MCQScenarioRationale
Count3011
Min pass≥70%≥65%≥65%
70% overall to pass · 32 items total
Domains
7
weighted areas
Time limit
75 min
 
Attempts
3
per quarter
Retake
2 days
cooldown if not passed

Web Experimentation Fundamentals

25% weight~8 questions
Topics covered:A B TestingMultivariate TestingVisual EditorExperiment CreationExperimentationExperiment Types Comparison

Audience Targeting and Personalization

15% weight~5 questions
Topics covered:Audience TargetingUser ContextVisitor GroupsReal Time SegmentsContent PersonalizationBehavioral TargetingGeo TargetingCustom Attributes

Experiment Analytics and Results Interpretation

3% weight~1 questions
Topics covered:Experiment AnalyticsStatistical AnalysisConfidence IntervalsResults InterpretationData VisualizationGoal ConfigurationEvent TrackingAnalytics IntegrationConversion TrackingRevenue Metrics

Feature Flags and Server-Side Experimentation

20% weight~6 questions
Topics covered:Feature FlagsProgressive RolloutSdk IntegrationServer Side ExperimentationKill SwitchesEnvironment ManagementFeature VariablesFlag Evaluation

Advanced Experimentation Techniques

5% weight~2 questions
Topics covered:CmabMachine LearningForced DecisionsMutual Exclusion GroupsExperiment PrioritizationTraffic AllocationResults DocumentationProgram Management

SDK Architecture and Technical Implementation

22% weight~7 questions
Topics covered:Sdk ArchitectureSnippet DeploymentClient Side SnippetPerformanceEdge DeliveryNetwork ConfigurationLoggingDeveloper ExperienceOptimistic Decisions

Statistical Foundations and Data Analysis

10% weight~3 questions
Topics covered:Stats EngineStatistical AnalysisHypothesis TestingConfidence IntervalsFunnel Analysis