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Official specifications published by Salesforce
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120 min
60
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Take the MuleSoft Certified Developer - Level 1 MAINTENANCE exam
CERTIFIED-MULESOFT-DEVELOPER-I Exam Topics and Domains
CERTIFIED-MULESOFT-DEVELOPER-I is organized into 12 weighted domains. Expect to work with Anypoint Platform, Anypoint Studio, API Manager, DataWeave 2.0, and more.
1
Explaining Application Network Basics
MuleSoft IT Delivery Gap Solution
IT Delivery Gap
- Explain MuleSoft's proposal for closing the IT delivery gap
- Describe the role and characteristics of the modern API
- Describe the purpose and roles of a Center for Enablement (C4E)
API-Led Connectivity Fundamentals
API Terminology and Concepts
- Define and describe the benefits of API-led connectivity and application networks
- Define and correctly use the terms API, API implementation, API interface, API consumer, and API invocation
HTTP Protocol and Anypoint Platform
HTTP Protocol BasicsAnypoint Platform Components
- Describe the basics of the HTTP protocol and the characteristics of requests and responses
- Describe the capabilities and high-level components of Anypoint Platform for the API lifecycle
2
Designing and Consuming APIs
RAML API Definition
RAML BasicsRAML ParametersConsuming APIs with RAML
- Describe the lifecycle of the modern API
- Use RAML to define API resources, nested resources, and methods
- Identify when and how to define query parameters vs URI parameters
- Use RAML to define API parameters, requests, and responses
- Define and use reusable data types and format-independent examples
- Read a RAML spec and formulate RESTful requests with query parameters and/or headers
3
Accessing and Modifying Mule Events
Mule Event Structure
Mule Event Data StructureEvent Transformation
- Describe the Mule event data structure
- Use transformers to set event payloads, attributes, and variables
- Write DataWeave expressions to access and modify event payloads, attributes, and variables
- Enrich Mule events using target parameters
4
Structuring Mule Applications
Application Configuration
Property Placeholders and Global ConfigurationsFlow Structure and Data Persistence
- Parameterize an application using property placeholders
- Define and reuse global configurations in an application
- Break an application into multiple flows using private flows, subflows, and the Flow Reference component
- Specify what data (payload, attributes, variables) is persisted between flows when a Flow Reference is used
- Specify what data persists when a Mule event crosses a connection boundary
- Specify what data exists before and after a call to an external resource
5
Building API Implementation Interfaces
APIkit Implementation
Manual and APIkit REST Interfaces
- Manually create a RESTful interface for a Mule application
- Generate a REST Connector from a RAML specification
- Describe the features and benefits of APIkit
- Use APIkit to create implementation flows from a RAML file
- Describe how requests are routed through flows generated by APIkit
6
Routing Events
Event Routing Components
Choice and Scatter-Gather RoutersData Validation
- Use the Choice router to route events based on conditional logic
- Use the Scatter-Gather router to multicast events
- Validate data using the Validation module
7
Handling Errors
Error Handling Mechanisms
Default and Custom Error HandlingMule Error Object and Custom Errors
- Describe the default error handling in a Mule application
- Define a custom global default error handler and identify usage situations
- Compare and contrast On Error Continue and On Error Propagate scopes
- Create one or more error handlers for a flow
- Use the Try scope to specify error handlers for event processors
- Describe the data structure of the Mule Error object
- Map errors to custom application errors
8
Transforming Data with DataWeave
DataWeave Fundamentals
DataWeave Scripts and FunctionsDataWeave Variables, Modules, and TypesAdvanced DataWeave
- Write DataWeave scripts to convert JSON, XML, and Java data structures to different formats
- Use DataWeave functions
- Define and use DataWeave variables, functions, and modules
- Define and use custom data types
- Apply correct DataWeave syntax to coerce data types
- Apply correct DataWeave syntax to format strings, numbers, and dates
- Call Mule flows from a DataWeave script
9
Using Connectors
Database Connectivity
Database Connector
- Retrieve data from a Database using the Database connector
- Create parameterized SQL queries for the Database connector
REST and SOAP Web Services
HTTP and REST ConnectorsSOAP Web Services
- Retrieve data from a REST service using HTTP Request or a REST Connector
- Use a Web Service Consumer connector to consume SOAP web services
- Use the Transform Message component to pass arguments to a SOAP web service
File and Messaging Connectors
File OperationsJMS Messaging
- List, read, and write local files using the File connector
- List, read, and write remote files using the FTP connector
- Use the JMS connector to publish and listen for JMS messages
10
Processing Records
Collection Processing
For Each ScopeBatch Processing
- List and compare methods for processing individual records in a collection
- Explain how Mule events are processed by the For Each scope
- Use the For Each scope to process records
- Explain how Mule events are processed by the Batch Job scope
- Use a Batch Job with Batch Steps and a Batch Aggregator to process records
Flow Triggering and Data Persistence
Schedulers and ListenersWatermarking and Object Store
- Use the Scheduler component to trigger a flow
- Use connector listeners to trigger flows
- Describe the features, benefits, and process to use watermarking
- Describe automatic watermarking vs manual watermarking
- Use connectors with automatic watermarking capabilities
- Persist data between flow executions using the Object Store
11
Debugging and Troubleshooting Mule Applications
Debugging Techniques
Breakpoints and Dependency Management
- Use breakpoints to inspect a Mule event during runtime
- Install missing Maven dependencies
- Read and decipher Mule log error messages
12
Deploying and Managing APIs and Integrations
Application Deployment
CloudHub Deployment
- Package Mule applications for deployment
- Deploy applications to CloudHub
- Use CloudHub properties to ensure deployment success
API Management and Security
API Proxies and AutodiscoveryAPI Policies and SLA Tiers
- Create and deploy API proxies
- Connect an API implementation to API Manager using autodiscovery
- Use policies, including client ID enforcement, to secure an API
- Create SLA tiers and apply SLA based policies
How do I earn this certification?
Passing CERTIFIED-MULESOFT-DEVELOPER-I earns the Salesforce Certified MuleSoft Developer certification. It sits in the MuleSoft Developer track.
Current Level Exams
Next Level Options
- Mule-Dev-202 - Salesforce Certified MuleSoft Developer IIFor seasoned developers working on production-ready Mule applications in DevOps environments
- Mule-Arch-201 - Salesforce Certified MuleSoft Platform ArchitectFor architects defining organization's Anypoint Platform strategy
- Mule-Arch-202 - Salesforce Certified MuleSoft Platform Integration ArchitectFor architects translating requirements into integration interfaces
Alternative Paths
Mule-Dev-202 - Salesforce Certified MuleSoft Hyperautomation DeveloperDevelop hyperautomation solutions across Salesforce and MuleSoft products
Practice with Precision
The PlanetCert Simulator mirrors the real exam environment with authentic questions and timed pressure.
How to study for this exam?
The most effective way to prepare for CERTIFIED-MULESOFT-DEVELOPER-I is by using the PlanetCert Simulator to practice questions and review detailed explanations.
What's changed on this exam?
Current Status
- ACTIVE
- Last content update: 2025-10-11
Updates
- Mule Runtime 4.6 4.6 Java 17 support now part of platform knowledge • Release date: 2024-Q4
- DataWeave 2.0 2.x Core exam topic with continuous enhancements • Release date: ongoing
- Anypoint Platform latest Platform components and API lifecycle management central to exam • Release date: continuous
Who should take this exam?
This exam is typically taken by Developers working on basic Mule 4 projects and Integration developers.
- Experience working on basic Mule 4 projects with guidance and supervision
- Familiarity with Anypoint Platform and Anypoint Studio
- Basic understanding of API-led connectivity
- Knowledge of DataWeave 2.0
- Experience with integration patterns