Salesforce Certified MuleSoft Developer I (MCD Level 1) - Practice Questions & Exam Prep

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What the certification is

Certified MuleSoft Developer I holders are entry-level developers who can build, debug, and deploy basic Mule applications in a DevOps environment. It is the foundational MuleSoft credential and the prerequisite the rest of the developer track assumes.

The exam (code Mule-Dev-201) covers Anypoint Studio fundamentals, API-led connectivity, designing and consuming APIs with RAML and Anypoint Exchange, transforming data with DataWeave, structuring applications with flows and subflows, error handling, and deploying to CloudHub.

Questions are scenario-based rather than pure recall: you are typically shown a Mule application requirement and asked which connector, scope, DataWeave expression, or error-handling configuration satisfies it - so the credential signals you can actually build and operate Mule 4 applications, not just memorize definitions.

Developers with around six months of hands-on Anypoint Platform experience who want to validate core Mule 4 skills. It is the natural first MuleSoft certification: it has no prerequisites, and Developer II, Platform Architect, and Integration Architect all build on the fundamentals it covers.

Exam format

Questions
60
Duration
120 minutes
Passing score
70%
Cost
$200
Format
60 scored multiple-choice / multiple-select questions (plus up to 5 unscored); proctored onsite or online.

Domains & objectives

  • Creating application networks
  • Designing & consuming APIs
  • Accessing & modifying Mule events
  • Structuring Mule applications
  • Handling errors

Sample questions

Which DataWeave operator extracts a single value from a complex object using a path expression?

  • A. map
  • B. filter
  • C. the dot/index selector
  • D. reduce

Correct: C

The selector (e.g. payload.user.name) navigates object/array structure to read one value. map and filter transform collections; reduce folds a collection to a single accumulated value - none of those are path selectors.

In a Mule flow, which scope retries a failing operation a bounded number of times before propagating the error?

  • A. Until Successful
  • B. Async
  • C. Cache
  • D. For Each

Correct: A

Until Successful retries its enclosed processors up to a configured maxRetries with a delay, then throws if still failing. Async runs work on another thread, Cache stores results, and For Each iterates - none provide bounded retry semantics.

A flow has an On Error Continue scope handling a VALIDATION error. After the handler runs, what does the owning flow return to its caller?

  • A. The original error is re-thrown to the caller
  • B. The result the error handler produced, as a successful response
  • C. A null payload and an HTTP 500 status
  • D. Nothing - the flow stops without returning

Correct: B

On Error Continue treats the error as handled: the flow completes successfully and returns whatever the handler produced, so the caller sees a normal response, not an error. On Error Propagate is the scope that re-throws to the caller - that is the key distinction the exam tests between the two error scopes.

Frequently asked questions

How many questions are on the MuleSoft Developer I exam?
The Salesforce Certified MuleSoft Developer I exam has 60 scored multiple-choice questions and a 120-minute time limit; the passing score is 70%.
How much does the MuleSoft Developer I certification cost?
Registration is $400 USD. MulePrep's full practice bank is a separate $5.99 one-time purchase with lifetime access.
Are there prerequisites for MuleSoft Developer I?
No. Developer I is the entry-level MuleSoft developer credential, so you can take it without holding any other certification first. It is, however, the prerequisite for Developer II, so most people start here.
How long does it take to prepare for MuleSoft Developer I?
Most candidates with around six months of hands-on Anypoint Platform experience prepare in four to eight weeks of part-time study. Timed practice on Anypoint Studio fundamentals, DataWeave, flow design, and error handling matters more than raw hours, because the exam is scenario-based rather than recall-based.
Is MulePrep affiliated with Salesforce or MuleSoft?
No. MulePrep is an independent study resource. All practice questions are original; it is not endorsed by or connected to MuleSoft or Salesforce.

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