How to Pass the MuleSoft Certified Developer (Level 1) in 2026: Study Plan

The MuleSoft Certified Developer credential (formerly "MCD – Level 1 (Mule 4)," now branded Salesforce Certified MuleSoft Developer) proves you can build, test, and deploy Mule 4 applications and APIs on Anypoint Platform. It's a broad, hands-on-flavored exam where DataWeave 2.0 transformations and core Mule application-building carry the most weight. Here's how to pass it.

The objectives and their weights

The exam guide breaks the exam into weighted topics — the transformation and application-building areas dominate:

| Topic | Weight |
|---|:---:|
| Accessing and Modifying Mule Events | 10% |
| Structuring Mule Applications | 10% |
| Using Connectors | 10% |
| Processing Records | 10% |
| Transforming Data (DataWeave) | 10% |
| Designing APIs | 8% |
| Routing Events | 8% |
| Handling Errors | 8% |
| Creating Application Networks | 7% |
| Building API Implementation Interfaces | 7% |
| Deploying and Managing APIs and Integrations | 7% |
| Debugging and Troubleshooting | 5% |

No single topic runs away with the exam, but DataWeave, connectors, record processing, and application structure together are the core — and DataWeave questions expect you to compute exact outputs, so you can't fake fluency.

The study plan (4–6 weeks) — build in Anypoint Studio

You learn Mule 4 by building flows. Work in Anypoint Studio 7 throughout.

Week 1 — Anypoint Platform and Mule events. The platform (Design Center, Exchange, API Manager, Runtime Manager), the anatomy of a Mule application, and the Mule event (message, attributes, variables) — how to access and modify it. This is foundational to everything.

Week 2 — DataWeave 2.0 (the make-or-break skill). Learn to read and write DataWeave: mapping, map/filter/reduce, selectors, type coercion, and functions. Practice computing exact outputs — the exam gives you input and expects the precise result. Do not skip this.

Week 3 — Building applications: connectors, routers, records. Connectors (HTTP, Database, File), routers (Choice, Scatter-Gather, For Each), and batch/record processing. Then error handling (On Error Continue vs. Propagate, error types, try scopes).

Week 4 — APIs and deployment. RAML/API design, building API implementations, API-led connectivity (application networks), and deploying to CloudHub/Runtime Manager. Then timed, full-length practice.

Currency: Mule 4, not Mule 3

The exam tests Mule 4 / DataWeave 2.0 / Anypoint Studio 7. Mule 3 concepts — MEL, inbound/outbound properties, flow/session variables, DataWeave 1.0 — are legacy and not on this exam; they appear only as distractors. Make sure your study material is Mule 4.

Exam logistics

• 60 multiple-choice questions (plus up to 5 unscored) in 120 minutes.
• Passing score: 70%.
• Cost: $200 USD (retake fee applies).
• Maintenance: the credential is kept current by completing a free annual maintenance module on Trailhead — not a paid re-exam.

The practice-test loop

This exam rewards knowing exactly how Mule 4 and DataWeave behave. Timed questions with explanations build that. The loop:

1. Take a timed set on the topic you're studying; for DataWeave items, compute the output yourself.
2. Review every question — including correct ones — and read why each distractor is wrong.
3. Repeat until you're consistently scoring well above 70% on fresh questions.

CertBase's MuleSoft Developer bank is built for that: Mule 4 / DataWeave 2.0 questions written to the exam objectives — with DataWeave items that compute exact outputs and legacy Mule 3 only as distractors — each with a detailed explanation of the correct answer and every distractor. Rebuilt and independently verified in July 2026, one-time purchase, lifetime access, free samples on the exam page, and a 30-day money-back guarantee.

Are you ready?

• ✅ You can read and write DataWeave 2.0 and predict exact outputs
• ✅ You know the Mule event model (attributes vs. variables) cold
• ✅ Connectors, routers, and error handling are second nature
• ✅ You never confuse Mule 4 with legacy Mule 3 concepts
• ✅ You're scoring well above 70% on fresh, timed questions

FAQ

Has the MuleSoft Developer Level 1 exam changed? The credential was renamed to "Salesforce Certified MuleSoft Developer" in Salesforce's 2025 certification rebrand — it's the same Mule 4 exam and content, just a new name. There's no newer version or "Mule 5" exam.

How many questions and what's the passing score? 60 scored multiple-choice questions (plus up to 5 unscored) in 120 minutes, passing at 70%.

Do I need to know DataWeave to pass? Yes — DataWeave 2.0 is central, and questions expect exact outputs. It's the single highest-leverage thing to master.

How do I keep the certification? Complete the free annual certification-maintenance module on Trailhead. There's no paid maintenance exam; miss the deadline and the credential expires.