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Salesforce Platform Developer I ✓ Updated May 2026

Salesforce Build Applications Programmatically on the Salesforce Platform

Exam Code: DEX-450
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About the DEX-450 Exam

The DEX-450 exam, officially titled 'Build Applications Programmatically on the Salesforce Platform,' is a critical credential for aspiring Salesforce Platform Developers. Offered by Salesforce, this exam validates a candidate's ability to design, build, and deploy custom applications using Apex, Visualforce, and Lightning components within the Salesforce ecosystem. It goes beyond declarative development, requiring hands-on skills in writing code, managing data, and implementing business logic programmatically. Passing this exam demonstrates a deep understanding of Salesforce's programmatic capabilities, making it a key milestone for those pursuing the Platform Developer I certification.

This exam is specifically designed for developers who have practical experience with Salesforce development tools and languages. It covers essential topics such as Apex triggers, classes, and test methods, as well as Visualforce pages and Lightning Web Components. Candidates must also understand data modeling, security, and deployment processes. The DEX-450 is not for beginners; it assumes familiarity with Salesforce fundamentals and object-oriented programming concepts. Real-world use cases include automating complex business processes, integrating with external systems, and building custom user interfaces that extend Salesforce's native functionality.

Earning the DEX-450 certification is highly valued in the industry, as it signals to employers that a developer can handle sophisticated, code-driven solutions on the Salesforce platform. With over 150,000 companies using Salesforce, skilled developers are in high demand to create tailored applications that drive business efficiency. This exam is a stepping stone to advanced roles like Senior Developer or Technical Architect, and it often leads to higher salaries and career advancement. By mastering the content of DEX-450, developers position themselves as experts capable of solving real-world business challenges through programmatic innovation.

Who Should Take the DEX-450 Exam?

The DEX-450 exam is intended for Salesforce developers with at least 6 months of hands-on experience building applications on the platform. Ideal candidates include software developers, system integrators, and IT professionals who work with Apex, Visualforce, and Lightning components. Prerequisites include a solid understanding of object-oriented programming, familiarity with Salesforce basics like objects and security, and completion of the Salesforce Platform Developer I training module. This exam is not for administrators or declarative developers without coding background.

Topics Covered in DEX-450

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Apex programming language fundamentals and syntax
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Apex triggers and trigger design patterns
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Visualforce pages, controllers, and custom components
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Lightning Web Components (LWC) development
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Data modeling with custom objects and fields
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SOQL and SOSL query languages
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Apex testing and code coverage requirements
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Security, sharing, and deployment considerations

Preparation Tips for DEX-450

Practice writing Apex triggers and classes in a Salesforce Developer Edition org, focusing on bulk-safe patterns and governor limits.
Master SOQL and SOSL queries by creating complex queries with relationships, aggregate functions, and filters.
Build sample Lightning Web Components using the Salesforce CLI and VS Code to understand lifecycle hooks and data binding.
Create thorough test classes that achieve at least 75% code coverage, covering positive, negative, and bulk scenarios.
Review the official Salesforce Platform Developer I exam guide and take practice tests to identify weak areas.
Study Visualforce page controllers and custom components, especially for handling user input and data display.

Frequently Asked Questions — DEX-450

What is the passing score for the DEX-450 exam?

The DEX-450 exam requires a passing score of 68% to earn the Salesforce Platform Developer I certification. The exam consists of 60 multiple-choice questions, and you have 105 minutes to complete it. Scores are reported immediately after submission, and you can retake the exam after 14 days if needed.

How much does the DEX-450 exam cost?

The DEX-450 exam fee is $200 for the first attempt, with free retakes available if you purchase the exam voucher through Salesforce's certification program. Retakes after the first free attempt cost $100 each. Salesforce also offers discounts for students and members of certain partner programs.

What programming languages are tested on the DEX-450 exam?

The DEX-450 exam focuses on Apex (Salesforce's proprietary Java-like language), Visualforce (a markup language for building custom pages), and Lightning Web Components (JavaScript-based components). You should also be comfortable with SOQL and SOSL for querying data, as well as basic HTML and CSS for Visualforce and LWC styling.

How many questions are in the ExamsTree DEX-450 study guide?
The ExamsTree DEX-450 PDF study guide contains 201+ practice questions with detailed answer explanations, all mapped to the official Salesforce exam objectives.

Why Choose ExamsTree?

ExamsTree DEX-450 Study Guide is developed by experienced certification professionals with deep knowledge of Salesforce technologies. Our team thoroughly researches each exam domain to provide comprehensive, accurate coverage.

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Exam Details
Vendor Salesforce
Questions 201+
Format PDF
Updated 5/24/2026
Cert Platform Developer I
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