Salesforce · PDI
Salesforce Certified Platform Developer I (PDI) Practice Tests
Validates the ability to design, develop, and deploy custom applications on the Salesforce Lightning Platform using Apex, Visualforce, and Lightning Components. Demonstrates proficiency in process automation, user interface development, testing, and deployment.
Exam Details
Practice Questions
600
≈ 10 practice exams
Duration
105 minutes
Passing Score
68%
Difficulty
AssociateLast Updated
Jun 2026
Topics Covered
Process Automation & LogicUser Interface (Visualforce & LWC)Developer FundamentalsTesting & DebuggingDeploymentData Modeling & ManagementSecurity & Access
Salesforce Certified Platform Developer I (PDI) Practice Exam Preparation
Use this PDI practice exam to prepare for Salesforce Certified Platform Developer I (PDI) with realistic questions, detailed explanations, and focused study modes. The practice bank includes 600 questions for Salesforce PDI, so you can review the exam steadily instead of relying on one long cram session.
As you practice, pay extra attention to recurring topics such as Process Automation & Logic, User Interface (Visualforce & LWC), Developer Fundamentals, Testing & Debugging, and Deployment. Start with short sessions to identify weak areas, then move into timed quizzes once your accuracy is consistent.
The explanations are especially useful when you want to connect exam wording to the responsibilities and scenarios described in the official certification guidance. Use the free preview first, then unlock the full question bank when you are ready to build a complete study routine.
Exam Domain Breakdown
Developer Fundamentals23%
Process Automation & Logic30%
User Interface25%
Testing, Debugging, and Deployment22%
Exam Overview
The Salesforce Certified Platform Developer I (PDI) credential validates a developer's ability to design, build, test, and deploy custom applications on the Salesforce Lightning Platform. It covers both declarative and programmatic development techniques, requiring demonstrated proficiency in Apex (Salesforce's proprietary Java-like language), Visualforce, Lightning Web Components (LWC), and Aura Components. Candidates must understand the platform's multi-tenant architecture, the Model-View-Controller (MVC) framework as applied to Salesforce, and governor limits that constrain resource usage in shared environments.
Beyond code, the exam tests knowledge of data modeling with standard and custom objects, SOQL and SOSL query languages, DML operations, process automation tools (such as Flow and approval processes), platform security (sharing rules, profiles, permission sets), and the full deployment lifecycle using Salesforce DX, Change Sets, and the Salesforce CLI. The PDI is considered the foundational developer credential in the Salesforce ecosystem and is a prerequisite stepping stone toward the Platform Developer II and other advanced technical certifications.
Who Should Take This Exam
This certification is designed for developers who have hands-on experience building custom applications on the Salesforce Lightning Platform—typically those with six months to two years of Salesforce development experience. Ideal candidates work in roles such as Salesforce Developer, Junior Developer, Technical Consultant, or Salesforce Administrator looking to move into a developer track. They should be comfortable writing Apex code, constructing Visualforce pages, and building Lightning Web Components in a professional or sandbox environment.
While developers are the primary audience, the broad scope of knowledge tested makes the certification valuable for Solution Architects, Technical Leads, and even experienced Administrators who want a deeper understanding of the platform's programmatic capabilities. No official prerequisite certification is required, though familiarity with Administrator and Platform App Builder concepts is strongly recommended.
Prerequisites
There are no mandatory prerequisite certifications for the PDI exam, but Salesforce recommends that candidates possess the equivalent knowledge covered by the Salesforce Certified Administrator and Salesforce Certified Platform App Builder exams before attempting this credential. A solid grasp of declarative automation tools—Flows, validation rules, formula fields, and approval processes—is essential, as the exam tests when to use declarative versus programmatic solutions.
On the technical side, candidates should have practical experience writing Apex classes, triggers, and unit tests; constructing SOQL and SOSL queries; and working with the Lightning Component framework. Familiarity with object-oriented programming principles (inheritance, polymorphism, collections) and relational database concepts (entity relationships, normalization) is assumed. Salesforce recommends completing the Trailhead Cert Prep: Platform Developer I trail, which consists of four modules covering Fundamentals, Database Modeling, Process Automation, and User Interfaces.
Exam Format
The Salesforce Certified Platform Developer I exam consists of 60 scored multiple-choice and multiple-select questions. Candidates are given 105 minutes to complete the exam. The passing score is 68%, meaning a candidate must correctly answer approximately 41 of the 60 questions. The exam is delivered through Pearson VUE and can be taken either at an authorized testing center or via online proctoring. The registration fee is $200 USD, with a retake fee of $100 USD.
Multiple-select questions require candidates to choose all correct answers from a list (typically two or three correct options out of five), and partial credit is not awarded—all correct choices must be selected. The exam is currently offered in English. Salesforce periodically updates the exam to reflect platform releases; candidates should download the current exam guide PDF from the official Salesforce developer certification site before studying to confirm the latest objective weights.
Skills Measured
- 1.Developer Fundamentals (23%): Understanding of multi-tenant architecture and its implications (governor limits, bulkification), the MVC pattern on Salesforce, use of standard and custom metadata types, Lightning Component framework architecture, and when to use declarative versus programmatic approaches to solve business problems.
- 2.Process Automation & Logic (30%): Writing Apex classes, triggers, and anonymous code; using collections (Lists, Sets, Maps); applying SOQL and SOSL for data retrieval; executing DML operations; understanding order of execution and trigger context variables; implementing platform events; identifying and avoiding common security vulnerabilities (SOQL injection, XSS); and building automation with Flow, approval processes, and Apex.
- 3.User Interface (25%): Developing Visualforce pages and controllers (standard, custom, and extension controllers); building Lightning Web Components and Aura Components; using the Lightning Data Service; applying component communication patterns (parent-child, event-based); and knowing when each UI framework is appropriate.
- 4.Testing, Debugging, and Deployment (22%): Writing Apex unit tests with meaningful assertions and achieving required code coverage (75% minimum for deployment); using the Developer Console, debug logs, and checkpoints for troubleshooting; deploying metadata using Change Sets, Salesforce DX, and the Salesforce CLI; and understanding sandbox types and their role in the development lifecycle.
Study Tips
- Download the official Salesforce Certified Platform Developer I Exam Guide PDF from developer.salesforce.com and use the domain weightings to prioritize study time—Process Automation & Logic (30%) and User Interface (25%) together account for more than half the exam.
- Complete all four Trailhead Cert Prep: Platform Developer I modules on Trailhead (Fundamentals & Database Modeling, Process Automation & Logic, User Interfaces, and Testing & Debugging), as they include scenario-based flashcards and direct links to the Apex Developer Guide sections most likely to be tested.
- Practice writing Apex in a Developer Edition org or Trailhead Playground daily—focus on bulk-safe triggers, SOQL inside loops (a common trap question), and writing test classes with System.assert() statements. The exam heavily tests recognition of code errors and governor limit violations.
- Study the order of execution for Salesforce record saves thoroughly (before triggers, validation rules, after triggers, workflow, etc.), as multiple questions test whether candidates can predict what happens when multiple automation tools interact on the same record.
- Use the Apex Developer Guide and Lightning Web Components Developer Guide on developer.salesforce.com as primary references. For LWC specifically, know the difference between @track, @api, and @wire decorators, and understand how components communicate via custom events versus public properties.
- Take at least two full-length timed practice exams from Focus on Force or Trailhead Superbadges before the real exam. Review every incorrect answer against the official documentation to understand the 'why,' not just the 'what.'
- Join the Trailblazer Community's Platform Developer I study group to ask scenario-based questions and access community-curated study notes. Many candidates report that community discussion of tricky governor limit and trigger context scenarios directly mirrors real exam questions.
Career Benefits
Earning the Salesforce Certified Platform Developer I credential significantly increases employability in the Salesforce ecosystem, which remains one of the fastest-growing segments of enterprise software. Certified Salesforce Developers in the United States earn average base salaries ranging from approximately $96,000 to $120,000 annually, with senior developers and architects commanding $145,000 or more. The certification provides a verifiable, vendor-recognized signal of competency that distinguishes candidates in a competitive job market and is frequently listed as a requirement or strong preference in Salesforce Developer, Technical Consultant, and Solution Architect job postings.
The PDI also serves as the gateway to more advanced Salesforce technical credentials, including the Salesforce Certified Platform Developer II, JavaScript Developer I, and Salesforce Architect certifications. Organizations that are Salesforce partners track certified headcount to maintain tier status, creating institutional demand for certified professionals. The broader Salesforce services market is projected to exceed $24 billion by 2029, ensuring sustained demand for skilled, credentialed platform developers across industries including financial services, healthcare, retail, and technology.
Sample Questions
5 sample questions with answers and explanations. The full bank has 600 questions, enough for 10 full-length practice exams.
Preview — answers shown1. A developer at AW Computing is building a Lightning Web Component that uses @wire to retrieve open support cases assigned to a service queue. A code reviewer identifies that the component template accesses wire result properties without null checks, causing errors during initial page load. What is the initial state of a @wire adapter result when the component first renders? (Select one!)
AThe wire result is an empty array that allows safe template iteration before data is provisioned
BThe wire result blocks component rendering until Salesforce returns a valid data payload
CThe wire result is null until the Lightning Data Service cache is populated with a server response
DThe wire result contains a data property set to undefined and an error property set to undefined
Explanation
When a component using the @wire service first initializes, the wire adapter immediately provisions the property with an object containing data set to undefined and error set to undefined. This initial empty state is provided synchronously before any network call is made. The wire service then checks the Lightning Data Service cache; if a matching entry is found, it emits the cached data without a server round trip. If no cache entry exists, a server request is made and the result is emitted when it arrives. Templates must handle this initial undefined state using conditional rendering directives or null-safe property access to avoid null reference errors on the first render. The wire service does not return null, provide an empty array by default, or block component rendering while waiting for data to arrive.
2. A developer at DreamHouse Realty has written a service class with several private helper methods containing complex discount calculation logic. A senior developer reviewing the code recommends adding unit tests that directly invoke these private methods to validate edge cases without changing the methods' declared visibility. Which annotation should the developer add to the private helper methods to enable this? (Select one!)
A@InvocableMethod
B@TestSetup
C@isTest
D@TestVisible
Explanation
@TestVisible allows test classes to access private and protected Apex members — methods, instance variables, and inner classes — without changing their declared visibility in the production class. Non-test code continues to see the members as private, preserving proper encapsulation. @isTest marks an entire class or method as test code that does not count against the org's Apex code storage limit; it cannot be applied to production methods to expose them. @TestSetup marks a special method inside a test class that runs once before all test methods to set up shared test data; it cannot be applied to methods in non-test classes. @InvocableMethod exposes an Apex method so it can be called from a Flow or via the REST API, which is entirely unrelated to controlling test visibility.
3. A developer at AW Computing needs to build an asynchronous job that must: accept a custom Apex wrapper class containing a list of Opportunity records as an input parameter, return a job identifier so the system administrator can monitor progress in the Apex Jobs UI, and trigger a second asynchronous job to send confirmation emails after the first job finishes. Which asynchronous Apex approach satisfies all three requirements? (Select one!)
AA @future method annotated with (callout=true) to support HTTP callouts
BQueueable Apex implementing the Queueable interface and enqueued via System.enqueueJob()
CScheduled Apex implementing the Schedulable interface with a CronTrigger expression
DBatch Apex implementing the Database.Batchable interface with a custom scope parameter
Explanation
Queueable Apex is the only asynchronous pattern that satisfies all three requirements simultaneously. Unlike @future methods, which are restricted to primitives and collections of primitives as parameters, Queueable jobs accept non-primitive types including sObjects and custom Apex classes, making it possible to pass a wrapper class containing Opportunity records. System.enqueueJob() returns an AsyncApexJob ID that administrators can track in the Apex Jobs UI, satisfying the monitoring requirement. Queueable jobs can also chain a subsequent Queueable by calling System.enqueueJob() from within the execute() method, enabling the confirmation email job to run after the first completes. @future methods cannot accept non-primitive parameters and return void with no job identifier. Batch Apex is optimized for processing large record volumes through start, execute, and finish phases and does not support the same flexible parameter passing or lightweight chaining model. Scheduled Apex runs on a time-based schedule and is not suited for on-demand sequential job orchestration.
4. A developer at Cloud Kicks declares an Apex class with the with sharing keyword. The class queries Contact records and returns them to a Lightning component for display. Users report that the component shows values for fields that their profiles restrict via field-level security settings. What is the most likely cause of this behavior? (Select one!)
ASOQL queries inside Apex automatically enforce field-level security when executed from a class declared with the with sharing keyword
BLightning Web Components automatically bypass Apex security context and expose all object fields to all users regardless of profile settings
CThe with sharing keyword should be replaced with without sharing to enforce field-level security on queried records
DThe with sharing keyword enforces only record-level sharing rules and does not enforce field-level security; Apex runs in system context and returns all queried fields regardless of the running user's FLS permissions
Explanation
The with sharing keyword controls only whether the running user's sharing rules are applied to determine which records are visible — it does not enforce field-level security. Apex code runs in system context by default, which grants access to all fields on accessible records regardless of the user's FLS profile settings. As a result, even a class declared with sharing will return the full set of queried fields to all callers. To enforce FLS, developers must use one of three approaches: add WITH SECURITY_ENFORCED to the SOQL query (which throws a QueryException if the user lacks access to any queried field), call Security.stripInaccessible() to silently remove inaccessible fields from results without an exception, or perform manual FLS checks using Schema describe methods before accessing individual field values. Replacing with sharing with without sharing would make the record-visibility behavior worse by also removing sharing rule enforcement, not better.
5. A developer at Cloud Kicks needs to implement a Record-Triggered Flow that automatically updates the Priority__c field on a Case record when the Status field changes to 'Escalated'. The developer wants to perform this update without consuming any DML statement budget. Which type of Record-Triggered Flow should the developer configure? (Select one!)
AScreen Flow with a record update element
BBefore-Save Record-Triggered Flow
CAfter-Save Record-Triggered Flow
DScheduled Record-Triggered Flow
Explanation
A Before-Save Record-Triggered Flow runs before the record is committed to the database and can modify fields on the triggering record without consuming any DML statements. This makes it the most efficient option for updating fields on the same record being saved. An After-Save Record-Triggered Flow runs after the record is committed, meaning any updates to the triggering record's fields would consume an additional DML statement. Scheduled Flows run at a future time and do not fire synchronously during the record save operation. Screen Flows require user interaction and are not appropriate for fully automated field updates triggered by a record change.
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