Salesforce Developer
Salesforce Certified Platform Developer I
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ExploreAbout this exam
Salesforce Certified Platform Developer is a Salesforce credential for developers who build on the Lightning Platform. Per Salesforce's own description, certified Platform Developers "understand how to develop and deploy custom business logic and custom interfaces using the programmatic capabilities of the Lightning Platform," and they can "extend the Lightning Platform using Apex and Visualforce." That makes it a code-centered credential rather than a declarative one: it sits alongside the Platform App Builder certification, which Salesforce describes as covering declarative customization, and below Platform Developer II, which Salesforce describes as being for developers who are experts in advanced programmatic capabilities and who use data modeling to build complex business logic and interfaces.
The credential is aimed at developers who write and deploy Apex and Visualforce rather than admins who configure. Salesforce does not publish the exam's item count, time limit, fee, passing score, or a weighted topic breakdown on the certification page, so treat those details as things to confirm at registration rather than assume.
For preparation, Salesforce points candidates to two official resources: a curated Trailmix, "Prepare for Your Salesforce Platform Developer Certification," and a Trail, "Study for the Salesforce Platform Developer Certification," which uses interactive study tools. Working through both in that order gives you a structured path before you book a seat.
This page is independent study material and is not affiliated with or endorsed by Salesforce.
What you'll study
About Salesforce Developer preparation
What does the Platform Developer I certification actually certify?
Salesforce states that certified Platform Developers understand how to develop and deploy custom business logic and custom interfaces using the programmatic capabilities of the Lightning Platform, and that they can extend the platform using Apex and Visualforce. Expect the exam to test code-level development on the platform, not point-and-click configuration.
How many questions are on the exam, and how long do I get?
The Salesforce certification page for Platform Developer does not publish an item count or a time limit. Do not rely on figures from older study guides or forum posts, since exams are revised. Confirm the current format on the registration and scheduling pages before you plan your pacing.
What does the exam cost, how long is the certification valid, and what is the retake policy?
None of these are stated on the Platform Developer certification page. Fees, validity periods, and retake rules are set by Salesforce and can change, so check the registration flow and the certification help documentation at the time you book rather than budgeting from secondhand numbers.
What is the passing score?
Salesforce does not list a passing score on the Platform Developer credential page. Scaled scores vary by exam and are subject to revision, so aim for broad competence across programmatic development rather than chasing a specific percentage. The score report you receive after testing will show your section-level results.
What is the best study order?
Salesforce recommends starting with the curated Trailmix, "Prepare for Your Salesforce Platform Developer Certification," which is designed to get you exam-ready. Then move to the Trail, "Study for the Salesforce Platform Developer Certification," which uses interactive study tools. Doing the Trailmix first builds coverage; the Trail then tests retention.
How hard is the exam?
Salesforce publishes no pass rate or difficulty rating for this credential, so any difficulty claim you read elsewhere is anecdotal. What the source does say is that the target audience develops and deploys custom business logic and interfaces with Apex and Visualforce, which implies hands-on coding fluency rather than recognition-level recall.
Do I need to know Apex and Visualforce before I start?
Both are named explicitly in the credential description, so plan on comfort with each. Apex underpins custom business logic and deployment; Visualforce is named as an extension path for custom interfaces. Build working samples in a developer org rather than only reading about syntax, because the study Trail assumes applied practice.
Should I earn Platform App Builder first?
It depends on your background. Salesforce lists Platform App Builder as a related certification covering declarative customization, so it is a natural fit for admins moving toward development. If you already write code, going straight at the programmatic credential is reasonable. The two overlap in platform fundamentals but diverge sharply afterward.
How is Platform Developer I different from Platform Developer II?
Salesforce describes Platform Developer II as being for developers who are experts in advanced programmatic capabilities and who use data modeling to develop complex business logic and interfaces. Platform Developer I is the entry point into programmatic development; II assumes you already have that foundation and adds depth and complexity.
How do I keep the credential current?
Salesforce's certification navigation lists resources for maintaining certifications and for verifying them. Use the maintain path to review recent product releases and complete any required maintenance modules, and use the verify path when an employer asks you to prove the credential is active.