Apex ERP Integration Middleware Resume Project Example
An Apex integration middleware that syncs orders and inventory with an external ERP via REST callouts, Platform Events for retries, and Named Credentials for secure, auditable connectivity.
Free to start · No credit card required
JORDAN KIM
Salesforce Developer
Project
ERP integration
Retry-safe- Synced Opportunity orders to ERP via REST callouts.
- Used Platform Events for async retries on transient failures.
- Secured endpoints with Named Credentials and structured logging.
Why this project is valuable
Integration depth
ERP sync shows callout patterns, error handling, and async retry design hiring teams need.
Good ATS coverage
Supports Apex REST callouts, Platform Events, Named Credentials, and integration keywords.
Realistic enterprise scope
Order and inventory sync is a recognizable CRM-to-ERP problem.
Good interview depth
Discuss idempotency, retry queues, governor limits on callouts, and monitoring.
Project overview
Apex ERP integration middleware is credible Salesforce developer resume material because integrations are a daily responsibility on mature orgs.
When Opportunities close won, Apex transforms line items into ERP payloads, posts them through Named Credential-backed REST callouts, and publishes Platform Events when retries are needed after transient HTTP failures.
On a resume, that gives you ways to describe callout limits, async processing, idempotent keys, structured error logs, and test classes with HttpCalloutMock.
Architecture overview
Project flowClosed-won trigger
Opportunity stage change enqueues integration work without blocking the user transaction.
Payload transformation
Apex maps Opportunity products to ERP order lines with validation.
REST callout
Named Credentials secure ERP endpoints; callouts run in async context.
Platform Event retry
Failed callouts publish events consumed by a retry subscriber with backoff.
Integration log object
Custom object stores request, response, and correlation IDs for support.
HttpCalloutMock tests
Tests simulate success, timeout, and error responses.
What this project includes
- Async Apex for ERP REST callouts
- Named Credential configuration
- Platform Event retry pipeline
- Custom integration logging object
- Idempotent order keys
- HttpCalloutMock test coverage
Tech stack
Integration stacks on Salesforce center on secure callouts, async processing, and observable error handling—not generic middleware frameworks.
Apex
Transforms CRM records and executes REST callouts with governor-limit awareness.
Named Credentials
Stores ERP endpoint URLs and auth without hard-coded secrets.
Platform Events
Decouples retry processing from the original transaction.
REST API
Defines the ERP contract for order and inventory sync.
Salesforce DX
Version-controls integration classes and credential metadata.
Custom Objects
Persists integration logs searchable by operations teams.
Features implemented
Async callouts
User transactions stay fast while integration runs in queueable or event context.
Retry with backoff
Transient ERP outages do not lose orders.
Secure credentials
Named Credentials keep secrets out of source code.
Idempotent posts
Duplicate triggers do not create duplicate ERP orders.
Operational logs
Support teams trace failures with correlation IDs.
Mock-based tests
HttpCalloutMock validates success and failure paths.
Resume bullet examples
These bullets present integration as Apex middleware, not Java Spring services.
- Built Apex ERP integration that synced closed-won Opportunities via Named Credential REST callouts with async Queueable execution.
- Published Platform Events for retry processing when ERP endpoints returned transient errors, with exponential backoff in the subscriber.
- Created a custom Integration_Log__c object storing request payloads, HTTP status, and correlation IDs for operations troubleshooting.
- Wrote Apex tests with HttpCalloutMock covering success, timeout, and validation failure scenarios at 90%+ coverage.
Skills demonstrated
This project demonstrates Apex integration, REST callouts, Platform Events, and operational logging.
Integration
Async
Quality
ATS keywords extracted from this project
Use Salesforce integration keywords rather than generic API middleware terms.
Interview questions based on this project
Integration projects invite callout limit and retry questions.
Why async for callouts?
Callouts cannot run in the same transaction as DML that triggered them without async boundaries; Queueable and Platform Events kept user saves fast.
How did you handle duplicates?
Idempotent ERP keys derived from Opportunity Id prevented duplicate order creation on reprocessing.
How did you test callouts?
HttpCalloutMock classes simulated 200, 500, and timeout responses in Apex tests.
How would you improve it?
Add a dead-letter queue UI for ops and MuleSoft-style circuit breaking if volume grows beyond Apex limits.
Common mistakes
Describe Named Credentials, Platform Events, and Apex—not Java middleware.
Show async awareness to prove governor-limit maturity.
Integration logs make failures debuggable.
HttpCalloutMock is expected in credible Apex integration work.
FAQ
Is ERP integration a good Salesforce developer project?
Yes. Integrations are among the most common Salesforce developer responsibilities.
Do I need a real ERP?
A mock REST service or Postman mock server works if callout and retry logic are real.
Should I mention Platform Events?
Yes when they decouple retries—that pattern is interview-friendly.
How many bullets should I use?
Two to four bullets on callouts, retries, logging, and tests.
Turn project details into resume evidence
Use this Apex integration to strengthen your Salesforce developer resume
Present REST callouts, Platform Events, and recruiter-friendly integration patterns with stronger keyword alignment.
Free to start · No credit card required