Application Submission API Integration

Context

Thousands of employees move through our benefits platform: entering their information, shopping the marketplace, and submitting applications for medical coverage. The volume is predictable, the work is repetitive, and the cost of errors is high — which makes it exactly the kind of problem worth solving with code.

The Problem

Before this integration, every submitted application landed in a queue for our Enrollment Services team. A data entry specialist would open the application, identify the carrier, log into that carrier’s portal, and manually re-key the employee’s information to complete the submission.

This created several issues:

• Human error. Manual re-entry meant typos, missed fields, and rejected applications.
• Doesn’t scale. Every new client or open enrollment season meant either hiring more data entry staff or watching the queue grow.
• Slow turnaround. Employees waited days for their coverage to be officially submitted, depending on the team’s backlog.

The Build

A few decisions worth highlighting:

Carrier adapter pattern. Rather than a giant if/else block for each carrier, I built a common submission interface with carrier-specific adapters underneath. Each adapter handled that carrier’s auth, payload format, and quirks. Adding the next carrier became a matter of writing one adapter, not refactoring the whole pipeline.

Field mapping per carrier. Every carrier wanted the same data shaped differently — date formats, dependent structures, required vs. optional fields, even how they encoded plan IDs. I built a mapping layer so our internal application data could be transformed into whatever shape each carrier expected.

Validation before submission. Carriers reject applications for inconsistent reasons (missing SSN format, dependent age cutoffs, address validation, etc.). I added pre-submission validation that caught these issues before hitting the carrier’s API, so we could surface problems immediately instead of waiting for a rejection days later.

Error handling and retries. Carrier APIs go down, time out, or return cryptic errors. I built retry logic for transient failures and a clear escalation path for true rejections, so the Enrollment Services team only got involved when human judgment was actually needed.

The Outcome

• ~60% of applications fully automated through the top carrier integration alone, and growing as we added the next two.
• Faster employee coverage confirmation — submissions that used to wait in a queue now go out in seconds.
• Reduced data entry workload, freeing the Enrollment Services team to focus on the carriers that still required manual handling and on edge cases that genuinely needed a human.
• Fewer rejected applications thanks to upfront validation catching issues at submission time.