Ultimate Guide to Next-Gen APIs & Developer Infrastructure

API design has evolved significantly. REST replaced SOAP, GraphQL challenged REST, and event-driven architectures are now mainstream. Understanding where APIs are heading helps HR Tech teams make better decisions about what to build on and what to avoid.

The Evolution of API Design

SOAP (Early 2000s)

XML-based, verbose, strongly typed, and built around operations. Still exists in enterprise systems. Some legacy HRIS platforms (older Workday versions, certain ADP products) expose SOAP APIs alongside or instead of REST.

REST (2000s–Present)

Resource-oriented, HTTP-native, JSON-based. The dominant standard for web APIs. Most modern HRIS and payroll platforms expose REST APIs.

GraphQL (2015–Present)

Query-based API design where clients specify exactly what data they need. Good for reducing over-fetching in complex, nested data structures. Less common in HRIS APIs but growing in HR analytics platforms.

Event-Driven / Webhooks (Present)

Push-based notification when data changes. Increasingly standard for HRIS lifecycle events: new hire, termination, compensation change. Reduces the need for polling.

gRPC / Protocol Buffers (Present, Internal)

Efficient binary serialization for internal microservice communication. Not common in public HRIS APIs but used internally by modern platforms.

What This Means for HR Tech Integration

The practical takeaway for HR Tech teams: REST with webhooks is the standard for HRIS integration today. Build for it, and use a unified API layer like Bindbee to abstract the differences between how each vendor implements REST.

As GraphQL and event-driven patterns grow in HR platforms, Bindbee normalizes those interfaces too, so your product doesn't need to adapt to each vendor's chosen API design.

Book a demo to see how Bindbee handles modern and legacy API patterns across 65+ HR systems.