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Custom Application Development

Workday Extend Partners

Workday Extend is Workday's platform-as-a-service layer for building custom applications that run natively inside Workday, reusing its security model, data, and user experience — used when a genuinely unique business process can't be covered by an off-the-shelf ISV product or standard configuration. Before commissioning custom Extend development, check the ISV marketplace first: a certified product is usually faster to deploy and lower-risk, since it's already tested against Workday's twice-yearly release cadence. Use the filters below to find Extend development specialists by region, industry, and company size.

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Free PDF · Updated 2026
The Workday Partner Selection Guide

How to shortlist, scope, and negotiate with Workday system integrators — ~30 pages, independent, vendor-neutral.

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Frequently Asked Questions

What is Workday Extend?

Workday Extend is Workday's platform-as-a-service layer for building custom applications that run natively inside Workday, reusing its security model, data, and user experience. It's used when an off-the-shelf ISV product or standard configuration can't cover a genuinely unique business process.

When should I use Workday Extend instead of an ISV product?

Check the ISV marketplace first — a certified product is usually faster to deploy and lower-risk since it's already tested against Workday's release cadence. Reserve custom Workday Extend development for requirements that are genuinely unique to your organisation and not addressed by any existing product.

Who maintains a custom Workday Extend application after it's built?

This should be scoped explicitly with your development partner — some offer ongoing maintenance and release-compatibility testing as a retainer, while others hand off the codebase for your internal team or an AMS partner to maintain.

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