A functional Interface Designer produces the specification that determines whether an integration works the first time or goes through five defect cycles. If your Interface Design Documents are precise enough that a developer can build from them without a single clarifying question, and your integration test cases catch edge cases before UAT, this is your workstream.

ABOUT ROLLING ARRAYS

Rolling Arrays is a private equity-backed, award-winning HR Tech consulting firm — Asia Pacific's premium partner for enterprise HR digital transformation. Headquartered in Singapore and with offices across India, Malaysia, Australia, and Hong Kong, we have delivered more than 200 HR Transformation projects since our founding in 2009, and were recognised as one of Singapore's Top 100 fastest-growing companies in 2025. We specialise in SAP SuccessFactors, Oracle HCM, and Workday across the full delivery spectrum: HR process design and consul...