Job Description

Integration risk is invisible until go-live. The Senior Interface Designer is the person who makes it visible — knowing which interfaces are on the critical path, which third-party system teams are behind, and which mapping decisions will create a production defect six months after go-live. That awareness comes from owning the workstream, not contributing to it.

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 specialize in SAP SuccessFactors, Oracle HCM, and Workday across the full delivery spectrum: HR process design and consulting (ALIGN), technology implementation (AUTOMATE), change management and adoption (ADOPT), and managed support services (AMS).

RAC is seeking a Senior Functional Interface Designer to lead the integration design workstream on Oracle HCM implementations. You will own the end-to-end interface catalogue — from requirements elicitation and IDD production through developer handoff, testing, and UAT sign-off — acting as the functional integration authority for the delivery team and the primary interface contact for the client's IT architecture team.

WHAT YOU WILL DO

• Own the integration catalogue from day one — producing the full interface inventory within the first two weeks of design phase, classifying each interface by pattern, direction, criticality, and third-party owner, and maintaining it as the single source of truth throughout the project
• Lead integration requirements workshops — extracting trigger conditions, error handling expectations, SLA requirements, and business consequence of failure, and producing workshop outputs that flow directly into IDD authoring
• Produce and own all Interface Design Documents — at a level of precision that an OIC developer can build from without functional re-engagement, with a client IT sign-off process before development begins
• Drive interface prioritisation and phasing — recommending development sequence based on go-live criticality, third-party readiness, and data migration dependencies, and escalating when a third-party team is blocking sign-off
• Review and approve OIC developer builds against IDD specifications — logging formal defects with reference to specific IDD fields and distinguishing design deviations from legitimate technical implementation decisions
• Own integration UAT — designing the test plan, coordinating third-party test environment availability, and driving defect resolution to formal sign-off

WHY ROLLING ARRAYS

RAC's Oracle HCM programmes are multi-country, multi-integration engagements where integration risk is one of the top three programme risks on every project. As the functional integration lead, you own that risk — and you have the visibility, authority, and pathway to Solution Architect that comes with it.

OUR CULTURE CODE

Six values define how we operate every day at Rolling Arrays:

• Thinking Smart — spot patterns, chase smarter solutions, and illuminate the path to greater productivity
• Never Stop Learning — refine and elevate skills constantly; explore the world with a curiosity lens
• Being Nice to Everyone — treat everyone with genuine warmth and respect, regardless of seniority
• Be Super Patient with Customers — exercise patience and proactivity in every client interaction
• Help Your Teammates — share the load, lighten the stress, nurture a truly collaborative team
• Acknowledge Your Mistakes — embrace mistakes as steppingstones; grow from each one

Requirements

WHAT WE'RE LOOKING FOR

• 4–5 years of Oracle HCM experience with proven interface design workstream ownership on at least two implementations through to UAT sign-off
• Experience owning and managing an interface catalogue of 10+ integrations on a single engagement
• Demonstrated developer QA experience — has reviewed built integrations against specifications, raised formal defects, and managed rework to sign-off
• Ability to manage third-party system teams and escalate through the project governance structure when external dependencies are blocking progress
• Ability to present integration workstream status, risk, and readiness to client IT Directors and project leadership

PREFERRED QUALIFICATIONS

• Oracle Cloud Platform Application Integration 2025 Professional — the OIC certification; at Senior Interface Designer level this is an expected credential, not aspirational
• Oracle Global Human Resources Cloud Implementation Professional — Senior interface leads who hold the Core HR module certification can independently validate data availability against the Oracle HCM object model without escalating to the functional team
• Oracle Fusion Cloud Applications HCM Process Essentials certified — the foundational HCM credential confirming cross-module process understanding
• Experience designing interfaces between Oracle HCM and Oracle ERP, or between Oracle HCM and third-party payroll, HRIS, or access management systems in APAC

BUSINESS & CONSULTING SKILLS

• IT architecture credibility — presents integration design decisions to client IT architects and holds the conversation at a technical authority level
• Third-party system management — manages external system teams who are not under RAC's control and escalates effectively when they are blocking the programme
• Integration risk communication — translates interface catalogue status, risk, and readiness into a format that project leadership can make decisions from
• IDD governance — implements a sign-off process that prevents downstream defects without creating bureaucratic delays
• Workstream leadership — owns the integration track end-to-end without requiring functional or technical hand-holding
• Developer quality review — reviews OIC builds against specifications, raises formal defects, and manages rework to resolution

CAREER PROGRESSION

Senior Consultant → Lead Consultant → Solution Architect → Practice Lead