Jayaganesan Sivalingam

Technologies: ArchiMate, TOGAF, Microservices, SOA, IAM, BPMN, Archi, MEGA, Microsoft Entra ID, ServiceNow (SNOW), Containers, Messaging ⸻ Project: Unification of Invoice Matching for RPCG Migrated RPCG OU from a legacy mainframe-based invoice matching system to a modern 2-way solution already used by other OUs. • Led cross-functional architecture workshops with Business Architects, Solution Analysts, and Technology Leads, aligning stakeholders on a unified solution design and reducing project cost by 50% (€400K) by reusing the existing instance. • Coached a junior architect, reviewing solution designs and integration patterns (Message-Driven, Event-Driven) to ensure compliance with enterprise architecture standards. • Facilitated data migration workshops, defining strategy (extraction, cleansing, transformation, mapping, loading) to ensure smooth and audit-compliant migration. Project: Enabling MFA in Supplier Portal Enabled MFA (SMS/TOTP) for supplier-facing portals. • Analyzed the current WebSphere portal architecture with F5 APM, reviewing applications (Angular, JSF, ERP) and protocols (LTPA2, OIDC, SAML). • Designed and proposed a Microsoft Entra ID (Azure AD) integration solution, adapting authentication flows to deliver seamless Single Sign-On (SSO). Project: Replacement of Simulation Tools with Web Application Replaced multiple Excel-based tools with a single web-based application for supplier negotiations. • Assessed feasibility of using Microsoft Power Apps with MySQL backend, considering scalability, maintainability, and integration. • Collaborated with vendor to implement a cloud-based SaaS solution, securely migrating sensitive on-premises data and enabling real-time data exchange using streaming APIs and MFT. • Performed vendor evaluations across performance, scalability, reliability, and maintainability to ensure enterprise alignment. • Facilitated Quality Attribute Scenario (QAS) workshops with business and IT stakeholders to refine requirements and guide architectural decisions. Project: Transactional Mailing within Purchase Replaced legacy mailing system with Microsoft Outlook mailing services and standardized APIs. • Conducted current-state analysis, creating an application inventory of components using the mailing service. • Created current, transition, and future-state architectures using Visio/PowerPoint for stakeholder communication and roadmap planning. • Designed solution using Graph API and REST API for email archival, collaborating with Communication & Collaboration architects to ensure seamless automation. • Developed a reusable Outlook integration library with built-in logging for auditing, improving maintainability and reducing redundancy. Project: EUR/m² Calculation & Product Ranking for Customer Offer Delivered KPIs and product rankings (by product group, store, retail format) to optimize assortment planning and offers. • Identified performance and data quality issues in existing analytical tools and redesigned KPI calculation process with incremental/on-demand computations. • Drafted solution architecture integrating Python analytics with DWH data and implemented an operational batch service for ranking workflows. • Leveraged SAP HANA for memory-efficient, high-performance KPI and ranking computations, enabling faster analytics for business decision-making.