The client is a national science advocacy nonprofit committed to advancing scientific knowledge. Its on-premises SharePoint 2010 farm was nearing the end of its support lifecycle and held over 25 customizations with compiled source code. i3solutions evaluated that legacy farm, built a phased migration plan and an optimized site structure around the organization’s business requirements, and moved the environment to the cloud-based Office 365 platform, scheduling the content transfer over four weekends so the impact on key processes stayed minimal. Every customization was assessed for relevance and functionality and then replaced, retired, or reengineered, with the surviving ones rebuilt in lightweight front-end client scripting: JavaScript, jQuery, and AngularJS. ShareGate and SharePoint’s internal migration tool moved the content itself. That SharePoint development work carried into a second phase of reengineering selected applications for Office 365, documented in process maps, wireframe diagrams, and application documentation produced with over 10 different departments, alongside SharePoint workflow automation and JavaScript forms that automate and track the organization’s internal processes. After go-live i3solutions stayed on as second-tier escalation for the organization’s IT portal team, handing the support volume back as the team took it over.