Senior SharePoint Developer and AdministratorLocation: LondonEmployment Type: PermanentI am working with a leading international professional services firm that is seeking a talented Senior SharePoint Developer and Administrator to join its London technology team. This is an excellent opportunity to take ownership of modernising and enhancing enterprise SharePoint environments across both SharePoint Subscription Edition (SE) and SharePoint Online, while playing a key role in the evolution of the firm''s collaboration and intranet platforms.This role offers a blend of hands-on development, enterprise platform administration, and technical leadership, with the scope to influence architecture, governance, and best practice across a global organisation.The Role - What You''ll Be DoingSharePoint Development and ModernisationDesign, develop and maintain custom solutions across SharePoint SE and SharePoint Online.Lead migration from SharePoint 2016 to SE/Online, including rewriting legacy web parts using SPFx.Build custom SPFx web parts, extensions and integrations using TypeScript, JavaScript, React, HTML/CSS, and REST APIs.Develop and maintain SharePoint Online intranet structures including architecture, navigation, branding, and content design.Integrate SharePoint with internal systems and third-party platforms using RESTful APIs and Microsoft Graph.SharePoint Administration and OperationsAdminister both SharePoint SE (on-prem) and SharePoint Online environments.Manage updates, c