Interim Systems Integration Manager

Role: Interim Systems Integration Manager Type: Contract - Outside IR35 Location: Hybrid (London + UK Travel) The Opportunity An ambitious, acquisitive professional services group is undertaking a major business systems transformation programme across multiple operating companies. We are looking for an experienced Interim Systems Integration Manager to lead the implementation, integration and rollout of a new technology stack, ensuring systems, data and processes are aligned across the group. This is a hands-on transformation role, combining programme leadership, process design, systems integration and stakeholder management. You'll be responsible for creating a scalable operating model that supports future growth and acquisitions. Key Systems - The programme includes the implementation and integration of: Sage Intacct (ERP) HubSpot (CRM) Employment Hero (HRIS) Scoro (Project Management, Resource Planning & Time Recording) Key Responsibilities * Systems Design & Architecture * Map current business processes and data flows across multiple operating companies. * Design the future-state systems architecture and operating model. * Define system ownership and master data structures. * Remove manual processes, duplicate data entry and spreadsheet-driven workarounds. * Ensure data flows seamlessly across all platforms. Systems Integration * Lead the integration of ERP, CRM, HR and project operations systems. * Define integration requirements and oversee delivery with implementation partners. * Ensure alignment of customer, employee, project and financial data across platforms. * Support data migration, testing and user acceptance activities. * Create scalable integration standards for future acquisitions. Programme Delivery * Develop and manage project plans, milestones and delivery roadmaps. * Coordinate internal stakeholders, software vendors and third-party partners. * Manage risks, dependencies and delivery timelines. * Drive accountability across multiple workstreams and business units. * Provide regular progress updates to senior leadership. Business Transformation * Facilitate process mapping and discovery workshops. * Challenge existing ways of working and identify opportunities for improvement. * Standardise processes across multiple businesses. * Support change management, adoption and user engagement. * Build a repeatable implementation playbook for future growth initiatives. Reporting & Data Visibility * Ensure systems support real-time business reporting and operational visibility. * Enable reporting across project profitability, utilisation, WIP, resource planning and financial performance. * Work closely with business leaders to ensure reporting requirements are embedded within the solution design. Skills & Experience Essential * Proven experience delivering complex systems integration or transformation programmes. * Strong background in ERP, CRM, HRIS or professional services systems implementation. * Experience working within multi-site or multi-entity organisations. * Excellent stakeholder management skills, including engagement with senior leadership teams. * Strong process mapping and business analysis capability. * Experience managing software vendors and implementation partners. * Ability to work autonomously and drive outcomes in a fast-paced environment. Desirable * Sage Intacct implementation experience. * HubSpot implementation experience. * Employment Hero knowledge. * Experience with Scoro or similar PSA/project accounting platforms. * Exposure to M&A integration programmes. * Experience within private equity-backed organisations. * Background working within professional services, consulting, engineering or project-based businesses. Contract Details * Initial 4-month contract * Outside IR35 * Hybrid working model * London-based meetings when required * Travel to UK operating businesses as needed * Immediate start preferred