Sergio Sánchez Olivera

• Automated financial reporting process using Power BI, reducing cycle time from several days to under 2 hours, eliminating manual Excel dependency and freeing capacity for higher-value analysis • Managed and maintained 2,000+ master data records, ensuring data integrity across financial and procurement processes in ERP • Conducted variance analysis and profitability reporting using advanced Excel, improving cost visibility and directly supporting a +4% sales improvement through data-driven recommendations

Automated billing, accounts receivable and month-end closing processes in ERP, reducing manual errors and improving financial cycle efficiency. Performed profitability and cost centre (CO) analysis to maximise ROI on key accounts, delivering actionable insights for commercial decision-making. Collaborated with finance teams to automate and streamline billing, accounts receivable, and closing processes through functionalities.

Improved technical incident resolution KPIs by 60% acting as single SAP interface across 2–3 business units, directly contributing to biennial service contract renewal. Designed and presented monthly financial and consumption reports to Senior Management using SAP FI/CO analytics, enhancing cost control and operational traceability.

Participated as a key user in SAP EVO migration project covering FI/CO modules, executing functional testing, migrating hundreds of master data records and coordinating cross-departmental stakeholders through to successful Go-Live. Developed training and transformation documentation enabling smooth team adaptation to new SAP functionalities post-implementation. Supported financial data cleansing and validation during legacy-to-SAP migration, ensuring integrity of migrated records.

Managed national coordination of scoring and provisioning processes for voice and data services, generating KPI reports for management and supporting continuous process improvement. Oversaw the stabilisation period by controlling acceptance sheets, tracking actions, and managing satisfaction survey distribution to support service delivery and process follow-up. Extracted, analysed, and generated KPIs for voice and data services, providing management reporting and supporting incident resolution.

Managed and organized the department’s daily tasks, preparing effort reports and supporting operational tracking within ERP SAP. Delivered 15% procurement savings versus prior year through supplier negotiation and optimisation of purchase orders in SAP MM. Evaluated and selected local and international suppliers, preparing RFTs and managing procurement catalogues integrated with SAP ERP workflows.