•Provides advice, financial interpretations, adaptations and corrective actions in response to audits and other queries to ensure adherence to the UN Financial Regulations and Rules, Staff Rules, Administrative Instructions, Bulletins and Circulars under the guidance of the Service Delivery Manager. •Acts as a Certifying Officer under Financial Rule 105.5 or Approving Officer under Financial Rule 105.4 in adherence with the UN Regulations and Rules. •Reviews and verifies completeness of documentation supporting invoices and payment requests. •Approves and creates profiles in payroll systems. •Management of delivery of services such as processing of non-travel related commercial vendors' invoices and payments to vendors providing goods or services to all RSCE Client Missions (processing invoices resulting from commitments such as Purchase Orders, Fund Commitments, Direct Expenditures, Medical clinic invoices and Replenishment of imprest/petty cash. •Development of the Service Line's annual budget development programme, particularly with respect to the establishment of major resourcing priorities, prepare cost estimates and budget proposals, in terns of the Service Line's resourcing requirements such as non-staff requirements, including programmatic aspects; review, analyze and revise data with respect to the finalization of the budget proposals as well as Result Based Budgeting inputs. •Participates in the preparation, review and finalization of budget performance reports in compliance with the Legislative requirements and recommendations and Controller's