A leading company in services is looking for a Controller to manage the billing, sales, and expense control processes, ensuring compliance with internal procedures and proper coordination with contractors and clients. Responsibilities: * Analyze daily sales by comparing units sold vs. units served. * Prepare and submit Payment Statements (EDP) to the client. Invoice EDPs from contractors and manage provision of sales not billed in the current month. * Digitize and optimize manual service management to improve billing efficiency. * Prepare quotations for special services requested by the client. * Maintain communication with contractor companies to validate invoicing and track payments. * Manage and coordinate collections from Payment Statements. * Coordinate with courier services to ensure invoices are sent within the scheduled timeframe. * Monitor expenses through company reports. Track and generate certain contract purchases. * Participate in team meetings, coordinating improvement points on initiatives. Send periodic billing progress reports to controllers. * Maintain a proactive attitude toward process improvement and billing management. * Perform other administrative tasks related to billing and access control. Requirements: * Degree in Administration, Finance, Business Engineering, or related fields. * Proficiency in management tools (advanced Excel) * Strong organizational, data analysis, and effective communication skills * Availability to work a 4x3 shift schedule at site * Bus transportation provided from Calama to site.