We are recruiting a Laboratory Billing Assistant for one of our clients. This is a Clinical Analysis Laboratory focused on home-based sample collection services. We are seeking a professional to join the team. Our partner is a well-established company in this industry. * **Your responsibilities:** Verify medical orders for billing across various health insurance providers: Unimed, Amil, Cassi, and others. Issue invoices. Manage accounts receivable. Assist the customer service department as needed. Organize documents and contracts. Serve patients by registering exams in the SIL system. Update health insurance provider tables and data in the system. Identify opportunities to optimize billing processes and suggest improvements to increase efficiency and reduce errors. Requirements: * Preferred: Office Assistant course or related fields; students majoring in Administration, Accounting, etc. * Intermediate proficiency in Microsoft Office suite * Prior experience working in a laboratory handling laboratory test codes — minimum 6 months in this role * Familiarity with health plan procedures (e.g., Unimed, Amil, Cassi, and others) is preferred * Intermediate Excel skills * Completed high school education CLT employment contract + Benefits * Working hours: Monday to Friday, 8:00 AM to 5:00 PM * Salary negotiable * Meal/food allowance: BRL 300.00 (on-site cafeteria available) * Transportation allowance (VT) * Life insurance Minimum Education Level: High School (Secondary Education)