Python Debugging – Fix Existing Registration Script (No Rewrite)

Please read the entire description carefully before submitting a proposal. Do not apply if you have not fully understood the requirements or if you are not available to start immediately. Project Overview I have an existing Python registration script that was working correctly until recently. After a small change on the target platform, the direct/API mode stopped working. This is not a new development project and it is not a full rewrite. The script already exists, the interface already exists, the workflow already exists, and most of the system is already working. I only need an experienced developer to identify the exact issue and fix the affected part. Important * Do not rewrite the project. * Do not replace the current workflow. * Do not suggest a completely different implementation. * Do not convert it into a browser-only solution. * Do not change the interface. * Do not reduce the speed. * Do not reduce the number of parallel workers. * Do not modify unrelated files or features. The final script must work exactly as it did before, with the same interface, behavior, speed, concurrency, and results. Required Testing Process The script uses an API, but the correct debugging process must begin with a manual test outside the script. You must first perform the same process manually in order to understand the current platform behavior, identify what has changed, and confirm the correct flow. Only after understanding the process manually should you test the existing script and compare both flows to identify exactly where the script is failing. Please do not start making random code changes before completing this comparison. What I Need * Advanced Python debugging experience. * Strong experience with APIs, HTTP requests, responses, headers, cookies, sessions, tokens, and authentication flows. * Strong understanding of concurrency, multithreading, workers, and shared sessions. * Ability to inspect logs and raw response pages. * Ability to compare manual behavior with scripted behavior. * Ability to apply a minimal and targeted fix. * Experience debugging systems that use strict security and anti-automation mechanisms. Scope The issue appears to be caused by a small recent change, so this should be treated as a focused debugging task, not as a long-term development project. If you are going to tell me that you need one week, several weeks, or one month to investigate this issue, please do not apply. I do not want to waste your time or mine. I need someone who is available now, can investigate efficiently, and can work toward a confirmed solution without unnecessary delays. Requirements * Keep the existing architecture. * Keep the existing interface. * Keep the current direct/API mode. * Keep the current speed. * Keep the current parallel processing. * Keep the current worker behavior. * Keep the current output and results display. * Change only what is strictly necessary. Before Applying Please do not send a proposal if: * You have not read the full description. * You are not available to start immediately. * You are planning to rewrite the script. * You are planning to replace the direct/API mode with another method. * You cannot perform the process manually before testing the script. * You do not have experience debugging API and session-related failures. * You expect this focused fix to take several weeks. * You are sending a generic or AI-generated proposal without understanding the task. Budget Fixed price: $70 This is not an hourly contract. Deadline The project is already behind schedule, so availability and speed are very important. Please apply only if you can start immediately, follow the required testing process, preserve the current system, and focus on delivering a working fix. In your proposal, briefly explain: 1. How you will test the process manually before testing the script. 2. How you will compare the manual and scripted flows. 3. How you will identify the exact failing step. 4. How you will preserve the current speed, interface, and parallel performance.