You have been given two main tasks: 1. You are a Python developer who has recently joined as the lead backend engineer at my company, Innovatech Ltd., specializing in developing user interfaces for software applications. The CEO of our organization is impressed by your reputation and invites you to join their project, 'Crafty Commerce'. They're interested in an application that not only allows employees to track the company's sustainability efforts but also enhances decision-making through real-time data analysis for energy usage. Your task is to design a responsive web interface using React and Node.js with TypeScript on top of it, while ensuring compliance with GDPR (General Data Protection Regulation) guidelines. The application should cater to two different user roles: managers who require overview reports with data visualization features such as pie charts or graphs; and employees needing a simplified interface. The system must be responsive across browsers, support multiple languages, include an admin panel for advanced users to monitor energy consumption trends, incorporate dark mode compatibility and feature tooltips that are dynamically displayed based on the user's actions. In addition, it should use WebGL/Sass for styling and have a built-in testing suite with at least 10 different test cases covered in the codebase, which ensures quality assurance. The web application will be integrated with our existing ERP (Enterprise Resource Planning) system to ensure seamless user experience and must integrate advanced data encryption techniques for security. It also needs to facilitate file uploads, database integration, a notification feature notifying users when their consumption is unusually high or low, as well as exporting data into an external reporting tool via Python scripts. Lastly, the interface should allow access level restrictions on the fly and implement A/B testing with automated test suites. Describe how you would approach this task, including all necessary steps and considerations.