1) APIs: Developed RESTful APIs for web/mobile apps using Django Rest Framework, improving response times by 30%.2) Optimization: Utilized caching mechanisms to optimize code performance, reducing load times by 25%.3) AWS Management: Managed AWS services to monitor and verify the successful upload of files to S3, ensuring 99.9% data integrity and accessibility.4) Database: Integrated PostgreSQL databases to manage and store application data efficiently, enhancing data retrieval performance.5) Logger: Logger added to track the weather data and handle concurrent request and rollback while transactions.6) Transactions: Handled concurrent requests and rollback while transactions. I implemented mechanisms like locking or optimistic locking to prevent conflicts and ensure data consistency. Additionally, I utilized atomic transactions, which guarantee that either all changes within a transaction are successful, or none are applied, maintaining data integrity.7) API Handled: Leveraged experience to connect applications with Karza and Fidypay for data verification and payments.8) Middlewares: Implemented a custom middleware to track user activity and automatically log out users if inactive for 5 minutes.8) AWS EC2 Manage: Managed the deployment and scaling of applications on AWS EC2 instances to ensure high availability.