Vova Ivanov, a Pulumi summer intern, details his experience modernizing a web application using Pulumi by transitioning an existing TypeScript voting app example into Python with Flask for the frontend and Redis for the backend. He outlines the step-by-step process of cloning the repository, setting up a new Pulumi project, and configuring AWS infrastructure, including the creation of an Elastic Container Service (ECS) cluster, Virtual Private Cloud (VPC), security groups, IAM roles, and an Elastic Container Registry (ECR) for Docker images. The blog post demonstrates setting up both the Redis backend and Flask frontend, using AWS services such as ECS, EC2, and ECR to manage containerized applications and their networking. Ivanov emphasizes the ease of standardizing on a single programming language for frontend, backend, and infrastructure using Pulumi, and previews future posts on further modernizing the app by migrating from Flask to Django and Redis to Amazon RDS. The complete code for this project is available on GitHub, providing a comprehensive guide for developers looking to implement similar infrastructure changes.