Freddy – React, AWS, Typescript

This project centered on migrating a monolithic .NET and Angular system into a modern, distributed architecture. The new design followed Domain-Driven Design principles and incorporated multiple backend APIs, an API Gateway, and a React SPA client. Authentication and authorization were managed through Keycloak with OAuth 2.0, and the entire solution was deployed in a Kubernetes environment to ensure scalability and resilience.

• Worked with the team in the design of the new system.
• Contributed to building the whole system and infrastructure with Minikube and Helm.
• Worked autonomously on creating the first version with 2 APIs, the API Gateway, Keycloak configuration, and the React SPA client.

This role involved building a new single-page application (SPA) to replace an outdated client website. Precise requirements were provided, and the work concentrated on system architecture and feature development, ensuring scalability, maintainability, and alignment with modern web standards.

• Architected an SPA application using Next.js, Node.js, NestJS, Prisma, and MySQL, ensuring a robust, maintainable API structure.
• Designed and deployed cloud infrastructure using AWS services, including Amplify for frontend hosting, Cognito for Authentication and Authorization, Lambda for serverless backend functions, and Bitbucket Pipelines for automated CI/CD workflows.

The enhancement of a client-facing mobile application for event ticket exchanges. The scope included updating the application and integrating a secure payment system using Stripe, ensuring smooth transactions and improved user experience during live events.

• Developed the backend using Node.js, NestJS, Prisma, GraphQL, and MySQL.
• Ensured a scalable, high-performance architecture.
• Integrated secure payment processing.
• Optimized the app for a smooth user experience and performance.

The project involved leading a development team and migrating legacy Purchasing WPF desktop clients into a modular architecture. The solution was designed with .NET backend APIs, OAuth 2.0, and Microsoft Identity Server 4, paired with a React SPA for the user interface. The role also included implementing telemetry with AWS OpenSearch and establishing automated QA testing with Playwright, while also ensuring stability and maintenance of the existing production systems during the transition.

• Designed scalable, robust solutions using SCRUM/KANBAN, providing agile coaching and aligning technical outcomes with business goals.
• Led migration of legacy .NET Framework 4.5 and WPF apps to modern .NET 8 and React-based web applications, improving performance and user experience.
• Oversaw key initiatives including database migration with schema optimization, containerization on ECS, and observability with OpenSearch.
• Built a pricing ML model using TensorFlowJS and gained substantial expertise in .NET 8, dependency injection, LINQ, SQL Server, AWS, React, and MVVM.