Rainer Ledesma

Lead .NET Engineer at Microsoft

Developed scalable and responsive web applications using .NET Core 6, ASP.NET MVC, Angular 13, Kendo UI, Razor, and TypeScript, ensuring optimal performance and cross-platform compatibility. Engineered interactive user interfaces using React, Angular, and Blazor, increasing user engagement and session durations. Designed and implemented efficient data access layers and NoSQL databases with Entity Framework and Azure Cosmos DB. Configured Blazor applications on Azure services, enhancing scalability and reducing server costs. Enhanced security by implementing OAuth, SAML, and OIDC protocols in Azure Active Directory for over 100,000 user accounts. Automated Azure resource provisioning with Terraform to reduce time and support hundreds of instances. Managed Azure Kubernetes Service, Virtual Machines, and Load Balancers achieving 99.9% uptime. Collaborated in Agile teams improving release cycles and sprint completion rates. Conducted performance tuning using Azure Monitor and Application I

Senior Full Stack Engineer at SmileDirectClub

Innovated and maintained high-performance data analytics and reporting functionalities using .NET Core, ASP.NET MVC, and Angular, improving operational efficiency by 50%. Implemented RabbitMQ messaging queues to improve processing speed for over 100,000 messages daily. Managed Dependency Injection to improve code maintainability. Optimized database interactions using Entity Framework Core and LINQ with SQL Server 2019, reducing query execution times by 40%. Developed complex T-SQL scripts and stored procedures for MS SQL Server enhancements. Established robust unit and integration testing frameworks, reducing critical bugs by 50% and maintaining high-quality standards.

.NET Backend Developer at ADP

Led backend development of a critical payroll processing module using .NET Core and ASP.NET MVC, ensuring scalability for enterprise clients. Designed RESTful APIs to integrate HR management systems with third-party apps, improving client satisfaction. Optimized SQL Server databases to improve query performance by 30%. Deployed OAuth 2.0 for secured authentication in cloud HR solutions. Transitioned to microservices architecture with Docker and Kubernetes, increasing deployment efficiency and scalability. Automated CI/CD pipelines with Azure DevOps and Git, reducing deployment cycles by 50%. Spearheaded Agile adoption, increasing team productivity by 20%.

.NET Backend Developer at Soltech

Collaborated on migrating legacy VB.NET applications to modern technologies and best practices. Upgraded ASP.NET Web Forms project to ASP.NET Core MVC, reducing page load times by 67%. Engineered RESTful architecture that reduced communication overhead and boosted development efficiency. Integrated third-party services including payment gateways to accelerate development cycles. Developed and maintained SOAP/REST web services for complex business operations. Established centralized NuGet repository for internal package distribution. Demonstrated proficiency in SDLC with version control and agile methods to ensure efficient project delivery.

Senior .NET Engineer at Redmond Lead

Developed scalable and responsive web applications using .NET Core 6, ASP.NET MVC, Angular 13, Kendo UI, Razor, and TypeScript, ensuring optimal performance and cross-platform compatibility. Engineered interactive user interfaces using React, Angular, and Blazor; boosted user engagement by 40% through intuitive navigation and responsive design, resulting in a 25% increase in session durations. Leveraged Entity Framework and Azure Cosmos DB to design and implement efficient data access layers and NoSQL databases, increasing data retrieval speed by 30% and supporting over 1 million records. Configured Blazor applications with Azure App Service and Functions, resulting in a 25% reduction in server costs and enhancing scalability for over 50,000 users. Enhanced security by implementing OAuth 2.0 authentication and authorization protocols in Azure Active Directory, ensuring secure authentication for 100,000+ user accounts. Implemented infrastructure as code (IaC) using Terraform to automate

Senior Full Stack Engineer at Smile Direct Club

Led development of scalable web applications using .NET Core, ASP.NET MVC, Angular, and Azure, focusing on performance and cross-platform compatibility. Built interactive UI with React/Angular/Blazor; improved user engagement and session duration. Used Entity Framework + Azure Cosmos DB to optimize data access for >1M records; deployed Blazor apps with Azure App Service and Functions, reducing server costs by 25% and supporting 50k+ users. Implemented OAuth2 in Azure AD for secure authentication of 100k+ accounts. Implemented IaC with Terraform to provision Azure resources, cutting provisioning time by 40% and supporting 200+ instances. Managed AKS, VMs, and Load Balancers with 99.9% uptime and 500k daily requests. Collaborated with PM/UX/UI using Agile and Azure DevOps; improved release cycles by 30% and sprint completion rate to 95%. Tuned performance with Azure Monitor and Application Insights; improved responsiveness by 35% for 75k+ active users.

Backend Developer at ADP

Designed RESTful APIs in C# to enable seamless integration of ADP's HR management systems with third-party applications, enhancing data interoperability and client satisfaction. Optimized SQL Server databases and T-SQL queries, improving query performance by 30% and speeding payroll and benefits processing tasks.

Backend Developer at Soltech

Led backend development of payroll processing modules using C#, ASP.NET, VB.NET, SOAP, and RESTful services; designed APIs to integrate payroll with HR systems, improving data interoperability. Optimized SQL Server databases and T-SQL for payroll and benefits tasks, improving performance.