Joshua Preston

Led modernization of an earned wage access platform by refactoring a monolith into ASP.NET Core microservices for ingestion, wage calculation, ledger, and reporting. Built REST APIs with OpenAPI/Swagger and replaced legacy WCF/SOAP integrations to streamline onboarding for payroll providers. Implemented event-driven workflows with Azure messaging and developed Angular dashboards. Managed Azure infrastructure on AKS and related services, set up CI/CD with automated testing and static analysis, and applied OAuth/OpenID-based API security and RBAC.

Modernized manufacturing and lubricant distribution systems by migrating legacy VB.NET components to ASP.NET Core services. Built backend integrations using REST and GraphQL, and developed operational web interfaces with React, TypeScript, Redux, and Razor Pages while introducing Blazor Server for internal tools. Improved SQL Server performance for scheduling and reconciliation workloads, implemented Redis caching, and built asynchronous processing pipelines with RabbitMQ and .NET background services. Delivered AWS-based backend services using EC2, Lambda, S3, IAM, CloudWatch, and Application Load Balancer, and used Docker, TeamCity CI/CD, and Postman-based testing.

Contributed to insurance web applications built with C# and the .NET Framework, supporting underwriting and placement workflows used by operations teams. Migrated legacy WebForms functionality to ASP.NET MVC with a component-based UI approach. Implemented and extended WCF SOAP services for cross-platform communication and supported data processing with ADO.NET and SQL Server using LINQ-to-SQL. Worked on performance improvements including Oracle PL/SQL stored procedures and C++-based indexing for a high-frequency lookup use case.