Angular 18 + ASP.NET Core Developer Needed to Fix Bugs in Existing Application

I’m looking for an experienced Angular / ASP.NET Core developer to troubleshoot and fix several issues in an existing Out of Office / employee leave management application. The application is already built and functional. I am not looking for a rebuild or redesign. The goal is to identify the root cause of each issue, make clean fixes within the existing architecture, and verify that the changes do not introduce regressions elsewhere. Current Tech Stack Angular 18 TypeScript ASP.NET Core / .NET 8 Entity Framework Core SQL Server REST API Bootstrap Bugs to Fix What I Need I’m looking for someone who can: Work comfortably in an existing Angular + .NET codebase Reproduce each issue before changing the code Determine the actual root cause Fix frontend responsive/layout problems Debug Angular state and API interactions Fix backend validation/business-logic issues Handle duplicate/concurrent actions safely Preserve the existing architecture and functionality Test the affected workflows after making changes Keep changes focused rather than unnecessarily rewriting working parts of the application Deliverables All six reported bugs fixed Backend validation verified for invalid requests Brief summary of the root cause and fix for each bug Clean source code with the completed changes When Applying Please tell me: Your experience with Angular and ASP.NET Core Whether you have worked on existing/legacy applications where you needed to diagnose bugs rather than build features from scratch How you would approach preventing a leave/approval request from being processed twice Your estimated time to investigate and fix these six issues Please start your proposal with “Fix” so I know you read the complete description.