.NET Technical Diagnosis & Code Review by Bastian Espinoza.NET Technical Diagnosis & Code Review by Bastian Espinoza
.NET Technical Diagnosis & Code ReviewBastian Espinoza
Cover image for .NET Technical Diagnosis & Code Review
I review existing .NET applications, REST APIs, SQL Server workflows, backend logic, and internal business systems to identify technical issues, risks, and improvement opportunities.
This service is ideal if your application has bugs, performance problems, unclear architecture, API errors, database issues, authentication problems, messy code, or if you need a professional technical review before starting a development phase.
What I can help with:
Review .NET / ASP.NET Core / ASP.NET MVC applications
Analyze C# backend logic and maintainability
Review REST API structure, validation, errors, and responses
Identify SQL Server query or data workflow issues
Review authentication, JWT, roles, permissions, or access logic
Detect technical risks, bad practices, and fragile areas
Suggest practical fixes, refactoring opportunities, and next steps
Provide a clear written diagnosis with findings and recommendations
Best fit for clients who need clarity before investing in bug fixing, maintenance, API work, dashboards, database improvements, or a larger development phase.
Not included by default:
Full implementation of all fixes
Large refactoring work
Full system rebuilds
Production changes
Cloud infrastructure audits
Security penetration testing
Unlimited meetings or unrelated feature planning
Before starting, I confirm the system context, access level, main problem, expected outcome, repository or documentation availability, and the type of report you need.
FAQs

Example work
LegalApp — Role-Based Access Control
Starting at$150
Duration4 days
Tags
ASP.NET Core
C#
Microsoft SQL Server
.NET
Fullstack Engineer
Service provided by
Bastian Espinoza Santiago, Chile
.NET Technical Diagnosis & Code ReviewBastian Espinoza
Starting at$150
Duration4 days
Tags
ASP.NET Core
C#
Microsoft SQL Server
.NET
Fullstack Engineer
Cover image for .NET Technical Diagnosis & Code Review
I review existing .NET applications, REST APIs, SQL Server workflows, backend logic, and internal business systems to identify technical issues, risks, and improvement opportunities.
This service is ideal if your application has bugs, performance problems, unclear architecture, API errors, database issues, authentication problems, messy code, or if you need a professional technical review before starting a development phase.
What I can help with:
Review .NET / ASP.NET Core / ASP.NET MVC applications
Analyze C# backend logic and maintainability
Review REST API structure, validation, errors, and responses
Identify SQL Server query or data workflow issues
Review authentication, JWT, roles, permissions, or access logic
Detect technical risks, bad practices, and fragile areas
Suggest practical fixes, refactoring opportunities, and next steps
Provide a clear written diagnosis with findings and recommendations
Best fit for clients who need clarity before investing in bug fixing, maintenance, API work, dashboards, database improvements, or a larger development phase.
Not included by default:
Full implementation of all fixes
Large refactoring work
Full system rebuilds
Production changes
Cloud infrastructure audits
Security penetration testing
Unlimited meetings or unrelated feature planning
Before starting, I confirm the system context, access level, main problem, expected outcome, repository or documentation availability, and the type of report you need.
FAQs

Example work
LegalApp — Role-Based Access Control
$150