Hybrid .NET Developer — Legacy Modernization Lead

Leoni France; Hermosillo; Hybrid; MXN 600,000 - 900,000; Full time

Job summary

LEONI Hermosillo is seeking an experienced DotNet Developer to lead design, modernization, and enhancement of software applications. You will work with C#/.NET, modernize legacy systems, and guide migrations while leveraging AI-powered tools.

The role requires fluent English, a university degree, and at least five years in the .NET ecosystem; you will mentor teams, drive architecture reviews, and collaborate with stakeholders to deliver robust software solutions.

Qualifications

• University degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Fluent English (written and spoken)
• Minimum 5 years of proven experience in: C# and the .NET ecosystem (Framework, Core, .NET 8); Maintaining, migrating, and modernizing legacy .NET applications; Building web applications (Windows Forms, ASP.NET Core, MVC, Xamarin, RESTful APIs); Object-oriented programming (OOP), SOLID principles, and design patterns; Version control systems (Git); Effective use of AI-powered coding assistants and tools.

Responsibilities

• Design, develop, and deploy scalable applications with C#/.NET.
• Modernize and maintain legacy systems, ensuring stability during migration.
• Use AI-driven tools to optimize coding, debugging, and testing.
• Lead architecture sessions and code reviews to enforce best practices.
• Mentor developers, fostering technical excellence and growth.
• Troubleshoot complex defects and performance issues.
• Contribute across the full software development lifecycle.

Skills

C#

.NET

ASP.NET Core

MVC

Xamarin

RESTful APIs

Git

AI tools

Education

University degree in Computer Science or related

Tools

Azure

Job description

LEONI Hermosillo is seeking an experienced DotNet Developer to lead design, modernization, and enhancement of software applications. You will work with C#/.NET, modernize legacy systems, and guide migrations while leveraging AI-powered tools.

The role requires fluent English, a university degree, and at least five years in the .NET ecosystem; you will mentor teams, drive architecture reviews, and collaborate with stakeholders to deliver robust software solutions.