Senior Software Developer – WPF / MVVM / .NET Legacy Modernization (Hybrid) (Bangalore)

QAAgility Technologies; Bengaluru; Hybrid; INR 4,000,000 - 6,000,000; Full time

Job summary

QAAgility Technologies is seeking Senior Software Developers to modernize a legacy WPF desktop application using MVVM, DI/IoC, and testable design patterns.

You will refactor tightly coupled components, maintain business behavior, and enable incremental migration while delivering new features. Strong unit testing and static analysis experience is essential, with collaboration across architecture governance.

Qualifications

• 8+ years of professional software development experience.
• Strong hands-on experience with C#, WPF, XAML, and MVVM.
• Experience modernizing legacy WPF applications with MVVM and DI/IoC.
• Proven unit testing with xUnit/NUnit and Moq; static analysis via SonarQube.

Responsibilities

• Modernize legacy WPF applications, screens, and modules with clean MVVM architecture.
• Separate Views, ViewModels, business logic and infrastructure concerns.
• Design service-layer abstractions to improve modularity and testability.
• Apply DI/IoC using .NET containers including Microsoft.Extensions.DependencyInjection.
• Refactor legacy code while preserving business behavior.
• Enable coexistence between legacy and modernized components during migration.
• Develop and maintain automated unit tests with xUnit or NUnit.
• Use Moq or equivalent to isolate dependencies.
• Participate in code reviews, design discussions, and planning.
• Follow UML, architecture docs, coding standards, and governance.
• Leverage SonarQube and code metrics to address technical debt.

Skills

C#

WPF

XAML

MVVM

Prism

DI/IoC

Moq

xUnit

NUnit

SonarQube

Static Analysis

Visual Studio Metrics

UML

Architecture Documentation

Unit Testing

Tools

Prism

Moq

SonarQube

Visual Studio Analysis

Job description

Job Title - Senior Software Developer - WPF / MVVM / .NET Legacy Modernization (Hybrid / Bangalore)

Job Type - Hybrid

Experience - 8+ Years

Position Overview

We are looking for Senior Software Developers with strong hands‑on experience in C#, .NET, WPF, XAML, and MVVM to support the modernization of a business‑critical legacy desktop application.

The selected developers will progressively refactor tightly coupled legacy components into a modular, maintainable, testable architecture, while ensuring existing business functionality remains stable and new feature development can continue in parallel.

The ideal candidate will have proven experience modernizing legacy WPF applications, applying MVVM and dependency injection, introducing service‑layer abstractions, and improving code quality through automated testing and static‑analysis tools.

Key Responsibilities

• Modernize legacy WPF applications, screens, and modules using clean MVVM architecture.
• Separate Views, ViewModels, business logic, and infrastructure concerns.
• Design and implement service‑layer abstractions to improve modularity and testability.
• Apply Dependency Injection (DI) and Inversion of Control (IoC) using appropriate .NET containers, including Microsoft.Extensions.DependencyInjection.
• Refactor tightly coupled legacy code while preserving existing business behavior.
• Enable coexistence between legacy and modernized components during incremental migration.
• Develop and maintain automated unit tests using xUnit or NUnit.
• Use Moq or equivalent mocking frameworks to isolate dependencies and improve testability.
• Participate in code reviews, technical design discussions, and delivery planning.
• Follow established architecture, UML diagrams, coding standards, folder structures, and governance guidelines.
• Use SonarQube, Visual Studio Code Metrics, and static‑analysis tools to identify technical debt and improve maintainability.
• Deliver production‑quality code with minimal supervision.

Required Technical Skills

• 8+ years of professional software development experience.
• Strong hands‑on experience with:
• C#
• WPF
• XAML
• MVVM
• Strong understanding of WPF concepts including:
• Data binding
• Commands
• Resources
• Styles/templates
• UI lifecycle
• Experience with MVVM frameworks such as:
• Prism
• or equivalent frameworks
• Strong knowledge of:
• Inversion of Control
• Service abstractions
• Proven experience refactoring and modernizing complex legacy applications.
• Strong unit‑testing experience with xUnit/NUnit and Moq or equivalent.
• Hands‑on experience with SonarQube or equivalent static‑analysis and quality‑management tools.
• Experience using Visual Studio code analysis/metrics and addressing technical debt.
• Ability to understand and implement UML, architectural documentation, coding standards, and established development conventions.
• Strong troubleshooting, analytical, and communication skills.
• Ability to work independently and contribute with minimal technical ramp‑up.

Preferred Experience

• Experience modernizing large‑scale or business‑critical WPF applications.
• Experience performing incremental migration from legacy architecture to MVVM.
• Experience supporting modernization while simultaneously delivering new business features.
• Experience improving maintainability, cyclomatic complexity, coupling, and technical debt.
• Experience working in environments with formal architecture governance and quality gates.