Senior .NET Developer/ React Developer

Compunnel, Inc.; Austin (TX); On-site; USD 100,000 - 140,000; Full time

Job summary

A leading software solutions provider is seeking a skilled Sr. .NET / React Developer in Austin, Texas, to build and enhance back-end services while supporting front-end development tasks. This position is key to modernizing critical enterprise applications for cloud readiness and long-term maintainability. The ideal candidate will have extensive experience with the Microsoft .NET technology stack and Azure services, possessing a strong commitment to software craftsmanship and agile methodologies. Competitive package offered.

Qualifications

• 10+ years of experience with the Microsoft .NET technology stack.
• Strong experience with Azure services and cloud-native tooling.
• Deep understanding of domain-driven design and modular architecture.
• Expertise in RESTful API development and service-oriented architectures.
• Proficiency in SQL query optimization and data modeling.

Responsibilities

• Develop and enhance back-end services using .NET Framework and .NET Core.
• Design, build, and consume RESTful APIs for integrations.
• Implement integrations with third-party APIs and legacy systems.
• Write optimized SQL queries for database architecture.
• Participate in agile ceremonies and contribute to CI/CD pipelines.

Skills

.NET Framework and .NET Core

Azure services

RESTful API development

SQL optimization

Agile methodologies

Tools

Azure DevOps

Git

XUnit

NUnit

Job description

The Sr. .NET / React Developer is responsible for delivering high-quality software solutions with an emphasis on back-end development (70%) and strong front-end support (30%).

The developer will contribute to the modernization of a critical enterprise application, ensuring scalable architecture, cloud readiness, and long-term maintainability.

Key Responsibilities

• Develop and enhance back-end services using .NET Framework and .NET Core.
• Design, build, and consume RESTful APIs and service-oriented integrations.
• Implement integrations with third-party APIs, legacy systems, and data synchronization workflows.
• Write optimized SQL queries and contribute to database architecture in Microsoft SQL Server environments.
• Participate in agile ceremonies including sprint planning and retrospectives.
• Implement and support unit testing using XUnit, NUnit, Moq, or similar frameworks.
• Contribute to CI/CD pipelines and DevOps practices using Azure DevOps or GitHub Actions.
• Apply Git best practices, including advanced branching strategies.
• Adapt to evolving requirements and collaborate within a smaller cross-functional team.
• Provide constructive feedback through code reviews and support continuous improvement.
• Contribute to the modernization of a legacy enterprise system into Microsoft Azure.

Required Qualifications

• 10+ years of experience within the Microsoft .NET technology stack (.NET Framework and .NET Core).
• Strong experience with Azure services such as Azure Functions, App Services, Logic Apps, Azure DevOps, and cloud-native tooling.
• Deep understanding of domain-driven design (DDD) and modular architecture.
• Experience participating in major enterprise application projects, preferably in regulated environments.
• Expertise in RESTful API development and service-oriented architectures.
• Experience with integration patterns, third-party APIs, and legacy system modernization.
• Advanced SQL skills, including query optimization and data modeling.
• Familiarity with unit testing frameworks and a test-driven development (TDD) approach.
• Experience working in agile or hybrid development environments.
• DevOps and CI/CD experience preferred.
• Strong version control skills with Git and branching strategies like GitFlow.
• Ability to collaborate in small team environments, adapt to changing priorities, and deliver high-quality results.
• Strong commitment to continuous learning and professional growth.
• Passion for high-quality software craftsmanship.

Preferred Qualifications

• Experience building high-performing teams.
• Experience with infrastructure-as-code and security-as-code practices.