Senior Full-Stack .NET Web Developer (Contract)

Hillsborough County; United States; Remote; USD 138,000 - 165,000; Full time

Job summary

Hillsborough County is seeking a Senior Full-Stack .NET Web Developer to design and deliver scalable web applications. The role combines server-side C#/.NET with modern JavaScript frameworks, emphasizing security, performance, and accessible UI.

As a contractor working remotely, you will own API development, UI translation, and cloud deployments on Azure, mentor peers, and help shape best practices across the team.

Qualifications

• 10+ years of professional software development experience.
• Strong C#/.NET (Core/Framework), including ASP.NET Core MVC/Razor Pages.
• Proficient in modern JavaScript/TypeScript with React, Angular, or Vue.
• Experience with SQL Server and SQL optimization.
• Azure experience: App Service, DevOps, CI/CD pipelines.

Responsibilities

• Design, develop, and maintain web apps using ASP.NET Core and modern JS frameworks.
• Build RESTful/GraphQL APIs and backend services in C#/.NET.
• Translate UI/UX designs into semantic HTML/CSS/JS.
• Architect scalable, secure web architectures and reusable UI patterns.
• Ensure WCAG 2.1 AA compliance and performance optimization.
• Collaborate cross-functionally to deliver end-to-end solutions.
• Support Azure hosting and CI/CD deployments.
• Mentor junior developers and lead code reviews.
• Monitor, troubleshoot, optimize production performance.

Skills

C#/.NET

ASP.NET Core

JavaScript/TypeScript

React/Angular/Vue

SQL Server

Azure

Tools

Azure DevOps

REST/GraphQL APIs

Job description

Senior Full-Stack .NET Web Developer

Location: Remote
Employment Type: Contract
Experience Level: Senior (10+ years)
Salary: $100-$120/hr.

About the Role

We are seeking a highly skilled Senior Full Stack .NET Web Developer with deep expertise across the full web stack — from server-side C#/.NET services to modern JavaScript front ends — to join our technology team. The ideal candidate will bring at least a decade of professional software development experience, with a strong track record of designing, building, and maintaining polished, secure, and high-performing web applications. This role requires a blend of technical excellence, UI/UX sensibility, problem-solving, and leadership to architect, build, and optimize mission-critical, public-facing web systems.

Key Responsibilities

• Design, develop, and maintain responsive, accessible web applications using ASP.NET Core (MVC/Razor Pages) and modern JavaScript/TypeScript frameworks such as React, Angular, or Vue.
• Build and maintain RESTful/GraphQL APIs and backend services in C#/.NET that power front-end applications and integrate with SQL Server and other enterprise systems.
• Translate UI/UX designs and wireframes into clean, semantic, cross-browser HTML5, CSS3, and JavaScript/TypeScript.
• Architect scalable, secure, and performant front-end and back-end web architectures, including component libraries, state management, and reusable UI patterns.
• Ensure web applications meet accessibility (WCAG 2.1 AA) and web security best practices, and are optimized for performance across browsers and devices.
• Collaborate with cross-functional teams, including product, UX/design, QA, and business stakeholders, to deliver end-to-end web solutions.
• Support cloud-based hosting and deployment initiatives using Azure (App Service, Azure DevOps, CI/CD pipelines).
• Mentor junior developers and contribute to front-end and back-end technical best practices, code reviews, and architectural discussions.
• Build and optimize CI/CD pipelines to ensure rapid, reliable, and automated web application deployments.
• Monitor, troubleshoot, and optimize web application performance, scalability, and reliability in production.

Required Qualifications

• 10+ years of professional software development experience, with a strong emphasis on web application development.
• Proven expertise in C#/.NET (Core/Framework), including ASP.NET Core MVC/Razor Pages and building RESTful APIs.
• Strong proficiency in modern JavaScript/TypeScript and hands-on experience with at least one major front-end framework (React, Angular, or Vue).
• Solid command of HTML5, CSS3, and responsive, cross-browser design principles.
• Proven experience with SQL Server (or comparable relational databases) and strong SQL query and optimization skills.
• Experience implementing web accessibility standards (WCAG 2.1 AA / Section 508).
• Experience with Azure, including App Service, DevOps/CI-CD pipelines, and cloud deployment for web applications.
• Strong understanding of web application security best practices (authentication/authorization, OWASP Top 10, data protection).
• Excellent problem-solving, troubleshooting, debugging, communication, and leadership abilities across front-end, back-end, and database code.

Preferred Qualifications

• Experience with public sector or government web applications.
• Demonstrated ability to leverage generative AI and AI-assisted development tools to improve code quality, code review, refactoring, unit-test creation, troubleshooting/debugging, and technical documentation while validating generated output for accuracy and security.
• Experience with SharePoint, Power Automate, or other Microsoft 365 integration technologies.
• Relevant technical certifications in web development, .NET, Azure, or JavaScript frameworks.
• Prior experience leading small development teams or mentoring peers.

Why Contract with Us?

• Contract is with local government entity
• Serve in a high-impact senior technical role supporting mission-critical public services across traditional Microsoft enterprise technologies and modern Azure-native services.
• Support a strategic Azure-hosted messaging platform while strengthening automation, reliability, and troubleshooting capabilities through an independent contractor engagement with competitive hourly compensation.