Senior .NET Applications Developer

Maricopa County • Phoenix, AZ

1d • Hybrid

About The Position

Technology is ever-changing and constantly growing, and we are seeking someone who wants to grow with us. If you are someone passionate about building scalable, secure, and innovative enterprise applications using modern Microsoft technologies, consider joining our team! We are seeking a highly skilled Senior .NET Applications Developer to design, develop, and maintain robust solutions leveraging the .NET ecosystem, including ASP.NET, C#, RESTful APIs, and related technologies. The ideal candidate will not only have hands-on experience developing complex business applications and integrations but will also bring a strong understanding of software architecture, development best practices, security, and application lifecycle management to ensure solutions are maintainable, performant, and aligned with organizational standards. If you thrive on solving challenging technical problems, mentoring others, and driving digital transformation through modern application development, this is your opportunity to make a measurable impact.

Requirements

• Five years of progressively responsible experience in application development, programming, systems analysis, software implementation, systems integration, or related information technology functions, including the design, development, maintenance, modernization, and support of enterprise applications utilizing Microsoft .NET, C#, Visual Studio, SQL Server, HTML5, CSS, JavaScript/jQuery, Azure DevOps (ADO), RESTful APIs, and Internet Information Services (IIS)
• Bachelor's degree in Computer Science, Information Technology, Software Engineering, or a closely related field
• An equivalent combination of post-secondary education and/or job-related experience may substitute for the required experience on a year-for-year basis

Nice To Haves

• Experience acting as a technical project lead
• Strong customer service and communication skills with the ability to effectively collaborate with both technical and non-technical stakeholders
• Knowledge of Software Development Life Cycle (SDLC) principles and best practices
• Ability to lead technical design efforts and provide guidance on application architecture, scalability, security, and maintainability
• Demonstrated ability to collaborate effectively within a team of experienced developers, fostering a culture of knowledge sharing, continuous learning, mentorship, and mutual respect
• Understanding of ALM practices and CI/CD pipelines within Azure DevOps (ADO)
• Experience documenting and analyzing legacy applications, business processes, and technical architectures to support modernization initiatives
• Familiarity with responsive web design and adhering to WCAG guidelines for web accessibility
• Experience migrating applications from on-premises environments to Azure cloud services and modernizing legacy .NET Framework applications to current .NET versions (.NET 8+)
• Familiarity with AI-assisted development tools such as GitHub Copilot, Claude Code, Cursor, or similar technologies to improve developer productivity and code quality
• Experience implementing and integrating Single Sign-On (SSO) and identity management solutions, including Okta, Microsoft Entra ID (Azure AD), SAML, and OAuth
• Familiarity with DevSecOps principles and application security tools such as Checkmarx or similar platforms
• Experience leading or supporting Agile transformations, including the adoption of Scrum, Kanban, or other iterative development methodologies
• Familiarity with integrating enterprise applications using Enterprise Service Bus (ESB), message queue, event-driven, or API-based integration patterns

Responsibilities

• Provides technical leadership, guidance, and mentorship to lower-level analysts and technical staff; assigns, reviews, and evaluates work products while promoting adherence to development standards and best practices
• Designs, develops, implements, integrates, and maintains enterprise applications, automation solutions, and supporting systems to meet business and operational requirements
• Leads coordination efforts with IT Security, project managers, business analysts, infrastructure teams, vendors, and stakeholders throughout the application development and implementation lifecycle
• Develops, tests, validates, and implements application enhancements, system modifications, and software solutions while troubleshooting and resolving complex technical issues
• Plans and executes application deployments, upgrades, migrations, testing activities, data conversions, and system configurations while ensuring minimal disruption to business operations
• Develops and maintains technical documentation, operating procedures, disaster recovery plans, training materials, and knowledge transfer documentation to support system sustainability and operational continuity
• Evaluates business processes, workflows, and user requirements; recommends and implements automated solutions, system enhancements, and process improvements that improve efficiency and service delivery
• Reviews departmental needs and user requests, prepares technical specifications, and collaborates with stakeholders to design effective technology solutions
• Participates in production support activities, including troubleshooting, issue resolution, root cause analysis, and on-call support for critical enterprise systems and applications

Benefits

• Tuition reimbursement
• Exceptional work-life balance, with hybrid and alternative work schedule options
• Opportunities for growth and development within Maricopa County
• Low-cost, high-value healthcare for you and your qualifying dependents
• Child care benefits, including access to our on-site center, Maricopa County Kids Club, dedicated to serving Maricopa County families
• Paid vacation, sick time, and parental leave
• Extensive wellness program, including an incentive
• Enrollment in the Arizona State Retirement System, a defined retirement benefit requiring a 12% contribution rate per paycheck that includes a 100% employer match on Day 1

What This Job Offers

• Job Type: Full-time
• Career Level: Senior