Senior .NET Applications Developer

Maricopa; Phoenix (AZ); Hybrid; USD 87,000 - 157,000; Full time

Benefits offered by this job

Tuition reimbursement

Hybrid work schedule

Career growth opportunities

Healthcare for you and dependents

Vacation and sick leave

Wellness program

State retirement system

Job summary

Maricopa County is seeking a Senior .NET Applications Developer to design, develop, and maintain scalable enterprise applications using the .NET stack. The role emphasizes security, architecture, and lifecycle management, with mentorship for junior staff.

You will collaborate across IT teams to deliver modern solutions, migrate legacy apps to current frameworks, and implement RESTful services and APIs in a hybrid work environment.

Qualifications

• Five+ years of enterprise .NET development experience.
• Bachelors in CS/IT/SE or equivalent; substitution allowed year-for-year.
• Strong understanding of SDLC, security, and ALM practices.

Responsibilities

• Provide technical leadership and mentorship to the development team.
• Design, develop, and maintain enterprise .NET applications and APIs.
• Lead deployments, upgrades, migrations, testing, and data conversions.
• Collaborate with IT Security, PMs, BAs, and stakeholders throughout lifecycle.
• Document specifications, architecture, procedures, and disaster recovery plans.
• Support modernization of legacy .NET apps to current versions; ensure security and scalability.

Skills

Project leadership

Communication skills

SDLC knowledge

Education

Bachelor's degree in CS/IT/SE or related

Tools

Visual Studio

SQL Server

HTML5

CSS

JavaScript/jQuery

Azure DevOps (ADO)

RESTful APIs

IIS

.NET / C#

Job description

Senior .NET Applications Developer# Maricopa County Careers## Senior .NET Applications DeveloperApply: 301 S 4th Ave, Phoenix, AZ 85003: Full time: Posted Today: End Date: October 28, 2026 (7 days left to apply): JR26512**Posting Date**10/20/26**Application Deadline**10/27/26**Pay Range**$87,000 - $156,500 annually Salary offers are based on the candidate's equivalent experience and internal equity with other employees within the same job classification. This position is not eligible for overtime compensation.**Job Type**Unclassified**Department**Enterprise Technology**About the Position**Enterprise Technology and Innovation is seeking a highly skilled Senior .NET Applications Developer who is passionate about building scalable, secure, and innovative enterprise applications using modern Microsoft technologies. This role will focus on designing, developing, and maintaining 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.**About Us**Are you looking for a career in a dynamic organization that embraces a can-do spirit? Look no further than Maricopa County’s Enterprise Technology & Innovation!We are a team that prides ourselves on leveraging technology to create digital transformations. We look for ways to bring about innovative solutions while providing top-notch customer service. Apply today and become part of the team that makes a lasting impact on the future of technology at Maricopa County. **Proud To Offer*** Work with a greater purpose* Tuition reimbursement* Exceptional work-life balance, with hybrid and alternative work schedules options available* 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 the 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 an 11.98% per paycheck contribution rate that includes a 100% employer match on Day 1* Want to learn more about the County’s Qualifying and Compensation Philosophy? Follow this link to learn more! Work With Us | Maricopa County, AZ **We Require*** Five (5) 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**We Also Value*** 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 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 **Job Contributions*** 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 **Working Conditions**The employee in this position typically works in an office or administrative environment and is not substantially exposed to adverse environmental conditions. The employee may be required to occasionally exert up to 10 pounds or frequently lift negligible amounts while performing work functions. This work is primarily sedentary.**Selection Procedure*** Consideration will only be given to candidates who submit online applications* Candidates will be contacted primarily through email and their Workday online application profile* Must pass a pre-employment background and/or fingerprint investigation as required by statute or policy, including drug and alcohol testing requirements for positions designated as safety-sensitiveMaricopa County is an equal opportunity employer and is committed to providing equal employment opportunities to all applicants. If you require a reasonable accommodation during the application process or to perform the essential functions of the position under the Americans with Disabilities Act (ADA), please contact [e-mail] to initiate the interactive process.