Senior .NET Developer

Senior DeveloperITCON Services is seeking a highly experienced Senior Developer for a contingent position to provide operations, maintenance, and modernization of systems that include user forms, the entry, validation, certification, approval, and posting of data and centralized data warehouse to support reporting of program information.The Senior Developer will design, develop, enhance, deploy, and maintain Microsoft-based web applications, data integrations, databases, and reports using C#, ASP.NET/.NET, SQL Server, HTML, CSS, JavaScript, and related technologies. The role will provide hands-on technical application development, system architecture, database development, Azure infrastructure, configuration management, DevSecOps, automated testing, release management, troubleshooting, and technical documentation.The Senior Developer will play a key role in modernization by assessing legacy components, defining target-state architectures, decomposing and refactoring applications, modernizing data and reporting services, and supporting incremental migration to secure, scalable, cloud-based platforms. The role will develop application programming interfaces, reusable services, automated deployment capabilities, and data conversion solutions while ensuring continuity of mission operations, data integrity, interoperability, performance, accessibility, cybersecurity, and auditability throughout the transition.The candidate will complement business analysts, quality assurance engineers, database administrators, infrastructure teams, security personnel, help desk staff, and Federal stakeholders to implement change requests, resolve production issues, maintain data quality, and deliver reliable releases. The developer will participate in Agile ceremonies, requirements and design reviews, effort estimation, task decomposition, peer code reviews, unit and integration testing, User Acceptance Testing support, and post-release validation. This opening is for a full-time salaried contingent position supporting Federal civilian work performed off-site, with coordination across ITCON, client stakeholders, and Federal project teams as required. The applicant must be a United States citizen and be eligible to obtain and maintain a Public Trust clearance. Employment is contingent upon contract award, client approval, and completion of applicable background and onboarding requirements.Required Skills and QualificationsBachelor's degree in computer science, Information Systems, Software Engineering, or a related field10+ years of information technology experience, including 7+ years of hands-on software development experience5+ years of experience developing and maintaining enterprise Microsoft web applications using C#, ASP.NET/.NET Framework or.NET, HTML, CSS, JavaScript, and related librariesAdvanced experience with SQL Server, stored procedures, database objects, query optimization, data validation, troubleshooting, and production data supportExperience supporting data warehouse, extract-transform-load, reporting, and analytics solutions, including SSRS and Excel-compatible outputsExperience analyzing requirements, designing technical solutions, preparing estimates, decomposing user stories, and producing maintainable code that satisfies functional and nonfunctional requirementsExperience with Azure infrastructure and services, Windows Server environments, virtual machines, cloud migration, application configuration, monitoring, and operational supportHands-on experience with Azure DevOps or Team Foundation Server for source control, work-item management, build and release pipelines, branching, code reviews, and deployment traceabilityExperience building, maintaining, and troubleshooting continuous integration and continuous delivery pipelines and environment-specific release configurationsStrong understanding of the software development lifecycle, Agile/Scrum practices, configuration management, change control, release management, and Federal production deployment processesExperience implementing change requests, production database change requests, defect corrections, emergency fixes, and application enhancements across development, test, staging, and production environmentsExperience supporting application modernization programs, including legacy system assessment, target-state architecture, incremental refactoring, component decomposition, API and service development, data migration, cloud adoption, and retirement or transition of legacy capabilitiesAbility to collaborate with architects, product owners, security teams, data specialists, and operations personnel to develop modernization roadmaps, technical spikes, proofs of concept, transition plans, and implementation increments that limit operational riskExperience designing secure RESTful APIs, integration services, modular application components, and automated data conversion and reconciliation processes for modernized platformsExperience conducting peer code reviews, unit testing, integration testing, regression support, automated testing, and requirements traceability in partnership with business and quality assurance teamsExperience developing or maintaining Selenium and SQL automation scriptsExperience supporting authentication, authorization, role-based access control, least privilege, secure coding, logging, auditability, and Federal cybersecurity requirementsExperience supporting Section 508 accessibility compliance and remediating application accessibility defectsExperience with database backup and restore, capacity planning, patching, migration, performance analysis, business continuity, and disaster recovery coordinationExperience applying and validating operating system, database, middleware, and application patches while minimizing service disruptionExperience developing and maintaining system design documents, interface specifications, deployment procedures, installation guides, database diagrams, class diagrams, release notes, and operations documentationExperience providing Tier 2 and Tier 3 production support, including issue reproduction, log and data analysis, root-cause analysis, defect resolution, escalation, and resolution validationAbility to communicate complex technical concepts clearly to technical and nontechnical stakeholdersStrong written and oral communication skills, sound judgment, attention to detail, and ability to manage multiple high-visibility priorities independentlyDesired Skills and QualificationsExperience supporting systems with data-entry validation, certification, approval workflows, historical audit trails, and downstream financial or performance reportingExperience integrating with Federal identity services such as Login.gov and USDA eAuthenticationExperience supporting interfaces or data exchanges with enterprise data sourcesExperience managing SSRS reports, SharePoint document libraries, and technical repositoriesExperience with application modernization, cloud migration, refactoring, API development, and transition from legacy Microsoft technologiesKnowledge of NIST Risk Management Framework, secure software development practices, vulnerability remediation, and Federal information security controlsMicrosoft Azure,.NET, SQL Server, Agile, DevOps, or security-related certificationsExperience operating within CMMI-aligned and ISO-based quality, service management, or information security processesITCON Services is an equal opportunity employer. This position description summarizes the primary responsibilities and qualifications and may be adjusted based on final contract requirements.