Senior ASP.NET Developer jobs in Phoenix, AZ

Tempe, Arizona

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20d ago

Vaco is partnering with a national wealth management technology organization to hire a Senior Software Engineer focused on backend .NET development, API design, and modernization of core platform applications. This role will be part of a new Tempe-based engineering team and will serve as one of the most senior individual contributors locally. The immediate focus is modernizing legacy applications, including rewriting older systems into modern .NET. This is a backend-heavy role centered on C#, .N

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Full-time

Depends on Experience

Senior Full Stack .NET Developer

Remote

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6d ago

HonorVet Technologies. We're a Service Disable Veteran-Owned IT staffing firm, ISO 9001 and ISO 27001 certified, working with federal agencies, state governments, and Fortune 500 enterprise clients across the US. What makes us different isn't a tagline; it's the way we work. We don't forward resumes and hope for the best. We take the time to understand where a professional like you is headed and only reach out when we genuinely believe there's a fit worth exploring. Job Title- Senior Full Stack

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Third Party, Contract

$55

Senior Full Stack .NET Developer - Remote

Remote or New York, New York

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Today

Job Role: Senior Full Stack .NET Developer Location: New York City, NY - Hybrid Duration: Long Term Project No C2C only W2 Job Summary: We are seeking an experienced Senior Full Stack .NET Developer to join our team in New York City. The ideal candidate will have strong full-stack development expertise with Angular 15+, C#/.NET, MS SQL Server, RESTful APIs, cloud platforms, and modern DevOps/CI/CD practices. Key Responsibilities: Design, develop, test, and maintain scalable full-stack web app

Contract

$DOE

Senior .NET Developer

Remote or Hybrid in Vienna, Virginia

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6d ago

ITCON Services is seeking a highly experienced Senior Developer for a contingent position to provide operations, maintenance, and modernization of system that includes 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, S

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Full-time

130,000 - 140,000

Senior Application Developer - New York City, NY

Remote or New York, New York

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Today

Job Role: Senior Application Developer Location: New York City, NY Duration: Long Term Contract Expecting 36 months We do C2C, W2 Project: M&O Services for DSS Application Systems Required Skills: C# ASP.NET Core MVC/Web API Angular 8+ TypeScript Entity Framework Core MS SQL AWS Jenkins/Octopus Azure DevOps Preferred Skills: Senior full-stack application developer for DSS application systems. Requires 8+ years of application development using Angular 8+, ASP.NET Core/MVC/Web API, C#, Entity

Contract, Third Party

$DOE

Senior Full Stack .Net Developer with AI Engineer - W2 Only

Remote

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4d ago

Title: Senior Full Stack .Net Developer with AI Engineer Location: Remote Overview We are seeking a Senior Full Stack AI Engineer to design, develop, and deploy modern cloud-based applications and AI-driven solutions. The ideal candidate will have strong expertise in .NET development, React, Azure cloud technologies, and production AI/ML deployments. Required Qualifications 6+ years of ASP.NET Core/C# development experience 6+ years of React.js development experience 6+ years of Azure cloud pl

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Contract

$50+

Sr .Net Developer

Remote

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13d ago

Must Haves: API Development experience, .Net core stack esponsibilities: Design, develop, and maintain high-quality, production-grade software solutions aligned with enterprise standards, using Microsoft .NET (Framework and .NET Core), C#, SQL Server, and integrated system components.Contribute across all phases of the software development lifecycle, ensuring adherence to documented processes, coding standards, and quality guidelines.Collaborate with cross-functional team members to design scala

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Full-time, Third Party

65 - 70

Senior Application Developer

Remote or Lynnfield, Massachusetts

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Today

Job Description Senior Application Developer About the Role We are seeking a highly skilled Senior Application Developer / Technical Lead to design, develop, support, and enhance enterprise web applications using modern Microsoft technologies. The ideal candidate will have strong experience with Angular, C#, .NET, IIS, Identity Management solutions, GitHub, Azure DevOps (ADO), and application security remediation practices. This role requires a hands-on technical leader who can collaborate ac

Full-time

USD 96,250.00 - 125,000.00 per year

IN-INDOT Senior .NET Application & Accessibility Consultant(s)

Remote

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Today

Senior .NET Application & Accessibility Consultant(s) Primary Location: Indianapolis, IN V-Soft Consulting is currently hiring a Senior .NET Application & Accessibility Consultant(s) for our premier client Indianapolis ,IN. Education and Experience Hands-on experience developing accessible PDF output using .NET PDF libraries with proper tag trees, alternative text, reading order, and table header Experience testing with tools like Claude AI, NVDA, and WAVE Hands-on expertise using GitHub Ent

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Contract, Third Party

Depends on Experience

Senior .NET Developer (Billing Platform)

Remote

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20d ago

Role OverviewContribute to development of a billing/claims platform supporting high-volume transactional systems Build and scale backend services and enterprise applications Improve and evolve existing systems and architecture Design scalable, maintainable, and extensible solutions Participate across the full SDLC, including design, development, testing, and deployment Collaborate cross-functionally to translate business requirements into technical solutions Ensure code quality through test auto

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Full-time

Depends on Experience

.NET Core Senior Software Engineer

Chandler, Arizona

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Today

Overview We are seeking a full-time .NET Core Senior Software Engineer in our Chandler, AZ location. In this role, you will be responsible for providing technical leadership and project planning for software development for Garmin's commercial aviation products as an individual contributor. Essential Functions Serves in a leadership capacity as an individual contributor for carrying out software development in C#/.NET Core framework and other selected languages for new products and/or applicati

Full-time

Application Developer - Senior

Remote

•

Today

Description Synergy Business Innovation & Solutions is a premier implementer of cutting-edge software solutions. Synergy brings the experience and expertise necessary to deliver capability that provides tangible ROI to our customers. Our core areas of expertise are in the fields of Digital Transformation, Cloud Solutions, SaaS and Low-Code/No-Code Solutions, Emerging Technologies, Data Analytics and Visualization, Information Assurance, and Business Process Re-Engineering. Synergy offers its e

Full-time

USD 100,000.00 - 120,000.00 per year

IT Application Development - Sr/Spec (ITAD-SS/ETS)

Remote or Olympia, Washington

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Today

Salary : $99,300.00 - $133,608.00 Annually Location : Thurston County - Olympia, WA Job Type: Full Time - Permanent Remote Employment: Remote Optional Job Number: 2026-07498 Department: Health Care Authority Division: ETS Opening Date: 09/09/2026 Closing Date: 9/23/2026 11:59 PM Pacific Salary Information: The high end of the salary range, Step M is typically a longevity step Description IT Application Development - Sr/Spec (ITAD-SS/ETS) 71115338 Help build the future of Washington's healthcare

Full-time

USD 99,300.00 - 133,608.00 per year

Senior .Net Developer (.NET, Node.js , Azure)

Remote

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5d ago

Job Title: Senior .Net Developer (.NET, Node.js , Azure) Location: REMOTE Duration: 6 Months Contract The ideal candidate has experience working in regulated, enterprise environments (such as healthcare), understands the importance of security, reliability, observability, and compliance, and can contribute at both a technical execution and solution design level. Key Responsibilities Application Development (Full Stack) Design, develop, and maintain full-stack applications using .NET (C#, ASP.NE

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Contract, Third Party

Depends on Experience

Senior .NET Accessibility Engineer

Remote

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Today

Senior .NET Accessibility Engineer Location: Indianapolis, IN Remote Duration: 7+ months, with potential to extend or convert to full-time Interview: Webcam JOB DESCRIPTION We are seeking a Senior .NET Accessibility Engineer with strong hands-on experience developing and modernizing enterprise C#/.NET applications while implementing WCAG 2.1/2.2 Level AA and Section 508 accessibility requirements. The role combines senior .NET / ASP.NET Core development, modern JavaScript, HTML5/CSS3, w

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Contract, Third Party

$55 - $60

.NET Developer Technical Lead

Remote

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20d ago

OverviewWe are looking for a hands-on Technical Lead and experienced .NET engineer to help lead the development of a newly formed Adherence Engineering Team. This team will design and build technology solutions that help medical practices improve patient vaccination adherence through targeted outreach and automation. Early pilot programs have already demonstrated strong results, showing over a 10% increase in vaccination rates when practices leverage patient outreach tools. This team will play a

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Full-time

Depends on Experience

Senior .NET Application & Accessibility Consultant

Remote

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Today

*Remote, only candidates currently located in Indiana will be considered.Senior Full-Stack .NET Developer Accessibility & AI ModernizationJob SummaryWe are seeking a highly skilled Senior Full-Stack .NET Developer with strong expertise in C#, .NET/.NET Core, JavaScript, Telerik UI, HTML5, and CSS3, along with hands-on experience in web accessibility, accessible PDF development, and modern DevOps practices. The candidate will be responsible for modernizing legacy enterprise applications, remedia

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Contract

Senior .NET Application & Accessibility Consultant

Remote

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Today

HIRING: Senior .NET Application & Accessibility Consultant Location: Indiana Local candidates only Experience: 78+ Years Must-Have Skills 7+ years of .NET Core / .NET 8+ years of Core, MVC/Razor/Web API & C# enterprise patterns Strong JavaScript ES6+, HTML5, CSS3, Flexbox, Grid, SCSS Expertise in WCAG 2.1/2.2 AA, WAI-ARIA & ADA Section 508 Experience with accessible PDF generation using .NET PDF libraries Knowledge of PDF tag trees, alternative text, reading order & table headers Hand

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Contract

Depends on Experience

Senior .NET Engineer-Puerto Rico Remote

Remote or San Juan, San Juan

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Today

Position:Senior .NET Engineer Experience:8+Years Work Mode:Puerto Rico Remote Contract: 12+Month We are Lokking for a Dot net Full stack Developer-Puerto Rico Remote Frontend Development Develop and maintain responsive, modular, and high-quality Angular applications. Implement UI components using TypeScript, HTML5, CSS\LESS\SCSS, and RxJS reactive patterns. Manage global and component-level state using NgRx. Write robust unit tests using Jest to ensure high code quality and maintainability

Full-time

Senior Backend .NET Software Engineer

Remote

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Today

Company Description Experian is a global data and technology company, powering opportunities for people and businesses around the world. We operate across a range of markets, from financial services to healthcare, automotive, agribusiness, insurance, and many more. Experian invests in people and new advanced technologies to unlock the power of data. We have an amazing team of 25,200 people in 32 countries. Job Description We help healthcare providers and insurers ensure accurate patient eligi

Full-time

USD 119,219.00 - 214,594.00 per year

Senior ASP.NET Developer jobs in Phoenix, AZ, USA