Senior ASP.NET Developer jobs in Phoenix, AZ

Tempe, Arizona

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6d 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 .NET Full Stack Developer - FHIR

Remote

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10d ago

Role: Senior .NET Full Stack Developer - FHIR Location: Remote Duration: 6+ months Job description: We are seeking a highly experienced Senior .NET Full Stack Developer with FHIR expertise to support a large-scale application modernization initiative. The ideal candidate will have strong hands-on experience in C#/.NET 8+, React, TypeScript, REST APIs, FHIR, microservices, Azure Cloud, and event-driven architecture. This is a hands-on technical leadership role involving modernization of le

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Contract

Depends on Experience

Senior Full Stack .NET Developer - California or Hawaii

Remote or Hybrid in Honolulu, Hawaii

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17d ago

Internal Position Title: Application Developer Come join our development team! We are a small, experienced and supportive team that enjoys solving challenging problems, reviewing ideas, sharing knowledge and building reliable solutions together. We value practical approaches, thoughtful technical discussions and an environment where everyone can contribute and continue developing professionally. We are looking for a hands-on Senior Full Stack .NET Developer to maintain and enhance business-crit

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Full-time

145000 - 160000

Senior Full Stack .NET Developer - California or Hawaii

Remote or Hybrid in Sacramento, California

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28d ago

Easy Apply

Full-time

145000 - 160000

Senior Full Stack .NET Developer

Remote

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Today

Job Title: Senior Full Stack .NET Developer Job Location: Remote Job Type: Full Time Job Description: Develop scalable web applications using .NET and ASP.NET Core. Build responsive frontend applications using React or Angular with TypeScript. Develop REST APIs and backend services using C#. Work with Entity Framework Core, SQL Server, and Azure SQL. Integrate applications with external APIs and enterprise systems. Implement authentication, authorization, logging, caching, and error handling.

Full-time

Senior Backend .NET Developer

Remote

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Today

Job Title: Senior Backend .NET Developer Job Location: Remote Job Type: Full Time Job Description: Develop backend services and REST APIs using C# and .NET. Build business and domain logic using SOLID and Clean Architecture principles. Work with Entity Framework Core, LINQ, SQL Server, and Azure SQL. Design integrations with enterprise and third-party systems. Implement asynchronous processing, background services, and messaging. Work with Azure Service Bus and other messaging technologies. I

Full-time

L&I IT Application Development - Senior/Specialist

Remote or Tumwater, Washington

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Today

Salary : $99,300.00 - $133,608.00 Annually Location : Thurston County - Tumwater, WA Job Type: Full Time - Permanent Remote Employment: Remote Optional Job Number: 2026-08592 Department: Dept. of Labor & Industries Division: Information Technology Opening Date: 10/23/2026 Closing Date: 11/8/2026 11:59 PM Pacific Salary Information: The high end of the salary range, Step M is typically a longevity step Description Our Mission: Keep Washington Safe and Working!Our Values: Customer Focus, One L&I,

Full-time

USD 99,300.00 - 133,608.00 per year

Sr. .NET Developer

Remote or McLean, Virginia

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Today

Public Trust Eligibility Required About Aretum Aretum is a mission-driven organization committed to delivering innovative, technology-enabled solutions to our customers across defense, civilian, and homeland security sectors. Our teams work at the intersection of strategy, technology, and transformation, helping agencies solve their most critical challenges. We believe in investing in our people and creating a culture where collaboration, inclusion, and professional growth are at the forefront

Full-time

USD 120,000.00 - 150,000.00 per year

Senior .NET Developer (Billing Platform)

Remote

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6d 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

Senior .NET Full Stack Engineer (Azure & Google Cloud Platform)

Remote

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6d ago

Senior .NET Full Stack Engineer (Azure & Google Cloud Platform) Remote | 12-Month Contract Location: Remote Duration: 12 months About the Role We re looking for a hands-on Senior Engineer to lead the design and delivery of cloud-native, AI-enabled enterprise applications. This is not a traditional .NET role: strong Azure and Google Cloud Platform engineering experience is required (AWS is not part of the environment). Key Responsibilities Lead development of enterprise applications across the fu

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Contract

Up to $65

Senior .NET Software Engineer

Remote

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Yesterday

Job Title: Senior .NET Software EngineerExperience: 6+ Years Mandatory Skills: .NET, C#, React, SQL Server Job DescriptionWe are looking for an experienced Senior .NET Software Engineer with strong expertise in .NET, C#, React, and SQL to develop, customize, implement, and support enterprise-level digital banking applications.The ideal candidate should have strong problem-solving skills, experience in client-facing technical roles, and the ability to deliver secure, scalable, and high-performan

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Full-time

Up to $135,000

.NET Developer Technical Lead

Remote

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6d 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

Easy Apply

Full-time

Depends on Experience

Senior .NET Developer / Cincinnati, OH/ Candidates - REMOTE

Remote or Cincinnati, Ohio

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Today

Greetings, We're seeking a Senior Full Stack Developer with strong backend expertise in .NET Core/.NET 8 and React.js on the frontend. Join a dynamic team building modern tech solutions for a leading financial and real estate client. Senior .NET Developer w/ React.js Application Developer Application Developer Cincinnati, OH - Hybrid Permanent IMPORTANT NOTE: This role requires the submission of a code exercise, which will take a senior developer 90 minutes (or longer) to complete. Please d

Full-time

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