Senior ASP.NET Developer jobs in Seattle, WA

Senior .NET Developer (Remote & possible FTE conversion)

Remote

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Today

Job Description: Job Title: Senior .NET Developer Duration: 3+ Months Contract with Possibility of FT Conversion Job Location: Remote (Raleigh, NC preferred location preferred) Role Overview: The Developer, Specialist performs thorough end-to-end analysis of complex business functionality, provides technical solutions for complex business requirements, and implements enterprise-grade software solutions. This role functions as an individual contributor, capable of working independent

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Contract, Third Party

Depends on Experience

Senior Web Developer

Tacoma, Washington

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Today

Company Overview At ValidaTek, we modernize and optimize IT services to solve some of the most critical challenges facing federal civilian and defense agencies. From customers to partners to top-talent employees, ValidaTek puts people first, empowering them to exceed expectations and transform government organizations. Our employees are building purpose-driven careers, not just filling jobs. We bring together people with many different perspectives, experiences, and talents to drive innovation

Full-time

Senior .Net Developer

Remote

•

11d ago

The AOC information & Technology Services Department is seeking a contract resource for the role of Senior Developer - Development Team, who can assist a development team in developing new software, maintaining existing enterprise systems, troubleshooting complex application issues, and supporting the modernization of KCOJ software solutions. Requirements for candidates are described below. Additionally, to ensure scheduled interviews are productive and results-oriented, please refer to the atta

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Contract, Third Party

Depends on Experience

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: Flexible/Hybrid Job Number: 2026-05972 Department: Dept. of Labor & Industries Division: Information Technology - Applications & Data Management Opening Date: 07/28/2026 Closing Date: 8/11/2026 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

Full-time

USD 99,300.00 - 133,608.00 per year

Senior Software Developer

Remote

•

Today

ROLE: SENIOR SOFTWARE DEVELOPER (TESTER) REQUIRED: Active Public TrustRemoteFederal civilian agency experience IRS or Treasury experience preferred Experience supporting mission-critical production applications Experience operating in FISMA-regulated environments Experience with Agile, SDLC, and application lifecycle management processes Experience supporting production deployments and application maintenance Experience supporting application modernization and migration efforts Strong communica

Full-time

Senior Full Stack Developer (Remote)

Remote or Columbia, Maryland

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Today

At FEI Systems, we create innovative technology solutions to improve the delivery of health and human services because we know when cumbersome administrative processes stand in the way, those who need it most are often left without access to proper care and support. From comprehensive case management software to disaster recovery services and content management information systems used in delivering foreign aid, our solutions are improving the lives of millions of people. We're looking for a ful

Full-time

Developer, Senior Lead

Remote or Hybrid in Raleigh, North Carolina

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Today

The Developer, Specialist performs thorough end-to-end analysis of complex business functionality, provides technical solutions for complex business requirements, and implements enterprise-grade software solutions. This role functions as an individual contributor, capable of working independently and within teams, and serves as the technicalleadon development projects.Were looking for experience in: C# / .NET microservices REST API design JWT, OAuth, and API security AWS (API Gateway, IAM, ECS/E

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Full-time

Depends on Experience

Developer, Senior Lead Technical

Remote

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Today

*ACENTRA HEALTH* *Developer, Senior Lead Technical Job Description* Remote US EST Time zone work schedule (Candidates in Raleigh NC preferred but not required) Role Overview The Developer, Specialist performs thorough end-to-end analysis of complex business functionality, provides technical solutions for complex business requirements, and implements enterprise-grade software solutions. This role functions as an individual contributor, capable of working independently and within teams, and serve

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Full-time

Depends on Experience

Senior Developer

Remote

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Today

Senior Developer - Remote Primary Location: Remote Frankfort Kentucky V-Soft Consulting is currently hiring for a Senior Developer - Remote for our premier client Frankfort, Kentucky. Education and Experience Bachelors degree in computer science, Mathematics, or related field 5+ yrs. job experience or associate degree in computer science/information technology (related field) with 2+ yrs. job-related experience 2+ year experience configuring, implementing, and troubleshooting enterprise applic

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Contract

Depends on Experience

Mobile Enterprise Platform, Team Lead

Tacoma, Washington

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Today

At ValidaTek, we modernize and optimize IT services to solve some of the most critical challenges facing federal civilian and defense agencies. From customers to partners to top-talent employees, ValidaTek puts people first, empowering them to exceed expectations and transform government organizations. Our employees are building purpose-driven careers, not just filling jobs. We bring together people with many different perspectives, experiences, and talents to drive innovation and achieve more t

Full-time

Remote: Full Stack Developer, Senior

Remote

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Today

Job Description Precise Systems delivers integrated, mission-ready solutions that advance warfighter readiness and strengthen our nation's most critical defense programs. Through the power of our combined capabilities, we provide deep expertise in Advanced Engineering; Digital Transformation; Electromagnetic Warfare; Interactive Training & Simulation; Physical Sciences Research; Platform Lifecycle Support; and Foreign Military Sales. Unified by decades of trusted performance and expanded throug

Full-time

USD 120,000.00 - 145,000.00 per year

Lead Application Developer

Remote or Bethesda, Maryland

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Today

Analytica is seeking a Senior Developer / Task Lead to support a mission-critical, high-visibility federal government program. The ideal candidate will serve as a technical leader responsible for overseeing the design, development, and delivery of enterprise applications while ensuring alignment with federal compliance, performance, and security standards. This role combines hands-on development with leadership responsibilities across the full software development lifecycle. Analytica has been

Full-time

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 Technical Lead – C#/.NET | AWS | Microservices

Remote

•

Today

*ACENTRA HEALTH* *Developer, Senior Lead Technical Job Description* *Remote US EST Time zone work schedule (Candidates in Raleigh NC preferred but not required)* RATE : 60 ON W2 Role Overview The Developer, Specialist performs thorough end-to-end analysis of complex business functionality, provides technical solutions for complex business requirements, and implements enterprise-grade software solutions. This role functions as an individual contributor, capable of working independently and withi

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Full-time

Depends on Experience

Senior ASP.NET Developer jobs in Seattle, WA, USA